Document Type : پژوهشی
Authors
1 University of Mohaghegh Ardabili
2 Professor, Department of Soil Sciences, Faculty of Agriculture and natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran
3 M.Sc in Watershed Management Sciences & Engineering, Faculty of Agriculture and natural Resources University of Mohaghegh Ardabili, Ardabil, Iran
4 Assocaite Professor, Department of Natural Resources, Faculty of Agriculture and natural Resources, and Member of Water Management Research Center, University of Mohaghegh Ardabili, Ardabil, Iran
Abstract
Determining the extent of riverbank erosion and displaying it as a map in a GIS environment is effective in the optimal management of water and soil resources. The aim of the current research is to delineate the riverbank erosion zone from aerial photographs, perform regression modeling, and identify factors influencing the development of riverbank erosion using various spatial data including physiographic, hydrological, geological, and environmental data in different sections of the Balikhlouchai River in Ardabil Province. Initially, influential parameters in riverbank erosion in the region, including topographic, soil and land factors, hydrology, and land use changes, were calculated. Accordingly, the variables under study were obtained for four time periods: 1955 using aerial photographs, 1980 using TM satellite images, and years 2010 and 2013 using Google Earth images, and the effective extent of riverbank erosion was compared. Subsequently, multivariate regression analysis was performed using independent variables (including topographic, hydrological, soil erodibility, and land factors) and the effective extent of riverbank erosion as the dependent variable, using SPSS software, and suitable models were developed to estimate the amount of different riverbank erosion. Based on the results of regression analysis, environmental parameters such as slope of the river reaches, peak discharge, area under irrigated agriculture, concentration time, pasture coverage, and residential areas played a more significant role in exacerbating riverbank erosion.
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