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Erosion Vulnerability Assessment of sperchios River Basin, in East Central Greece—A GIS Based Analysis

Open Journal of Geology 2017年第5期7卷 621-646页

作者： Nikolaos Stathopoulos Evdoxia Lykoudi Eleni Vasileiou Dimitrios Rozos Dimitrios Dimitrakopoulos Department of Geological Sciences School of Mining Engineering and Metallurgy National Technical University of Athens Athens Greece Department of Hydrogeological Studies Direction of Studies and Development of Mines Public Power Corporation of Greece Athens Greece

One of the most important natural processes, with significant environmental impacts, is soil erosion. The aim of this paper is to evaluate and assess the erosion vulnerability of the geological formations constituting sperchios River basin, in Eastern Central Greece, as well as to distinguish and locate the areas of such risk and estimate it. The developed methodology in this paper is based on Multi-Criteria Evaluation (MCE), with the implementation of Weighted Cartographic Overlay (WCO) technique in Geographic Information Systems (GIS) environment. By applying this method, an attempt was made to combine a set of factors, such as geological-hydrogeological characteristics, morphological slopes and hydrographic texture (causative factors of the phenomenon) along with rainfall (triggering factor) and land cover/use (competitive factor). The weighted combination of these factors defines the vulnerability of the formations in the area of interest. The main results of the methodology are two thematic maps of erosion vulnerability of sperchios basin’s formations, one that does not include land use/cover factor and one with current existing conditions of the basin (co-evaluating land use/cover). In the first case, 36% of the basin surface undergoes high erosion vulnerability, while 53% present medium vulnerability. These percentages reduced significantly in the second case (3% is the high erosion vulnerability category and 38% the medium one), fact that proves the importance of vegetation in erosion restriction and protection of the geological formations consisting the sperchios River basin.

关键词： Erosion Vulnerability sperchios River Basin Geographical Information Systems Multi-Criteria Evaluation

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