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.
韭园沟流域淤地坝坝系布局评价
- Title:
- Evaluation of Overall Distribution of Check Dam System in the Jiuyuangou Watershed
- Keywords:
- dam system unit; IAHP; entropy method; combination weighting; evaluation of distribution of check dam system
- 分类号:
- S157
- 摘要:
- 淤地坝系的科学布局关系到流域的防洪安全，对淤地坝系布局进行评价，可以为流域坝系工程的规划、建设和设计工作提供理论依据。将黄土丘陵沟壑区韭园沟流域划分为1个主沟坝系单元和14个子坝系单元，选取了大型坝占总比、串联率、库容均衡度、稳定系数、侵蚀模数、洪量模数及保收率7个指标，采用AHP、IAHP、熵权法及组合权重法分别计算了各指标权重，依次对韭园沟坝系布局进行了评价。研究表明：（1）流域部分子坝系单元布局不合理，但全流域坝系布局合理；（2）IAHP法和组合权重法在计算权重时更客观，评价结果较为合理；（3）4种方法中，大型占总比权重系数均达到最大，表明骨干坝对坝系布局有决定性影响；（4）当骨干坝控制全流域50%以上，库容均衡度达0～20万m3/km2，稳定系数达到1/25～1/20，洪量模数0～10万m3/km2，骨干坝串联个数低于2.5座/km时，坝系布局基本合理。
- 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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备注/Memo
收稿日期:2015-09-12;改回日期:2015-10-20。
基金项目:国家自然科学基金重点项目（41330858）；国家自然科学基金（41471226，41401305）
作者简介:王丹(1991-),女,陕西榆林人,在读硕士,研究方向为水文学及水资源。E-mail:danwang943@163.com
通讯作者:李占斌(1965-),男,河南镇平人,博士,研究员,主要从事土壤侵蚀和水土保持方面的研究。E-mail:zbli@ms.iswc.ac.cn