1. GIS Applications in Geotechnical
(Soils) & Environmental
Engineering
Hawaii Pacific GIS Conference 2012
March 7, 2012
Elise Leroux, Associate
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2. Geotechnical Consulting
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3. Slope stability study, near
Hāwī, Big Island
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4. Dam safety study, Kaua‛i
Geotechnical
investigation, Mauna
Lani, Big Island
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5. Compaction testing
on new waterline,
Moloka‛i
Mass grading for
housing at Ford
Island, O‛ahu
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6. Pile driving, Arizona
Memorial Visitor Center,
Pearl Harbor
Geotechnical test pit for
Waimānalo Stream restoration
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7. What does this have to do with GIS?
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8. Maps for Project Reports

9. Location
maps
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10. Geologic
mapping
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11. Geologic
mapping;
differing
soils
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12. Historic
geologic
mapping
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13. Soil
mapping
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14. Maps for Field Investigations

15. Mapping sample locations –
Step 1: layout points based on plan 15

16. Mapping sample locations –
Step 2: georeference plan 16

17. Mapping sample locations –
Step 3: remove plan 17

18. Mapping sample locations –
Step 4: add coordinates; grid 18

19. Example on large project 19

20. Historical Landforms and
Planned Construction
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21. Map depicting
former sump
and boring
locations
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22. Location
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23. Georeference historical map 23

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38. Georeference historical photo 38

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41. Approximate the boundary based on
historical maps & photos 41

42. Overlay site plan 42

43. Map book for road design
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48. 48

49. Hydrology and hydrogeology
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50. Slope stabilization,
Nu‛uanu Stream,
O‛ahu
Sheet piling,
Middle Street,
Honolulu
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51. Stormwater Runoff and GIS
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52. Calculating
runoff to
plan for
construction
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54. Surface water hydraulic analysis
 Problem: stormwater washing out road
during construction
 Who is responsible for extra costs?
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55. Analysis procedure
 Map problem areas
 Map contributing drainage area(s) for
each
 Calculate design flow for each drainage
area
 Calculate design drainage for each
problem area
 Based on road linear foot
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58. Analysis continued
 Calculate flows from actual storm
 Compare with design flows (design was
greater)
 Estimate necessary size of diversion
structures
 Compare with original design
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59. 59

60. Environmental Consulting
Environmental
sampling at
Kalaeloa, O‛ahu
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61. Environmental Investigations
Direct push
drilling for
groundwater
contamination
investigation,
Waikīkī
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62. Environmental
soil sampling,
Hanua Street,
Kapolei
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63. DETERMINING SAMPLE
LOCATIONS
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66. Mapping sample
locations 66

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68. Environmental Permitting
Excavation that
will require
dewatering,
Honolulu Zoo,
Waikīkī
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69. Environmental
Permitting
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70. Environmental
Permitting
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71. Environmental
Planning
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72. ROCKFALLS
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73. Boulder problem
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75. From whose land did it come?
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76. Step 1: Map possible source based
on contours 76

77. Georeference historical image
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78. Georeferencing is imprecise
 Nature of aerial imagery from low-flying
aircraft
 Distortion away from flightline
 Vast changes in landscape & development
 Few tie-points
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79. This one is better due to increased
tie-points 79

80. Multiple historical images may help
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81. Landowners
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82. Analysis
 Boulder came from state land
 Unclear if it was from land previously
“worked”
 Recommend field investigation
 May be possible to determine exact location
 Can assess future hazards
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83. IMAGES FOR COMMUNITY
MEETINGS
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84. Rock slide investigation,
Koko Crater, O‛ahu
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86. Boulder investigation,
Koko Crater, O‛ahu
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87. Images for community presentations
$
Boulder locations & elevations
Koko Crater Rock Fall Investigation,
April 2009
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88. Rock slide probable path
$
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90. Rock slide probable path
$
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91. Rock slide
probable path
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92. QUESTIONS?
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93. Mahalo!
Contact info:
Elise Leroux
eleroux@masafujioka.com
tel. (808) 484-5366
Masa Fujioka & Associates
98-021 Kamehameha Hwy #337
Aiea, HI 06701
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