Abstract
Areas of high soil moisture associated with high pore pressure can decrease the shear strength of the material making a slope susceptible to fail. In a humid environment, the distribution of soil moisture is typically determined based on topography. However, in a semi-arid environment, little research has been conducted to assess the relationship between soil moisture and topography index, such as Topography Wetness Index (TWI) due to excessive costs, time restrictions and/or poor accessibility. This paper examines the relationship between the two variables (soil moisture and TWI) in the Walnut Gulch Experimental Watershed using remote sensing techniques. Soil moisture has been measured at few sample sites in the watershed. Images from the Shuttle Radar Topography Mission (SRTM) were used to create digital elevation models to obtain the Topography Wetness Index. A continuous soil moisture map was then created using geostatistical interpolation, incorporating the relationship between the two variables. The cross-validation method has been used to check the accuracy of the interpolation.
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