• 论文 •

岔巴沟流域次暴雨产沙统计模型

1. 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
• 收稿日期:2003-12-03 修回日期:2004-03-19 出版日期:2004-08-15 发布日期:2004-08-15
• 作者简介:蔡强国(1946-),男,湖北武汉人,研究员,博士生导师。主要从事土壤侵蚀、水土保持、流水地貌、 流域侵蚀产沙等方面研究。E-mail:caiqg@igsnrr.ac.cn
• 基金资助:

国家自然科学基金资助项目(40271075);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(CXIOGA000502)资助

Research of sediment yield statistical model for single rainstorm in Chabagou drainage basin

CAI Qiang guo1, LIU Ji gen1, LIU Qian jin2

1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
2. Huazhong Agricultural University, Wuhan 430070, China
• Received:2003-12-03 Revised:2004-03-19 Online:2004-08-15 Published:2004-08-15

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.