黄河下游窄河段挖河断面不同尺度的减淤效果及对河势影响的试验研究

Experimental study on the effect of different dredging scales in the narrow reach of the lower Yellow River on deposition reduction and river regime

根据模型试验的方法,研究了黄河下游窄河段不同挖河断面尺度下的减淤效果,以及对河势的影响。同时,进行了数学模拟计算,以便与河工模型试验结果相互佐证。依据模型试验和数模计算结果,认为,挖河断面越大,开挖河段的回淤量越大,开挖段上游一定范围内河段的溯源冲刷量也越大。另外,挖河可以在一定时段内起到理顺河势的效果,但要维持其效果,还应有一定的河道整治工程相配套。

By using the physical model test and numerical simulation, the effect of different dredging scales in narrow reach of the lower Yellow River on the deposition reduction and river regime has been studied. The results show that the back-silting amount and the retrogressive erosion amount are positively proportioned with the dredging amount. In addition, dredging can make some benefit for the river regime, but additional regulation projects may be needed.