黄河下游窄河段挖河固堤启动工程减淤效果模型试验研究

通过河工模型试验，研究了黄河下游朱家屋子－西河口河段挖河固堤启动工程的减淤效果。分析表明，挖河后在一定时段内和试验水沙条件下，有一定的减淤效果，挖沙减淤比为0．76左右；开挖段的回淤量对挖河减淤效果影响很大。由于黄河水沙特性和河床演变的复杂性，还有不少关键技术问题需要进一步研究。

Experimental Study on Deposition Reduction Effct Model of River Dredging and Dike Strengthenning Starting Works in the Narrow Reach of the Lower Yellow River

The deposition reduction effect in starting works on river dredging and dike strengthenning between Zhujiawuzi and Xihekou in the Lower Yellow River has been studied through river engineering model experiment. It is shown from the analysis that there are some deposition reduction effects,the ratio of sediment dredging amount to deposition reduction amount is 0 76 or so in a certain period and under the conditions of experimental water|sediment after river dredging;the back|deposition amounts in the dredging reach have great influence over the effect of river dredging for deposition reduction.Due to the characteristics of water|sediment and complexity of fluvial process in the Yellow River,many problems of key techniques need to be studied further.