黄河下游陆集滩“二级悬河”治理模型试验研究

Validation of the Secondary Suspended River Management Effect in LYR by the Physical Model Examination

在以往研究的基础上,根据试验研究河段的水文、泥沙特点,合理设计物理模型比尺,并对模型进行水位过程率定和验证,对黄河下游"二级悬河"试验河段淤填堤河治理措施进行物理模型效果检验。实体模型试验表明,通过"二级悬河"治理,当遇到较大上滩洪水时,滩地顺堤行洪流速降低,堤根水位下降、水深减小,洪峰期滩区分流比减小,滩区断面形态得到一定改善,滩地横比降大幅减小,"二级悬河"形势发生明显改善,堤防的安全性大幅提高。

Based on the past achievement,the physical modelwas designed followed by the characters of hydrology and sediment in the researched reach and the artificial deposition management in the secondary suspended channel in LYR were validated by it.Through the physical model examination,it is dedicated that the deposition management may reduce the velocity of the flood along the dike;the water level and depth are descended near the levee;the ratio of flood on the beach is decreased;the transverse of gradient debated and the cross section pattern of the beach can be improved.The situation of the secondary suspended channel can be ameliorated greatly and the security of the levee will be increased.