湘江长沙综合枢纽工程坝区河段河床变形预报试验研究

Experimental study of channel variation in dam area of Changsha navigation & hydropower complex in Xiangjiang River

文章基于全沙动床物理模型,对湘江长沙综合枢纽坝区河段河床变形情况进行模型试验研究。在模型河床变形验证相似的基础上,对枢纽正常运行初期中水中沙典型年以及丰水丰沙典型年坝区河床变形进行预报。研究表明枢纽建成正常运行后,中水年与丰水年坝区河段河床冲淤变化规律相似,但变化幅度要小。坝上河床冲淤相间,总体稍有淤积;坝下近坝段冲刷深度较大,冲刷的泥沙主要在下游附近河床淤积,随着枢纽运行时间的延长,该段河床的淤沙逐渐向下游输移。

The normal scale physical model test was used in this paper to investigate the channel variation in the dam area of Changsha navigation ＆ hydropower complex in Xiangjiang River. After the similarity verification,the physical model was used to study the channel variation during the construction of the normal operation of the hydro-project in a typical year with the moderate amount of water and sediment and the year with abundance of water and sediment. The results show that the channel variations after the construction are similar, and the variation range is rather small in the year with the moderate amount of water and sediment. Changes of scouring and deposition have taken place near the dam area. There is scouring near the construction area and the deposition is taken place in the downstream area.