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[1]WANG Dan,LI Zhanbin,LI Peng,et al.Evaluation of Overall Distribution of Check Dam System in the Jiuyuangou Watershed[J].Research of Soil and Water Conservation,2016,23(05):49-55.

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Evaluation of Overall Distribution of Check Dam System in the Jiuyuangou Watershed

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 05 Page number: 49-55 Column: Public date: 2016-10-28

Title:: Evaluation of Overall Distribution of Check Dam System in the Jiuyuangou Watershed

Author(s):: WANG Dan, LI Zhanbin, LI Peng, GAO Haidong, ZHAO Binhua, YUAN Shuilong; Key Laboratory of Northwest Water Resources and Environment Ecology of Ministry of Education, Xi’an University of Technology, Xi’an 710048, China

Keywords:: dam system unit; IAHP; entropy method; combination weighting; evaluation of distribution of check dam system

CLC:: S157

DOI:: -

Abstract:: The scientific layout of check dam system was related to the safety of flood control of a watershed. The evaluation of overall distribution of check dam system in the Jiuyuangou Watershed were carried out in order to provide theoretical basis for the planning, construction and design work of the dam system engineering of small watershed. The Jiuyuangou Watershed was divided into one main gully dam system unit and 14 sub dam system units, and then the evaluation system of overall distribution of check dam system was established by a comprehensive selection of 7 indexes including the proportion of key dams, series rate, capacity equilibrium degree, stability coefficient, erosion modulus, flood modulus and yield ensuring rate. The Analytic Hierarchy Process (AHP), Improved Analytic Hierarchy Process (IAHP), entropy method and combination weighting method were applied to calculate the weight of each index, through which the overall distribution of the check dam system of Jiuyuangou Watershed was evaluated. The results showed that: (1) although the distribution of part sub dam system units were unreasonable, that of the whole watershed seemed to be reasonable; (2) the results of the IAHP method and the combination weighting method were more reasonable because of their objective theory when calculating the weight coefficient; (3) the weight of the index ‘proportion of key dams’ reached the maximum in the four methods, which further indicated that key dam had a decisive influence on dam system layout; (4) when the key dams controlled above 50% of the whole watershed, capacity equilibrium degree reached to 0～200 000 m³/km², stability coefficient 1/25～1/20, flood modulus 0～100 000 m³/km², the number of series of key dam was less than 2.5 per kilometer, at this time, the overall distribution of check dam system was basically reasonable.

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