Modeling regional landslide susceptibility using dynamic soil moisture profiles Modeling regional landslide susceptibility using dynamic soil moisture profiles

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Vol15 No.8: 1807-1824

Title】Modeling regional landslide susceptibility using dynamic soil moisture profiles

Author】RAY Ram L1*; JACOBS Jennifer M2; DOUGLAS Ellen M3

Addresses】1 Cooperative Agricultural Research Center, College of Agriculture and Human Sciences, Prairie View A&M University, Prairie View, TX 77446, United States; 2 Department of Civil Engineering, University of New Hampshire 35 Colovos Rd, Durham, NH 03824, United States; 3 Environmental Earth and Ocean Sciences Department, University of Massachusetts Boston, 100 Morrissey Blvd. Boston, MA 02125, United States

Corresponding author】ramlakhan37@gmail.com

Citation】Ray RL, Jacobs JM, Douglas EM (2018) Modeling regional landslide susceptibility using dynamic soil moisture profiles. Journal of Mountain Science 15(8). https://doi.org/10.1007/s11629-018-4896-3

DOI】https://doi.org/10.1007/s11629-018-4896-3

Abstract】A landslide susceptibility mapping study was performed using dynamic hillslope hydrology. The modified infinite slope stability model that directly includes vadose zone soil moisture (SM) was applied at Cleveland Corral, California, US and Krishnabhir, Dhading, Nepal. The variable infiltration capacity (VIC-3L) model simulated vadose zone soil moisture and the wetness index hydrologic model simulated groundwater (GW). The GW model predictions had a 75% NASH-Sutcliffe efficiency when compared to California's in-situ GW measurements. The model performed best during the wet season. Using predicted GW and VIC-3L vadose zone SM, the developed landslide susceptibility maps showed very good agreement with mapped landslides at each study region. Previous quasi-dynamic model predictions of Nepal's hazardous areas during extreme rainfall events were enhanced to improve the spatial characterization and provide the timing of hazardous conditions.

Keywords】Landslide susceptibility; Vadose zone; Soil moisture; Infiltration capacity; VIC-3L; Groundwater