第二松花江洪水对嫩江水位顶托的影响分析

Backwater Effects Analysis of the Second Songhua River to the Nenjiang River

为研究松花江流域第二松花江洪水对嫩江洪水的顶托规律,分别采用水文学方法、MIKE21FM二维水动力模型法分析不同典型年嫩江、二松两江洪水汇合处的顶托情况。结果表明,嫩江在小流量阶段受二松洪水顶托较多,随大赉站、扶余站流量比增大,顶托作用变缓,随流量比减小顶托作用增强;嫩江洪水量级较大时,洪峰前后嫩江受顶托作用影响较小;MIKE21FM二维水动力模型对于分析嫩江受二松洪水顶托情况具有较好的适用性。

In order to study the backwater effects of the Second Songhua River to the Nenjiang River,hydrological methods and two-dimensional hydrodynamic model in MIKE21 FM were used to analyze the backwater situation of the Nenjiang River and the Second Songhua River confluence area in different typical years.The results show that the backwater effects of the Nenjiang River often occurs in the small flow stage.The backwater effects decrease with the rising in flow ratio between the Dalai station and the Fuyu station and increase with the reducing in flow ratio.The backwater effects of the Nenjiang River is less affected by the Second Songhua River when the flood level of the Nenjiang River is large.The MIKE21 FM model has a good applicability in analyzing the situation of the backwater effects of the Nenjiang River.