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Estimating the minimum in-stream flow requirements via wetted perimeter method based on curvature and slope techniques

查看全文 作　　者：LIU Suxia'[1];MO [2]Xingguo;XIA [1]Jun;LIU [1]Changming;[2]LINZhonghui;MEN [1]Baohui;JI [1,3]Lina 高影响力作者 机构地区：[1]Key Lab. of Water Cycle & Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research (IGSNRR), CAS, Beijing 100101, China;[2]Key Lab of Ecological Net Observation and Modeling, IGSNRR, CAS,Beiing 100101, China;[3]College of Water Conservancy and Architectural Engineering, Northwest A & F University, Xi'an 712100, China高影响力机构 出　　处：《Journal of Geographical Sciences》索引2006年第16卷第2期,共9页高影响力期刊 基　　金：National Natural Science Foundation of China, No. 90211007; No.50279049; Knowledge Innovation Project of IGSNRR, CAS, No.CXIOG-A04-12; No.CX10G-E01-08 摘　　要：Under the assumptions of triangular cross section channel and uniform stable flow, an analytical solution of the minimum ecological in-stream flow requirement (MEIFR) is deduced. Based on the analytical solution, the uncertainty of the wetted perimeter method is analyzed by comparing the two techniques for the determination of the critical point on the relationship curve between wetted perimeter, P and discharge, Q. It is clearly shown that the results of MEIFR based on curvature technique (corresponding to the maximum curvature) and slope technique (slope being 1) are significantly different. On the P-Q curve, the slope of the critical point with the maximum curvature is 0.39 and the MEIFR varied prominently with the change of the slope threshold. This indicates that if a certain value of the slope threshold is not available for slope technique, curvature technique may be a better choice. By applying the analytical solution of MEIFR in the losing rivers of the Western Route South-to-North Water Transfer Project in China, the MEIFR value via curvature technique is 2.5%-23.7% of the multi-year average annual discharge, while that for slope technique is 11%-105.7%. General conclusions would rely on the more detailed research for all kinds of cross-sections. 关 键 词：河道 最小生态需水量 斜率 曲率湿周法
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