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作 者:刘忠义 莫淑红[1] 李斌斌[2] 蒋凯鑫 LIU Zhongyi;MO Shuhong;LI Binbin(Cultivation Base of State Key Laboratory of Northwest Arid Region Ecological Water Conservancy Project,Xi’an University of Technology,Xi’an,Shaanxi 710048,China;Soil and Water Conservation Monitoring Center,Ministry of Water Resources,Beijing 100053,China)
机构地区:[1]西安理工大学西北旱区生态水利工程国家重点实验室培育基地,陕西西安710048 [2]水利部水土保持监测中心,北京100053
出 处:《中国水土保持》2022年第11期48-52,I0005,共6页Soil and Water Conservation in China
摘 要:为探究川中丘陵区典型小流域不同类型洪水的侵蚀输沙特征,以四川省盐亭县万安小流域为研究对象,基于2015—2019年实测水文泥沙数据,以产流历时、径流深和洪峰流量作为分类指标,采用快速聚类分析法和判别分析法将统计洪水事件划分为A、B、C三类,并进一步探析了各类洪水的侵蚀输沙特征和不同洪水类型的输沙模数与其径流侵蚀功率之间的函数关系。研究结果表明:不同洪水类型下的产流历时、径流深、洪峰流量大小排序均为B>A>C,输沙模数、最大含沙量、平均含沙量大小排序均为B>A>C;B、A、C三种类型洪水的相对输沙模数之比为3.62∶1.41∶1,与C型洪水相比,A型洪水的平均输沙模数增加了41%,B型洪水的平均输沙模数增加了262%,表明不同类型洪水在径流深相同的条件下由水沙关系引起的输沙效应较大;万安小流域不同类型洪水的径流侵蚀功率和输沙模数之间具有较为显著的幂函数相关关系。In order to explore the characteristics of erosion and sediment transport of different types of flood in the typical small watershed in hilly region of central Sichuan,the paper divided the statistical flood events into three categories of A,B and C,further analyzed the characteristics of erosion and sediment transport of all kinds of floods and explored the functional relationship between sediment transport modulus of different flood types and runoff erosion power by taking Wan’an watershed in Yanting County,Sichuan Province as the research object,based on the observed hydrological and sediment data from 2015 to 2019,using the runoff duration,runoff depth and flood peak discharge as classification indexes and using the methods of rapid cluster analysis and discriminant analysis. The outcomes show that a) the order of runoff duration,runoff depth and flood peak discharge under different flood types is B>A>C. And the order of sediment transport modulus,maximum sediment concentration and average sediment concentration is B>A>C. The ratio of the relative sediment transport modulus of B,A and C floods is 3. 62 ∶ 1. 41 ∶ 1. Compared with type C flood,the average sediment transport modulus of type A flood is increased by 41% and the average sediment transport modulus of type B flood is increased by 262%,showing that the sediment transport effect caused by the relationship between water and sediment is larger under the same runoff depth of different types of floods and;b) there is a significant power function correlation between runoff erosion power and sediment transport modulus of different flood types in Wan’an small watershed.
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