Hydrogeomorphological Analysis of Nachi Basin Emphasizing Erosion and Sedimentation

Soil is one of the most important factors of production that has a great impact on human economic and social life. Earth's surface is generally covered with soil and surface deposits. Soil erosion is one of the most important issues that we face today. Increasing exploitation and lack of proper human management of the natural environment have a great influence on the intensification of soil degradation and erosion. In this research, by analyzing effective geomorphologic parameters, the erosion and sediment production in the Nachi basin is studied and, along with necessary studies, effective strategies and suggestions are presented. In this study, in addition to field surveys, various documents such as topographic maps, geology, resources and land potential, vegetation, various statistics related to hydrometric stations, sedimentation, meteorology, pluviometry, along with aerial photos and satellite imagery have been used as research tools. In order to estimate the amount of erosion and sediment in the studied area, the modified PSIAC model has been used. By studying the nine effective factors in this model, the production rate of sediment and erosion in hydrological units of the basin have been estimated. Accordingly, the annual erosion and sediment in the total study area is estimated 1254 m3 for each 1 km2.