Application of GIS in Modeling Rainfall Erosivity Factor (Case Study: Gabric Watershed- Hormozgan Province East South)

If other factors are held constant erosion, soil loss rate is directly proportional to the amount of rain erosion. Various measures have been proposed so far in the world, depending on geographic location, scale, local conditions and the type of measurement are different. A review of studies conducted worldwide and the limited rain gauge equipped, modified Fournier index is calculated based on the statistics of monthly and annual rainfall, were used. Therefore, the index of the 22 stations with 11 years of rainfall statistics was calculated for the Watershed Gabric. After rain erosion index for the desired station using the software GS+1.1.1, Geo-statistical extensions based on geo-statistical method kriging ESRI®ArcMap™ 10.0 in rain erosion factor map was drawn to this area. In this study, we have compared three kriging techniques: simple, universal and ordinary kriging. The obtained results show that ordinary kriging with a 394.42 Root Mean Square Error (RMSE) is the most proper interpolation technique.