松西河水沙特性变化及冲淤响应

松西河为松滋河西支,为荆江河段分泄江流的主要洪道之一,近年来,其分流分沙量居三口之首。选取长江干流及松西河60余年实测水文资料,分析了人类活动影响前后松西河径流量、输沙量、水沙相关关系及分流分沙特性变化。结果表明,下荆江裁弯取直、葛洲坝修建、三峡水库蓄水运用等人类活动为松西河水沙特性变化的主要影响因素,其中,三峡工程的影响最为显著,三峡蓄水运用后松西河水沙特性变化与干流一致;随着三口分流分沙特性变化,松西河水沙特性已发生明显变化;三峡蓄水后松西河呈冲刷态势。

Study on Change of Water and Sediment Characteristics in Songxi River and Erosion Response

The Songxi River is the west branch of the Songzi River and is one of the main rivers that divide the river in the Jingjiang River. In recent years, its diversion and sedimentation volume ranks first among the three. This paper selects the measured hydrological data of the main stream of the Yangtze River and the Songxi River for more than 60 years, and analyzes the relationship between the runoff, sediment transport, water and sediment related and the distribution characteristics of the Songxi River before and after the impact of human activities. The research shows that in the human activities such as the straightening of the bend, the construction of the Gezhouba Dam, and the storage of the Three Gorges, the Three Gorges Project has the most significant impact on the water and sediment characteristics of the Songxi River. After the storage of Three Gorges Reservoir, the water and sediment characteristics of the Songxi River change are consistent with the main stream. With the change of the characteristics of sediment distribution in three branches, the characteristics of water and sediment in the Songxi River have changed significantly. After the storage of Three Gorges, the Songxi River was scouring.