Evaluating and Mapping the Stability of Slopes in Napa County with a GIS-based Model Dongyuan Wang...
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![Page 1: Evaluating and Mapping the Stability of Slopes in Napa County with a GIS-based Model Dongyuan Wang Ph.D candidate in geotechnical engineering The University.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f315503460f94c4cd69/html5/thumbnails/1.jpg)
Evaluating and Mapping the Stability of Slopes in Napa County
with a GIS-based Model
Dongyuan Wang
Ph.D candidate in geotechnical engineering
The University of Texas at Austin
December 7, 2000
![Page 2: Evaluating and Mapping the Stability of Slopes in Napa County with a GIS-based Model Dongyuan Wang Ph.D candidate in geotechnical engineering The University.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f315503460f94c4cd69/html5/thumbnails/2.jpg)
Outline Outline Objective Background Data Preparation SINMAP Model Implementing SINMAP Outputs of SINMAP Discussions Acknowledgement
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ObjectivesObjectives
Make the evaluation results visualized and accessible to the people.
Through this showcase, explore the feasibility of applying GIS in geotechnical engineering;Show how to evaluate and map the stability of slopes with SINMAP, a GIS-based model.
![Page 4: Evaluating and Mapping the Stability of Slopes in Napa County with a GIS-based Model Dongyuan Wang Ph.D candidate in geotechnical engineering The University.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f315503460f94c4cd69/html5/thumbnails/4.jpg)
BackgroundBackground
Why Napa County?
•Development require more Lands;
•Landslide is one of main natural disasters plaguing the people in every country.
Why slope stability?
Why GIS?
![Page 5: Evaluating and Mapping the Stability of Slopes in Napa County with a GIS-based Model Dongyuan Wang Ph.D candidate in geotechnical engineering The University.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f315503460f94c4cd69/html5/thumbnails/5.jpg)
Landslides in USALandslides in USA
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Landslides in USALandslides in USA
![Page 7: Evaluating and Mapping the Stability of Slopes in Napa County with a GIS-based Model Dongyuan Wang Ph.D candidate in geotechnical engineering The University.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f315503460f94c4cd69/html5/thumbnails/7.jpg)
Data Preparation(1) Data Preparation(1) DEMs: from USGS website
Only part of Napa CountySDTS GridScale:1:24000UTM projection
Soils: from USDA website SSURGOUseful files: comp,layer,
mapunit“Unifiled” field in “layer”
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Data Preparation (2)Data Preparation (2)
Landslides: from USGS websiteIn geographic coordinates systemConvert it to UTM;Landslide PointsAdd “type” filed to
the shapefile
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SINMAP SINMAP
An ArcView extension to calculate and map stability index of slopes based upon geographic information, primarily on DEMs.
Theoretical BasisInfinite slope model Topographic wetness index, R/T ratioDistribution: Uniform
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Implementing SINMAP (1)Implementing SINMAP (1) Model Parameters
Gravity constant: 9.81 m/s2
Soil Density: 2000 kg/m3 Water Density: 1000 kg/m3·
Number of points in SA Plot: 2000 Calibration Parameters
T/R ratio: 2000-3000 m Dimensionless cohesion: 0.0-0.25
Angle of internal friction: 30-45 degrees
Lower wetness line percentage: 10%
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Select DEM Grid Calibration area
Use “comp” file in soil date to create a calibration area; Clip “unifiled” field in “layer” to “comp” manually.Add landslide points;
Analyze Stability by adjusting calibration parameters
Implementing SINMAP(2)Implementing SINMAP(2)
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Outputs (1) Outputs (1)
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Outputs(2)Outputs(2)
![Page 14: Evaluating and Mapping the Stability of Slopes in Napa County with a GIS-based Model Dongyuan Wang Ph.D candidate in geotechnical engineering The University.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f315503460f94c4cd69/html5/thumbnails/14.jpg)
DiscussionsDiscussions
1. Can we apply GIS in geotechnical engineering ?
2. Does SINMAP work well ?
3. Future work ?
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AcknowledgementAcknowledgement Dr. Maidment at UT Dr. Tarbonton, Bob Pack and Craig Goodwin
at USU
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