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۱ANALYSIS OF RELATIONS BETWEEN WATER EROSION FEATURES AND EFFECTIVE PARAMETERS ON THEIR INTENSITY AND SPATIAL PATTERNS (CASE STUDY: BALEGHLI CHAY WATERSHED, ARDEBIL, IRAN)
نویسنده(ها): ، ، ،
اطلاعات انتشار: Desert، سيزدهم،شماره۲، ۲۰۰۸، سال
تعداد صفحات: ۱۱
Soil erosion results from an interaction of several parameters, which vary in space and time. Awareness of environmental changes and their impact on the intensity and spatial pattern of water erosion can effectively help in recognition of erosional reactions versus the affecting factors. The aim of this paper is to describe the development of a methodology based on present knowledge and available data, for evaluation of water erosion behavior and risk as well as an estimation of soil erosion. Accordingly, based on the conducted research on different types of water erosion in some areas of Baleghli Chay Watershed, between two hydrometric gauging stations were studied, with an exclusion of erosion due to mass movements. Four major types of water erosion namely: sheet, rill, channel and streambank which play a considerable role in sediment yields of the area, were separately studied. In order to determine the inter–effects of erosive factors, the study was conducted using multivariate statistical tests. For each erosion type, an individual model was then presented. The results indicated complex and different interactions between the likelihood of water erosion and environmental changes in the study area. Sheet and rill erosions act differently from channel erosion while streambank erosion is completely different from others. Therefore, a study of individual types of water erosion can help in recognition of accelerating factors that effectively influence water erosion, and consequently to come up with appropriate models.

۲Desertification Hazard Zonation by Means of ICD Method in Kouhdasht Watershed
اطلاعات انتشار: Desert، هفدهم،شماره۲، ۲۰۱۳، سال
تعداد صفحات: ۸
In recent years, the topic of desertification has been discussed in different ways in scientific areas. This event occurred globally, regionally and nationally and many steps were taken to stop it. Desertification is challenged universally and its destructive effects are unavoidable and its consequences do endanger the life of inhabitants. The identification of sensitive regions and prevention and avoidance from damages resulted desertification is the first step. Then various methods are used to preparation of plans and maps as well as to recognize the zones. Among these, ICD method was chosen for the area. Finally the plan of the present status of desertification was provided. In this plan anthropogenic causes as well as environmental cause, the kind of process, the determining criterion and subcriterion, the class and the severity of desertification were indicated. The results show the fact that desertification phenomena with average severity took place in the area and it is extending.
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