Document Type : Research Paper
Authors
Department of Nature Engineering, Faculty of Natural Resources and Environmental Sciences, University of Yasouj, Yasouj, Iran
Abstract
The aim of the present study is to investigate the trend of changes in the severity of soil erosion risk in the area of Yasouj city during the period 1992 to 2025 using the SL 190-2007 standard and remote sensing data in the geographic information system environment.
In this study, in order to assess the risk of soil erosion, a combination of slope angle, vegetation cover and land use parameters was used. The slope angle was extracted from the digital elevation model. Land use maps were prepared and validated using Landsat TM satellite images for 1992 and ETM+ for 2025 and using the supervised classification method using the maximum likelihood method. In order to quantify the vegetation cover, the normalized difference vegetation index (NDVI) was calculated and the vegetation fraction (VFC) was extracted using the dual pixel model (DPM). Finally, based on the SL 190-2007 standard, soil erosion risk maps were prepared in six classes: very low, low, moderate, severe, very severe, and extremely severe, and their spatial-temporal changes were analyzed.
The results showed that during the period 1992 to 2025, the soil erosion risk pattern in Yasouj city has undergone significant changes. The area of severe, very severe, and extremely severe risk classes has increased from a total of 36% in 1992 to 62% in 2025, while the share of very low and low risk classes, which included more than half of the area of the region at the beginning of the period, has decreased significantly.
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