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International Journal of Forest, Animal and Fisheries Research (IJFAF)
ISSN: 2456-8791
[Vol-7, Issue-3, May-Jun, 2023]
Issue DOI: https://dx.doi.org/10.22161/ijfaf.7.3
Article DOI: https://dx.doi.org/10.22161/ijfaf.7.3.4
Int. J. Forest Animal Fish. Res.
www.aipublications.com/ijfaf Page | 30
Comparison and Evaluation of Water Occupancy Rates
of the Kılıçkaya Dam Lake (Turkey) between 2010-
2021
Seher Dirican
Department of Crop and Animal Production, Sivas Technical Sciences Vocational School, Sivas Cumhuriyet University, Sivas,
Turkey
Received: 02 Feb 2023; Received in revised form: 23 Apr 2023; Accepted: 30 May 2023; Available online: 06 Jun 2023
©2023 The Author(s). Published by AI Publications. This is an open access article under the CC BY license
(https://creativecommons.org/licenses/by/4.0/)
Abstract— This study was carried out in Kılıçkaya Dam Lake in northeastern Turkey. Kılıçkaya Dam is a
dam built between 1980-1989 to generate energy on Kelkit Stream. With this study, the water occupancy
rates of Kılıçkaya Dam Lake, which has a proportionally large area, between the years 2010-2021 were
compared and evaluated. If a general conclusion is drawn for Kılıçkaya Dam Lake, it has been determined
that the water occupancy rates between the years 2010-2021 varied between 18.40 and 56.80 percent. The
slope line of the water occupancy rates obtained in this study is downward. The results showed that the
water occupancy rates in Kılıçkaya Dam Lake have a decreasing trend on an annual basis. When the
average of the water occupancy rates between 2010-2021 is evaluated, the water occupancy rate values in
Kılıçkaya Dam Lake indicate drought. The results obtained will be of great benefit to various users and
decision makers in terms of their future planning within the framework of a comprehensive and large-scale
drought management plan that is proposed to be prepared for the Kılıçkaya Dam Lake.
Keywords— Drought, Kılıçkaya Dam Lake, Turkey.
I. INTRODUCTION
Climate has direct and indirect effects on human life.
The climate has been constantly changing over
millions of years, and all living things are slowly
trying to adapt to this changing climate. Some
species have become extinct due to sudden changes
in climate change in history. In the last century,
climate change has been changing not by spreading
over hundreds of years, but by decades. Noticing this
change in the 1970s, human beings were worried
about the future. Climate change causes changes in
the proportions of the volumetric components of the
atmosphere as a result of human activities and an
increase in the greenhouse effect, which determines
the temperature of the world. Some of the rays
coming from the sun, which provides the heat energy
of the world, are absorbed by the atmosphere, some
remain on the earth and cause the greenhouse effect.
Considering the characteristics of greenhouse gases,
the greenhouse gas that has an important emission is
carbon dioxide. While the largest share of total
greenhouse gas emissions by activities is related to
energy consumption, agricultural activities take the
second place [1]. Human-induced increases in
greenhouse gas emissions cause global warming and
the climate changes accordingly. Climate change,
which has been felt more in recent years, must be
combated and urgent measures must be taken.
In Turkey, which is located in a semi-arid climate
zone, drought events are frequently seen depending
on atmospheric conditions, physical geography
factors and climatic conditions. The sudden decrease
Dirican International Journal of Forest, Animal and Fisheries Research (IJFAF)
7(3)-2023
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in precipitation that started in the Sahel Region of
Africa and in the sub-tropical belt in the 1960s began
to be effective in the Eastern Mediterranean Basin
and Turkey (especially in winter) with the 1970s.
Especially since the beginning of the 1970s, increases
in the areal spread, frequency and severity of
drought events have been observed in Turkey [2-7].
The fact that precipitation is below the long-term
averages in many regions of Turkey has led to new
meteorological drought events and subsequent
agricultural, hydrological and socio-economic
droughts. The most severe and widespread drought
events in Turkey occurred in 1932, 1955-1956, 1971-
1974, 1977, 1983-1984, 1989-1991, 1996, 1999-2001,
2007-2008 and 2013-2014 [7-10].
Dam lakes are artificial lakes built on streams for
purposes such as electricity generation, drinking
water supply, irrigation, fisheries, flood control, and
recreation. Considering its wide variety of
advantages, dam lakes have come to the forefront in
terms of energy production compared to thermal and
nuclear power plants, and due to the presence of
stream sources, nearly 800 dams have been built in
Turkey. Dam lakes are defined as "stream-lake
hybrids" as they maintain the characteristics of the
rivers on which they are built, and at the same time,
they are structures that have the characteristics of the
stagnant water mass formed. The wider the
catchment basins, the more they are affected by
pollution and climate change in the basin [11]. In
recent years, the protection and monitoring of water
resources is one of the most important issues for
states.
There are 861 dam lakes in operation in Turkey. The
climate of Turkey is semi-arid. Due to the fact that
Turkey is surrounded by seas on three sides, high
mountain ranges stretch along the coasts, the
elevation increases from west to east, and the
distance to the coast, temperature, precipitation and
winds in Turkey vary according to the region and
time. Turkey's long-term precipitation average is 574
mm annually, corresponding to an average of 450
billion cubic meters of water per year. The Eastern
Black Sea Region is the place with the highest rainfall
(1200-2500 mm/year). On the other hand, the Central
Anatolia Region is the place that receives the least
rainfall (250-300 mm/year). Apart from the coastal
settlements of the Mediterranean and Southern
Aegean Regions of Turkey, snowfall is observed in
the winter months. Within the framework of today's
technical and economic conditions, the surface water
potential that can be consumed for various purposes
is an average of 94 billion cubic meters per year.
Together with the groundwater potential determined
as 18 billion cubic meters, the consumable surface
and underground water potential of Turkey is 112
billion cubic meters per year, 57 billion cubic meters
of which is used. The annual amount of usable water
per capita in Turkey was 1652 cubic meters in 2000,
1544 cubic meters in 2009, and 1346 cubic meters in
2020. Considering the usable water potential per
capita, Turkey is among the countries experiencing
water pressure [12]. For these reasons, it is of great
importance to use water economically and optimally.
Kılıçkaya Dam Lake Basin, located in the Yeşilırmak
River Basin, has a catchment area of approximately
8146 square kilometers. Kılıçkaya Dam Lake Basin,
which has a very rough terrain, is located on the
mountains extending in the east-west direction and
on the fragmented depression areas with faults in the
south of the Eastern Black Sea Mountains. Kılıçkaya
Dam Lake Basin has a completely mountainous and
rough terrain and is surrounded by mountains. In
addition, elevation differences in the basin vary in
short distances. In the Kılıçkaya Dam Lake Basin,
although the temperature has decreased as a result of
the increase in continentality compared to the Black
Sea coast, a fully continental climate is not
experienced. Precipitation shifts to spring and
summer drought becomes evident. In addition, the
number of snowfall and snow-covered days’
increases in the winter season. A transitional climate
from the Eastern Black Sea climate to the continental
climate is dominant in the Kılıçkaya Dam Lake Basin.
For this reason, summer months are generally hot
and dry, and winter and spring months are rainy [7,
13]. According to Katipoglu et al. [14], it has been
determined that increasing hydrological drought
trends are dominant in the Yeşilırmak River Basin,
where Kılıçkaya Dam Lake is located, in monthly and
annual time periods.
With the completion of the construction of Kılıçkaya
Dam Lake in 1989, the potential of Kelkit Stream was
evaluated and it was possible to use it for multiple
purposes. In this study, the water occupancy rates of
the Kılıçkaya Dam Lake, which has a proportionally
Dirican International Journal of Forest, Animal and Fisheries Research (IJFAF)
7(3)-2023
www.aipublications.com Page | 32
large area, between the years 2010-2021 were
examined.
II. MATERIALS AND METHODS
Kılıçkaya Dam Lake, chosen as the research area, is
located on the 320 kilometers long Kelkit Stream,
which is one of the important branches of the
Yeşilırmak River. Kılıçkaya Dam is located about 130
kilometers from Sivas city center. Kılıçkaya Dam
Lake is located 25 kilometers from the town of
Suşehri. The district is located at the intersection of
380 05' 45" East longitude and 400 09' 45" North
latitude. Some technical specifications of Kılıçkaya
Dam Lake are presented in Table 1. Kılıçkaya Dam is
located on the Kelkit Stream in the Türkmenler
village of the Suşehri district of Sivas province.
Kılıçkaya Dam construction was completed on
November 15, 1989. The height of the dam built with
rock filling type is 134 meters from the river bed. At
the normal water level of Kılıçkaya Dam, the lake
volume and lake area are 1400390000 m³ and 64.42
km², respectively. The maximum depth of the
Kılıçkaya Dam Lake is around 100 meters. Kılıçkaya
Hydroelectric Power Plant produces 332 GWh of
energy per year with 124 MW of power [15].
According to the monthly average temperature data
obtained from the State Meteorology Directorate in
Turkey, the annual average temperature in the
Kılıçkaya Dam Lake Basin is 10 ºC. The hottest
months are July and August, and the coldest months
are January and February. Total annual precipitation
in the Kılıçkaya Dam Lake Basin also differs from
year to year. Considering the entire Kılıçkaya Dam
Lake Basin, the annual average precipitation is
around 489 mm. This amount corresponds to a value
below the annual average precipitation amount in
Turkey. According to the precipitation data of long
years, the highest precipitation in the basin is
observed in April and May in the spring season, and
the least precipitation is observed in July and August
in the summer season. It has been observed that the
rainiest season after the spring season is the winter
season. The monthly average inflow to Kılıçkaya
Dam Lake is approximately 61.16 m3/second, the
maximum monthly average inflow amount is 358.56
m3/second and the minimum monthly average
inflow amount is 1.8 m3/second [7].
Table 1: Some technical specifications of the Kılıçkaya
Dam Lake.
Technicial
Specifications
Kılıçkaya Dam Lake
Date of Construction
Start
13.11.1980
Date of Construction
End
15.11.1989
Purpose of the Dam Energy
Stream Kelkit Stream
Body Fill Type Rock
Height 134.00 m
Lake Volume 1400.39 hm3
Lake Area 64.42 km2
In this study, the values of the water occupancy rate
data between 2010 and 2021 for the Kılıçkaya Dam
Lake belonging to the General Directorate of State
Hydraulic Works in Turkey were used. The
occupancy rate calculations were determined
according to the ratio of the active dam volume to the
total dam volume. The occupancy rate values of
Kılıçkaya Dam Lake are expressed as a percentage
(%).
III. RESULTS AND DISCUSSION
Changes in the annual average water occupancy
rates of Kılıçkaya Dam Lake between 2010 and 2021
are presented in Figure 1. When the water occupancy
rates of Kılıçkaya Dam Lake are compared, a
fluctuation trend has been observed from 2010 to
2021. The water occupancy rate for 2010 was
determined as 22.72 percent. In 2011, 2012 and 2 013,
the water occupancy rate increased to 32.27, 49.10
and 53.90 percent, respectively. In 2014, the water
occupancy rate decreased to 29.50 percent. In 2015
and 2016, the water occupancy rate increased again
to 54.00 percent and 56.80 percent, respectively. In
2017, 2018 and 2019, the water occupancy rate
decreased again to 48.80, 40.80 and 24.20 percent,
respectively. In 2020, the water occupancy rate
increased to 35.80 percent. In 2021, the water
occupancy rate decreased to 18.40 percent (Figure 1).
The highest occupancy rate level was found to be
56.80 percent in 2016 and the lowest occupancy rate
Dirican International Journal of Forest, Animal and Fisheries Research (IJFAF)
7(3)-2023
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level in 2021 was 18.40 percent for Kılıçkaya Dam
Lake. The average of the annual water occupancy
rates of the Kılıçkaya Dam Lake for the period
between 2010-2021 was calculated as percent 38.86
and its standard deviation as ±13.55. These figures
indicate that approximately 60 percent of the
Kılıçkaya Dam Lake was empty in the 2010-2021
period, that is, it was not filled. Accordingly, it is
seen that the water occupancy rates of Kılıçkaya Dam
Lake are at low levels. The slope line given in Figure
1 also confirms this decrease. This indicates that the
water level in Kılıçkaya Dam Lake decreased
significantly in the 2010-2021 period due to the effect
of drought.
Fig. 1: Change in water occupancy rates of Kılıçkaya Dam
Lake between 2010-2021.
In the studies carried out in Çermikler, Gazibey,
Gölova, Maksutlu ve Karacalar dam lakes in Sivas
province, a downtrend was detected in water
occupancy rates similar to Kılıçkaya Dam Lake [16-
20].
Kılıçkaya Dam Lake has first class water quality and
its annual average nitrate value varies between 1.9-
2.8 mg/L [21]. According to TWPCR [22], the water
of Kılıçkaya Dam Lake, which has first class water
quality, can be disinfected and used not only for
drinking purposes, but also for recreational
purposes, rainbow trout farming, animal production
and other purposes. For these reasons, Kılıçkaya
Dam Lake is an important water source for Turkey
and its region.
With the effect of drought and lack of precipitation,
significant recessions in water level are observed in
Kılıçkaya Dam Lake with the decrease in water
occupancy rates. In 2021, the lowest water occupancy
rate was determined as 18.40 from Kılıçkaya Dam
Lake (Figure 1). In the Kılıçkaya Dam Lake, which is
located in the Suşehri district of Sivas province,
drought was observed in the summer months of
2021, which occurred with the withdrawal of water.
It has been observed that only the bed of the Kelkit
Stream, which forms and feeds the dam, remains
from the Kılıçkaya Dam Lake, which once resembled
the sea. It is predicted that the decrease in
precipitation caused by climate change and the
increase in temperatures will increase the
evaporation effect, severity and duration of Kılıçkaya
Dam Lake, and accordingly, the decrease in water
occupancy rates will be more in the future.
The fact that the precipitation in Turkey was below
normal in all regions in 2021 caused the hydrological
drought effect and a decrease in the share of
hydroelectric energy production in total electricity
production. Hydroelectric energy production, which
was 88,879 GWh in 2019, decreased by 12.5% to
78,095 GWh in 2020. This decline continued in 2021
as well. In the first 5 months of 2021 in Turkey, there
have been dramatic decreases in the amount of water
coming to hydroelectric power plants, which are
water-dependent electricity generation sources,
compared to the long-term average. As the amount
of water coming to the main watershed dams
generating electricity in Turkey remained below the
long-term average of 66 percent in the first 5 months
of 2021, its share in electricity generation decreased
from 31 percent to 23 percent as of May 2021.
Similarly, while 49.1 billion cubic meters of water
came to the dams on average in the first 5 months,
the water remained at 24.3 billion cubic meters in the
first 5 months of 2021. In short, the water coming to
the energy-producing dams in the first 5 months was
not even half of the average incoming water for
many years in 2021. The incoming water in May 2021
is 54.1 percent less than the incoming water in the
same month of 2020; As of the end of May 2021, the
water incoming in the 5-month period was 38.9
percent less than the water incoming in the same
period of 2020 [23]. The flow rate in all of the rivers in
Turkey has decreased between 20 and 70 percent.
Kelkit Stream feeding the Kılıçkaya Dam Lake has
also taken its share from this situation.
The decrease in the water coming to the hydroelectric
power plants seems to disrupt the electricity
production balance. As of April 2021, the first 3
sources in the electricity generation of licensed power
plants are hydroelectric energy with 31.10 percent;
Dirican International Journal of Forest, Animal and Fisheries Research (IJFAF)
7(3)-2023
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While coal with 28.48 percent and natural gas with
21.59 percent, there were drastic changes in these
rates in May. In May, the first 3 sources in electricity
generation by licensed power plants are coal with
29.70 percent; natural gas with 27.62 percent;
Hydroelectric energy was 23.25 percent. In years
with normal or abundant water income, the share of
hydroelectric power plants in electricity generation
would reach 40-45 percent, especially in spring.
However, in May 2021, the share of hydroelectric
power plants remained below 25 percent [23].
Accordingly, the drought has also negatively affected
the electricity production of Kılıçkaya Dam Lake.
Despite the decrease in the water in the dams,
especially in the spring and summer months, Turkey
needs to increase the share of renewable resources
such as solar and wind, which are domestic
sustainable resources, in the portfolio in order to
compensate for the increased electricity
consumption. Hydroelectric power plants should be
supported in the dry years like 2021. Against the risk
of the drought continuing in the coming years,
resource planning should be done in energy. For this
reason, it would be very beneficial for energy
management to make a production and energy
supply planning that takes into account possible
hydrological drought, as well as water management.
The drought, which has taken the world and Turkey
under its influence, also shows itself in Kılıçkaya
Dam Lake. Long-term droughts were observed in the
Kılıçkaya Dam Lake Basin in 1954-1959, 1969-1970,
1972-1975, 1989-1990, 1993-1994, 2000-2002, 2007-2008
and 2012-2013 periods [7]. According to Katipoğlu et
al. [14] determined as a result of trend analysis that
droughts tend to increase in the Yeşilırmak River
Basin, where Kılıçkaya Dam Lake is located.
However, the drought, which started with the
decrease in precipitation and climate changes, has
been increasing day by day in recent years and is
progressing in Kılıçkaya Dam Lake. Global climate
change and drought caused by the decrease in
precipitation cause significant decreases in water
level in Kılıçkaya Dam Lake. As a result of the global
climate change, which has been more effective since
2016, and the drought caused by the decrease in
precipitation in Kılıçkaya Dam Lake, the water level
continues to decrease in the Kelkit Stream feeding the
Kılıçkaya Dam Lake and in the creeks. After 2016, the
water level in Kılıçkaya Dam Lake has been
decreasing every year (Figure 1). Kelkit Stream has
shrunk due to drought. Due to the decrease in water
levels in Kılıçkaya Dam Lake, especially fishermen
have suffered a lot in recent years. With the marked
decrease in the water occupancy rates of Kılıçkaya
Dam Lake in recent years, many areas, especially
fisheries and energy, are adversely affected.
IV. CONCLUSION
While 2016 was the year with the highest occupancy
rate in Kılıçkaya Dam Lake, the year with the lowest
occupancy rate was found in 2021. If a general
conclusion is drawn for Kılıçkaya Dam Lake, it has
been observed that the water occupancy rates varied
between 18.40 and 56.80 percent between 2010-2021.
The data show that there are extreme decreases in
water occupancy rates in Kılıçkaya Dam Lake. The
results support that, as a result of the decrease in
precipitation due to global climate change, the
decreases in the water occupancy rates of Kılıçkaya
Dam Lake will be greater with the future occurrence
and severity of drought. All these show that the
effects of drought in Kılıçkaya Dam Lake may be felt
even more in the future. According to the results
obtained, it is recommended to create a
comprehensive and large-scale drought management
plan for Kılıçkaya Dam Lake. Accordingly, drought
risks should be managed and measures to be taken
against drought should be implemented in an
integrated manner in Kılıçkaya Dam Lake.
ACKNOWLEDGEMENTS
The author would like to thank the General
Directorate of State Hydraulic Works in Turkey for
their support in sharing the water occupancy rate
data used within the scope of the study.
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Comparison and Evaluation of Water Occupancy Rates of the Kılıçkaya Dam Lake (Turkey) between 2010-2021

  • 1. International Journal of Forest, Animal and Fisheries Research (IJFAF) ISSN: 2456-8791 [Vol-7, Issue-3, May-Jun, 2023] Issue DOI: https://dx.doi.org/10.22161/ijfaf.7.3 Article DOI: https://dx.doi.org/10.22161/ijfaf.7.3.4 Int. J. Forest Animal Fish. Res. www.aipublications.com/ijfaf Page | 30 Comparison and Evaluation of Water Occupancy Rates of the Kılıçkaya Dam Lake (Turkey) between 2010- 2021 Seher Dirican Department of Crop and Animal Production, Sivas Technical Sciences Vocational School, Sivas Cumhuriyet University, Sivas, Turkey Received: 02 Feb 2023; Received in revised form: 23 Apr 2023; Accepted: 30 May 2023; Available online: 06 Jun 2023 ©2023 The Author(s). Published by AI Publications. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/) Abstract— This study was carried out in Kılıçkaya Dam Lake in northeastern Turkey. Kılıçkaya Dam is a dam built between 1980-1989 to generate energy on Kelkit Stream. With this study, the water occupancy rates of Kılıçkaya Dam Lake, which has a proportionally large area, between the years 2010-2021 were compared and evaluated. If a general conclusion is drawn for Kılıçkaya Dam Lake, it has been determined that the water occupancy rates between the years 2010-2021 varied between 18.40 and 56.80 percent. The slope line of the water occupancy rates obtained in this study is downward. The results showed that the water occupancy rates in Kılıçkaya Dam Lake have a decreasing trend on an annual basis. When the average of the water occupancy rates between 2010-2021 is evaluated, the water occupancy rate values in Kılıçkaya Dam Lake indicate drought. The results obtained will be of great benefit to various users and decision makers in terms of their future planning within the framework of a comprehensive and large-scale drought management plan that is proposed to be prepared for the Kılıçkaya Dam Lake. Keywords— Drought, Kılıçkaya Dam Lake, Turkey. I. INTRODUCTION Climate has direct and indirect effects on human life. The climate has been constantly changing over millions of years, and all living things are slowly trying to adapt to this changing climate. Some species have become extinct due to sudden changes in climate change in history. In the last century, climate change has been changing not by spreading over hundreds of years, but by decades. Noticing this change in the 1970s, human beings were worried about the future. Climate change causes changes in the proportions of the volumetric components of the atmosphere as a result of human activities and an increase in the greenhouse effect, which determines the temperature of the world. Some of the rays coming from the sun, which provides the heat energy of the world, are absorbed by the atmosphere, some remain on the earth and cause the greenhouse effect. Considering the characteristics of greenhouse gases, the greenhouse gas that has an important emission is carbon dioxide. While the largest share of total greenhouse gas emissions by activities is related to energy consumption, agricultural activities take the second place [1]. Human-induced increases in greenhouse gas emissions cause global warming and the climate changes accordingly. Climate change, which has been felt more in recent years, must be combated and urgent measures must be taken. In Turkey, which is located in a semi-arid climate zone, drought events are frequently seen depending on atmospheric conditions, physical geography factors and climatic conditions. The sudden decrease
  • 2. Dirican International Journal of Forest, Animal and Fisheries Research (IJFAF) 7(3)-2023 www.aipublications.com Page | 31 in precipitation that started in the Sahel Region of Africa and in the sub-tropical belt in the 1960s began to be effective in the Eastern Mediterranean Basin and Turkey (especially in winter) with the 1970s. Especially since the beginning of the 1970s, increases in the areal spread, frequency and severity of drought events have been observed in Turkey [2-7]. The fact that precipitation is below the long-term averages in many regions of Turkey has led to new meteorological drought events and subsequent agricultural, hydrological and socio-economic droughts. The most severe and widespread drought events in Turkey occurred in 1932, 1955-1956, 1971- 1974, 1977, 1983-1984, 1989-1991, 1996, 1999-2001, 2007-2008 and 2013-2014 [7-10]. Dam lakes are artificial lakes built on streams for purposes such as electricity generation, drinking water supply, irrigation, fisheries, flood control, and recreation. Considering its wide variety of advantages, dam lakes have come to the forefront in terms of energy production compared to thermal and nuclear power plants, and due to the presence of stream sources, nearly 800 dams have been built in Turkey. Dam lakes are defined as "stream-lake hybrids" as they maintain the characteristics of the rivers on which they are built, and at the same time, they are structures that have the characteristics of the stagnant water mass formed. The wider the catchment basins, the more they are affected by pollution and climate change in the basin [11]. In recent years, the protection and monitoring of water resources is one of the most important issues for states. There are 861 dam lakes in operation in Turkey. The climate of Turkey is semi-arid. Due to the fact that Turkey is surrounded by seas on three sides, high mountain ranges stretch along the coasts, the elevation increases from west to east, and the distance to the coast, temperature, precipitation and winds in Turkey vary according to the region and time. Turkey's long-term precipitation average is 574 mm annually, corresponding to an average of 450 billion cubic meters of water per year. The Eastern Black Sea Region is the place with the highest rainfall (1200-2500 mm/year). On the other hand, the Central Anatolia Region is the place that receives the least rainfall (250-300 mm/year). Apart from the coastal settlements of the Mediterranean and Southern Aegean Regions of Turkey, snowfall is observed in the winter months. Within the framework of today's technical and economic conditions, the surface water potential that can be consumed for various purposes is an average of 94 billion cubic meters per year. Together with the groundwater potential determined as 18 billion cubic meters, the consumable surface and underground water potential of Turkey is 112 billion cubic meters per year, 57 billion cubic meters of which is used. The annual amount of usable water per capita in Turkey was 1652 cubic meters in 2000, 1544 cubic meters in 2009, and 1346 cubic meters in 2020. Considering the usable water potential per capita, Turkey is among the countries experiencing water pressure [12]. For these reasons, it is of great importance to use water economically and optimally. Kılıçkaya Dam Lake Basin, located in the Yeşilırmak River Basin, has a catchment area of approximately 8146 square kilometers. Kılıçkaya Dam Lake Basin, which has a very rough terrain, is located on the mountains extending in the east-west direction and on the fragmented depression areas with faults in the south of the Eastern Black Sea Mountains. Kılıçkaya Dam Lake Basin has a completely mountainous and rough terrain and is surrounded by mountains. In addition, elevation differences in the basin vary in short distances. In the Kılıçkaya Dam Lake Basin, although the temperature has decreased as a result of the increase in continentality compared to the Black Sea coast, a fully continental climate is not experienced. Precipitation shifts to spring and summer drought becomes evident. In addition, the number of snowfall and snow-covered days’ increases in the winter season. A transitional climate from the Eastern Black Sea climate to the continental climate is dominant in the Kılıçkaya Dam Lake Basin. For this reason, summer months are generally hot and dry, and winter and spring months are rainy [7, 13]. According to Katipoglu et al. [14], it has been determined that increasing hydrological drought trends are dominant in the Yeşilırmak River Basin, where Kılıçkaya Dam Lake is located, in monthly and annual time periods. With the completion of the construction of Kılıçkaya Dam Lake in 1989, the potential of Kelkit Stream was evaluated and it was possible to use it for multiple purposes. In this study, the water occupancy rates of the Kılıçkaya Dam Lake, which has a proportionally
  • 3. Dirican International Journal of Forest, Animal and Fisheries Research (IJFAF) 7(3)-2023 www.aipublications.com Page | 32 large area, between the years 2010-2021 were examined. II. MATERIALS AND METHODS Kılıçkaya Dam Lake, chosen as the research area, is located on the 320 kilometers long Kelkit Stream, which is one of the important branches of the Yeşilırmak River. Kılıçkaya Dam is located about 130 kilometers from Sivas city center. Kılıçkaya Dam Lake is located 25 kilometers from the town of Suşehri. The district is located at the intersection of 380 05' 45" East longitude and 400 09' 45" North latitude. Some technical specifications of Kılıçkaya Dam Lake are presented in Table 1. Kılıçkaya Dam is located on the Kelkit Stream in the Türkmenler village of the Suşehri district of Sivas province. Kılıçkaya Dam construction was completed on November 15, 1989. The height of the dam built with rock filling type is 134 meters from the river bed. At the normal water level of Kılıçkaya Dam, the lake volume and lake area are 1400390000 m³ and 64.42 km², respectively. The maximum depth of the Kılıçkaya Dam Lake is around 100 meters. Kılıçkaya Hydroelectric Power Plant produces 332 GWh of energy per year with 124 MW of power [15]. According to the monthly average temperature data obtained from the State Meteorology Directorate in Turkey, the annual average temperature in the Kılıçkaya Dam Lake Basin is 10 ºC. The hottest months are July and August, and the coldest months are January and February. Total annual precipitation in the Kılıçkaya Dam Lake Basin also differs from year to year. Considering the entire Kılıçkaya Dam Lake Basin, the annual average precipitation is around 489 mm. This amount corresponds to a value below the annual average precipitation amount in Turkey. According to the precipitation data of long years, the highest precipitation in the basin is observed in April and May in the spring season, and the least precipitation is observed in July and August in the summer season. It has been observed that the rainiest season after the spring season is the winter season. The monthly average inflow to Kılıçkaya Dam Lake is approximately 61.16 m3/second, the maximum monthly average inflow amount is 358.56 m3/second and the minimum monthly average inflow amount is 1.8 m3/second [7]. Table 1: Some technical specifications of the Kılıçkaya Dam Lake. Technicial Specifications Kılıçkaya Dam Lake Date of Construction Start 13.11.1980 Date of Construction End 15.11.1989 Purpose of the Dam Energy Stream Kelkit Stream Body Fill Type Rock Height 134.00 m Lake Volume 1400.39 hm3 Lake Area 64.42 km2 In this study, the values of the water occupancy rate data between 2010 and 2021 for the Kılıçkaya Dam Lake belonging to the General Directorate of State Hydraulic Works in Turkey were used. The occupancy rate calculations were determined according to the ratio of the active dam volume to the total dam volume. The occupancy rate values of Kılıçkaya Dam Lake are expressed as a percentage (%). III. RESULTS AND DISCUSSION Changes in the annual average water occupancy rates of Kılıçkaya Dam Lake between 2010 and 2021 are presented in Figure 1. When the water occupancy rates of Kılıçkaya Dam Lake are compared, a fluctuation trend has been observed from 2010 to 2021. The water occupancy rate for 2010 was determined as 22.72 percent. In 2011, 2012 and 2 013, the water occupancy rate increased to 32.27, 49.10 and 53.90 percent, respectively. In 2014, the water occupancy rate decreased to 29.50 percent. In 2015 and 2016, the water occupancy rate increased again to 54.00 percent and 56.80 percent, respectively. In 2017, 2018 and 2019, the water occupancy rate decreased again to 48.80, 40.80 and 24.20 percent, respectively. In 2020, the water occupancy rate increased to 35.80 percent. In 2021, the water occupancy rate decreased to 18.40 percent (Figure 1). The highest occupancy rate level was found to be 56.80 percent in 2016 and the lowest occupancy rate
  • 4. Dirican International Journal of Forest, Animal and Fisheries Research (IJFAF) 7(3)-2023 www.aipublications.com Page | 33 level in 2021 was 18.40 percent for Kılıçkaya Dam Lake. The average of the annual water occupancy rates of the Kılıçkaya Dam Lake for the period between 2010-2021 was calculated as percent 38.86 and its standard deviation as ±13.55. These figures indicate that approximately 60 percent of the Kılıçkaya Dam Lake was empty in the 2010-2021 period, that is, it was not filled. Accordingly, it is seen that the water occupancy rates of Kılıçkaya Dam Lake are at low levels. The slope line given in Figure 1 also confirms this decrease. This indicates that the water level in Kılıçkaya Dam Lake decreased significantly in the 2010-2021 period due to the effect of drought. Fig. 1: Change in water occupancy rates of Kılıçkaya Dam Lake between 2010-2021. In the studies carried out in Çermikler, Gazibey, Gölova, Maksutlu ve Karacalar dam lakes in Sivas province, a downtrend was detected in water occupancy rates similar to Kılıçkaya Dam Lake [16- 20]. Kılıçkaya Dam Lake has first class water quality and its annual average nitrate value varies between 1.9- 2.8 mg/L [21]. According to TWPCR [22], the water of Kılıçkaya Dam Lake, which has first class water quality, can be disinfected and used not only for drinking purposes, but also for recreational purposes, rainbow trout farming, animal production and other purposes. For these reasons, Kılıçkaya Dam Lake is an important water source for Turkey and its region. With the effect of drought and lack of precipitation, significant recessions in water level are observed in Kılıçkaya Dam Lake with the decrease in water occupancy rates. In 2021, the lowest water occupancy rate was determined as 18.40 from Kılıçkaya Dam Lake (Figure 1). In the Kılıçkaya Dam Lake, which is located in the Suşehri district of Sivas province, drought was observed in the summer months of 2021, which occurred with the withdrawal of water. It has been observed that only the bed of the Kelkit Stream, which forms and feeds the dam, remains from the Kılıçkaya Dam Lake, which once resembled the sea. It is predicted that the decrease in precipitation caused by climate change and the increase in temperatures will increase the evaporation effect, severity and duration of Kılıçkaya Dam Lake, and accordingly, the decrease in water occupancy rates will be more in the future. The fact that the precipitation in Turkey was below normal in all regions in 2021 caused the hydrological drought effect and a decrease in the share of hydroelectric energy production in total electricity production. Hydroelectric energy production, which was 88,879 GWh in 2019, decreased by 12.5% to 78,095 GWh in 2020. This decline continued in 2021 as well. In the first 5 months of 2021 in Turkey, there have been dramatic decreases in the amount of water coming to hydroelectric power plants, which are water-dependent electricity generation sources, compared to the long-term average. As the amount of water coming to the main watershed dams generating electricity in Turkey remained below the long-term average of 66 percent in the first 5 months of 2021, its share in electricity generation decreased from 31 percent to 23 percent as of May 2021. Similarly, while 49.1 billion cubic meters of water came to the dams on average in the first 5 months, the water remained at 24.3 billion cubic meters in the first 5 months of 2021. In short, the water coming to the energy-producing dams in the first 5 months was not even half of the average incoming water for many years in 2021. The incoming water in May 2021 is 54.1 percent less than the incoming water in the same month of 2020; As of the end of May 2021, the water incoming in the 5-month period was 38.9 percent less than the water incoming in the same period of 2020 [23]. The flow rate in all of the rivers in Turkey has decreased between 20 and 70 percent. Kelkit Stream feeding the Kılıçkaya Dam Lake has also taken its share from this situation. The decrease in the water coming to the hydroelectric power plants seems to disrupt the electricity production balance. As of April 2021, the first 3 sources in the electricity generation of licensed power plants are hydroelectric energy with 31.10 percent;
  • 5. Dirican International Journal of Forest, Animal and Fisheries Research (IJFAF) 7(3)-2023 www.aipublications.com Page | 34 While coal with 28.48 percent and natural gas with 21.59 percent, there were drastic changes in these rates in May. In May, the first 3 sources in electricity generation by licensed power plants are coal with 29.70 percent; natural gas with 27.62 percent; Hydroelectric energy was 23.25 percent. In years with normal or abundant water income, the share of hydroelectric power plants in electricity generation would reach 40-45 percent, especially in spring. However, in May 2021, the share of hydroelectric power plants remained below 25 percent [23]. Accordingly, the drought has also negatively affected the electricity production of Kılıçkaya Dam Lake. Despite the decrease in the water in the dams, especially in the spring and summer months, Turkey needs to increase the share of renewable resources such as solar and wind, which are domestic sustainable resources, in the portfolio in order to compensate for the increased electricity consumption. Hydroelectric power plants should be supported in the dry years like 2021. Against the risk of the drought continuing in the coming years, resource planning should be done in energy. For this reason, it would be very beneficial for energy management to make a production and energy supply planning that takes into account possible hydrological drought, as well as water management. The drought, which has taken the world and Turkey under its influence, also shows itself in Kılıçkaya Dam Lake. Long-term droughts were observed in the Kılıçkaya Dam Lake Basin in 1954-1959, 1969-1970, 1972-1975, 1989-1990, 1993-1994, 2000-2002, 2007-2008 and 2012-2013 periods [7]. According to Katipoğlu et al. [14] determined as a result of trend analysis that droughts tend to increase in the Yeşilırmak River Basin, where Kılıçkaya Dam Lake is located. However, the drought, which started with the decrease in precipitation and climate changes, has been increasing day by day in recent years and is progressing in Kılıçkaya Dam Lake. Global climate change and drought caused by the decrease in precipitation cause significant decreases in water level in Kılıçkaya Dam Lake. As a result of the global climate change, which has been more effective since 2016, and the drought caused by the decrease in precipitation in Kılıçkaya Dam Lake, the water level continues to decrease in the Kelkit Stream feeding the Kılıçkaya Dam Lake and in the creeks. After 2016, the water level in Kılıçkaya Dam Lake has been decreasing every year (Figure 1). Kelkit Stream has shrunk due to drought. Due to the decrease in water levels in Kılıçkaya Dam Lake, especially fishermen have suffered a lot in recent years. With the marked decrease in the water occupancy rates of Kılıçkaya Dam Lake in recent years, many areas, especially fisheries and energy, are adversely affected. IV. CONCLUSION While 2016 was the year with the highest occupancy rate in Kılıçkaya Dam Lake, the year with the lowest occupancy rate was found in 2021. If a general conclusion is drawn for Kılıçkaya Dam Lake, it has been observed that the water occupancy rates varied between 18.40 and 56.80 percent between 2010-2021. The data show that there are extreme decreases in water occupancy rates in Kılıçkaya Dam Lake. The results support that, as a result of the decrease in precipitation due to global climate change, the decreases in the water occupancy rates of Kılıçkaya Dam Lake will be greater with the future occurrence and severity of drought. All these show that the effects of drought in Kılıçkaya Dam Lake may be felt even more in the future. According to the results obtained, it is recommended to create a comprehensive and large-scale drought management plan for Kılıçkaya Dam Lake. Accordingly, drought risks should be managed and measures to be taken against drought should be implemented in an integrated manner in Kılıçkaya Dam Lake. ACKNOWLEDGEMENTS The author would like to thank the General Directorate of State Hydraulic Works in Turkey for their support in sharing the water occupancy rate data used within the scope of the study. REFERENCES [1] B. B. Mete, “Climate change and its effects on agriculture in Turkey,” Kırklareli University Institute of Social Sciences, Department of Economics, Master's Thesis, Turkey, pp. 132, 2022. [2] M. Türkeş, “Spatial and temporal analysis of annual rainfall variations in Turkey”, International Journal of Climatology, 16, pp. 1057-1076, 1996.
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