ESTIMATING THE HAZARDS OF WATER EROSION BY USING REMOTE SENSING AND GEOGRAPHIC INFORMATION SYSTEMS IN THE BASIN DAIHACHIGA, TAKAYAMA CITY,GIFU PREFECT
ESTIMATING THE HAZARDS OF WATER EROSION BY USING REMOTE SENSING AND GEOGRAPHIC INFORMATION SYSTEMS IN THE BASIN DAIHACHIGA, TAKAYAMA CITY,GIFU PREFECT

Summary/Abstract: Water erosion is defined as soil erosion and physical degradation of the landscape over time. The process begins when soil particles are separated from their original configuration by the forces of erosion of rainfall by splash, sheet, rill or gully. Can then be transported soil particles by overland flow in rivers by has networks. The Daihachiga basin is considered to be most important water resource of Takayama city, the basin contains many natural resources which enable substantial agricultural development. The researcher depends on Gavrilovic’s model; Potential Method Erosion (EPM), which was designed for mountainous areas, to determine the surface water erosion hazards in the basin. This model has been applied using remote sensing (RS) techniques and geographic information system (GIS). It was possible to calculate the credibility of the basin as well as the annual erosion rate for the whole basin and sub-basins, based on pixel unit calculations According to digital elevation model (DEM), gradient model of the watershed was prepared too, and it used for some Morphometric parameters. It was clear the foothill and towards the outlet basin areas subject to flooding affecting as the result of the geological structure of the basin, and the steep slopes, vegetation caver, which is an important factor in slowing the runoff, and the weak of the management for retarding floods effect on soil erosion.

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