Spatial Assessment of Indices for Characterizing the Erosive Force of Rainfall in El Salvador Republic

摘要

Soil erosion data in El Salvador Republic are scarce and there is no rainfall erosivity map for this region.nConsidering that rainfall erosivity is an important guide for planning soil erosion control practices, a spatialnassessment of indices for characterizing the erosive force of rainfall in El Salvador Republic was carried out.nUsing pluviometric records from 25 weather stations, we applied two methods: erosivity index equation andnthe Fournier index. In all study area, the rainiest period is from May to November. Annual values of erosivitynindex ranged from 7,196 to 17,856 MJ mm hau00021 hu00021 yearu00021 and the Fournier index ranged from 52.9 to 110.0 mm.nThe erosivity map showed that the study area can be broadly divided into three major erosion risk zones, andnthe Fournier index map was divided into four zones. Both methods revealed that the erosive force is severe in allnstudy area and presented significant spatial correlation with each other. The erosive force in the country isnconcentrated mainly from May to November.