| 岔巴沟流域次暴雨产沙统计模型 |
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| 引用本文： | 蔡强国,刘纪根,刘前进.岔巴沟流域次暴雨产沙统计模型[J].地理研究,2004,23(4):433-439. |
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| 作者姓名： | 蔡强国 刘纪根 刘前进 |
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| 作者单位： | 1. 中国科学院地理科学与资源研究所,北京,100101
2. 华中农业大学,武汉,430070 |
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| 基金项目： | 国家自然科学基金资助项目 (40 2 710 75 )，中国科学院知识创新工程重要方向项目“水蚀预报模型研究”与中科院地理科学与资源研究所知识创新工程项目 (CXIOG A0 0 0 5 0 2 )资助 |
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| 摘 要： | 流域综合治理规划、防治土壤侵蚀、合理利用水沙资源 ,无不需要掌握流域产沙情况。流域产沙统计模型结构简单 ,计算方便 ,是现有产沙预报的强有力工具。本文以陕西省岔巴沟流域及其支流实测降雨水文资料为基础 ,系统地分析了流域产沙的降雨、径流、地貌因子在流域产沙中的作用 ,进而将影响产沙的因素概括为径流深、洪峰流量、流域面积、流域沟道密度 ,并作为产沙预报的指标 ,建立了岔巴沟流域次暴雨产沙的统计模型。经检验 ,该预报公式具有一定的精度。
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| 关 键 词： | 流域产沙 降雨因子 径流因子 地貌因子 统计模型 |
| 文章编号： | 1000-0585(2004)04-0433-07 |
| 收稿时间： | 2003-12-03 |
| 修稿时间： | 2003年12月3日 |
Research of sediment yield statistical model for single rainstorm in Chabagou drainage basin |
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| CAI Qiang guo,LIU Ji gen,LIU Qian jin.Research of sediment yield statistical model for single rainstorm in Chabagou drainage basin[J].Geographical Research,2004,23(4):433-439. |
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| Authors: | CAI Qiang guo LIU Ji gen LIU Qian jin |
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| Institution: | 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;2. Huazhong Agricultural University, Wuhan 430070, China |
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| Abstract: | Research on drainage basin erosion and sediment yield amount is not only an important task in physiognomy, but also an important one in river harnessing and water conservancy construction. Drainage basin runoff and sediment formation is a very complex physical process. The fundamental reason for it is the result of rainfall and drainage basin underlying horizon reciprocity. Mathematically, it is an altitudinal nonlinear mapping relation from drainage basin underlying horizon and rainfall conditions to drainage basin runoff and sediment transport. The structure of drainage basin sediment yield statistical models is simple, convenient to calculation and serves as a power tool available for sediment yield prediction. Many researchers according to their study region and measures, established different empirical statistical models. Although so many empirical statistical models were set up, the factors they considered were not the same. This paper tries to conducted an integrated analysis of the effect of rainfall, runoff and physiognomic forms on drainage basin sediment yield, on the basis of considering sediment yield mechanism and to establish sediment yield formula for single rainstorm in Chabagou drainage basin which will have a certain sediment yield mechanism. It is also hopefully to offer some references for other researchers in establishing drainage basin statistical models. Through integrated analysis of the effect of rainfall, runoff and physiognomic factors on sediment yield, we can find that as for the effect of rainfall amount and its temporal and spatial changes on drainage basin sediment, the correlation coefficient of rainfall amount and rainfall intensity product PI with drainage basin sediment yield modulus M s is the highest. But when we consider rainfall runoff effect on drainage basin sediment yield, rainfall action has become negligible, the main factors affecting sediment yield are runoff depth H and flood peak discharge Q W. The effect of runoff depth H on sediment yield is essential, but its effect on sediment yield of different scales of drainage basins is the same. Flood peak discharge Q W is mainly accountable for the remarkable difference in sediment yield of drainage basins of different scales. With the increase of area, the effect of flood peak discharge Q W on drainage basin sediment yield also weakens. Of the physiognomic factors, drainage basin area and ravine density play the leading role, and drainage basin channel gradient ratio is on the comparatively secondary position. |
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| Keywords: | drainage basin sediment yield rainfall factors runoff factors physiognomic factors statistical models |
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