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| 用斜率和曲率湿周法推求河道最小生态需水量的比较 | |
| 引用本文： | 刘苏峡,莫兴国,夏军,LIU Changming,LIN Zhonghui,MEN Baohui,JI Lina.用斜率和曲率湿周法推求河道最小生态需水量的比较[J].地理学报(英文版),2006,16(2):242-250. |
| 作者姓名： | 刘苏峡 莫兴国 夏军 LIU Changming LIN Zhonghui MEN Baohui JI Lina |
| 作者单位： | [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 |
| 基金项目： | National Natural Science Foundation of China, No.90211007; No.50279049; Knowledge Innovation Project of IGSNRR,CAS, No.CXI0G-A04-12, No.CX10G-E01-08 |
| 摘 要： | 1 Introduction With a long term of increasing water demand by industry, agriculture and domestic use along the rivers since the 20th century all over the world, the contradiction between the rational water use and water (ecological) environmental protect… |
| 关 键 词： | 河道 最小生态需水量 斜率 曲率湿周法 |
| 收稿时间： | 2005-12-07 |
| 修稿时间： | 2005-12-072006-02-12 |
Estimating the minimum in-stream flow requirements via wetted perimeter method based on curvature and slope techniques |
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| Suxia Liu,Xingguo Mo,Jun Xia,Changming Liu,Zhonghui Lin,Baohui Men,Lina Ji.Estimating the minimum in-stream flow requirements via wetted perimeter method based on curvature and slope techniques[J].Journal of Geographical Sciences,2006,16(2):242-250. | |
| Authors: | Suxia Liu Xingguo Mo Jun Xia Changming Liu Zhonghui Lin Baohui Men Lina Ji |
| Institution: | 1. Key Lab. of Water Cycle & Related Land Surface Processes, Institute of Geographic Sciences andNatural Resources Research IGSNRR, CAS, Beijing 100101, China 2. Key Lab of Ecological Net Observation and Modeling, IGSNRR, CAS, Beijing 100101, China 3. Key Lab. of Water Cycle & Related Land Surface Processes, Institute of Geographic Sciences andNatural Resources Research IGSNRR, CAS, Beijing 100101, China;College of Water Conservancy and Architectural Engineering, Northwest A & F University, Xi'an 71210 |
| Abstract: | 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. |
| Keywords: | uncertainty wetted perimeter minimum in-stream flow requirements analytical solution Western Route South-to-North Water Transfer Project in China |
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