In order to understand the variation and causes of runoff and sediment in the major rivers in North Chi-na,the variation characteristics of runoff and sediment load at representative stations from 1950 to 2020 are ana-lyzed using the M-K test method and the hydrological accumulation curve method,and its main influence factors are discussed in this article.The results indicate that there is a decrease or a significant decrease trend in the an-nual runoff of the other northern rivers except for the Huai River without significant variation.And the annual sed-iment load at representative stations in other northern rivers has a significant decreasing trend except for the Song-hua River without significant variation.The main factors affecting runoff and sediment load include water and soil conservation,reservoir construction,precipitation changes,diversion of water and sediment,comprehensive u-tilization of sediment,and excessive construction.Among them,water and soil conservation is the main measure for water conservation and sediment reduction in the northern rivers.The regulation and sediment retention of res-ervoirs play an important role in the water and sediment variation of the river.In addition,the variation of precip-itation is also a factor affecting the variation of water and sediment in the northern rivers.Besides,water and sed-iment diversion as well as comprehensive sediment utilization also play a certain role in runoff and sediment chan-ges of the northern plain rivers.
关键词
北方河流/水沙变化/趋势分析/主要影响因素/人类活动
Key words
Northern rivers/runoff and sediment load variations/trend analysis/main influencing factors/hu-man activities
维普
万方数据