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http://dx.doi.org/10.7843/kgs.2013.29.7.75

Predicting Rainfall Infiltration-Groundwater Flow Based on GIS for a Landslide Analysis  

Kim, Jung-Hwan (Dept. of Civil and Environmental Eng., Yonsei Univ.)
Jeong, Sang-Seom (Dept. of Civil and Environmental Eng., Yonsei Univ.)
Bae, Deg-Hyo (Dept. of Civil and Environmental Eng., Sejong Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.29, no.7, 2013 , pp. 75-89 More about this Journal
Abstract
This paper describes a GIS-based geohydrologic methodology, called YSGWF (YonSei GroundWater Flow) for predicting the rainfall infiltration-groundwater flow of slopes. This physical-based model was developed by the combination of modified Green-Ampt model that considers the unsaturated soil parameters and GIS-based raster model using Darcy's law that reflects the groundwater flow. In the model, raster data are used to simulate the three dimensional inclination of bedrock surface as actual topographic data, and the groundwater flow is governed by the slope. Also, soil profile is ideally subdivided into three zones, i.e., the wetting band zone, partially saturated zone, and fully saturated zone. In the wetting band and partially saturated zones the vertical infiltration of water (rainfall) from surface into ground is modeled. When the infiltrated water recharges into the fully saturated zone, the horizontal flow of groundwater is introduced. A comparison between the numerical calculation and real landslide data shows a reasonable agreement, which indicate that the model can be used to simulate real rainfall infiltration-groundwater flow.
Keywords
Rainfall-infiltration; Groundwater flow; Landslide analysis; based on GIS; Green-Ampt model; Rainfall-runoff;
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