期刊名称：Journal of Applied Technology in Environmental Sanitation
印刷版ISSN：2088-3218
电子版ISSN：2088-3579
出版年度：2011
卷号：1
期号：1
页码：53-67
出版社：Sepuluh Nopember Institute of Technology
摘要：The entire land of Southern Iran faces problems arising out of various types of land degradation of which water erosion forms a major type. A new model has been developed for assessing the risk of water erosion. Taking into consideration nine indicators of water erosion the model identifies areas with 'Potential Risk' (risky zones) and areas of 'Actual Risk' as well as projects the probability of the worse degradation in future. The Mond river basin, located centrally to this zone, has been selected as a test area to assess the risk of water erosion and to suggest appropriate remedial measures. For this purpose two sub basins of the Payab and Qareh Aghaj have been chosen for detailed study as these two provide enough variation in climatic conditions like rainfall and topography. The preparation of risk maps based on the GIS analysis of these indicators will be helpful for prioritizing the areas to initiate remedial measures. The different kinds of data for indicators of water erosion were gathered from the records and published reports of the governmental offices of Iran. By fixing the thresholds of severity classes of the nine indicators a hazard map for each indicator was first prepared in GIS. The risk classes were defined on the basis of risk scores arrived at by assigning the appropriate attributes to the indicators and the risk map was prepared by overlaying nine hazard maps in the GIS. Areas under potential risk have been found to be more widespread (63%) in the Qareh Aghaj basin while actual risk areas are more extensive (78%) in the Payab. When areas under potential risk are classified into subclasses with different probability levels the model projects a statistical picture of the risk of water erosion
关键词：Water erosion; GIS; indicator; actual risk; potential risk
