浅析港区对河流水力特性及行洪安全的影响

Analysis on the influence of port on the hydraulic characteristics and flood safety of rivers

入海河流的水力特性及行洪安全主要受所在海域的潮流、泥沙影响。本文以河北省某港区工程项目为例,建立基于MIKE21的二维潮流模型、SWAN波浪模型,采用大中小嵌套模型计算某港区附近海域及两条入海河流河口在工程建设前后的潮位、流速的变化,分析讨论港区建设对入海河流河道水力特性及行洪安全的影响。计算结果表明,工程建设对河道设计防洪(潮)水位影响不大,对陡河河口和沙河河口区域的洪水位、流速变化影响很小。即工程建设对河道的河势稳定、行洪安全影响不大。本文可为今后分析港口工程建设对入海河流的影响以及编制相关河流防洪影响评价报告提供参考。

The water conservancy characteristics and flood safety of seagoing rivers are mainly affected by tide current and sediment in the sea areas.Taking a port project in Hebei province as an example,this paper established a two-dimensional model of tide based on Mike21,SWAN wave model.Large,medium and small nested models were used in calculating the changes of tide level and velocity in the sea area and in the estuaries of two seagoing rivers before and after constructing the project.By calculating the changes of tide level,current speed and sedimentation in the sea area and the estuary of two seagoing rivers near the port before and after constructing the project.This paper aimed at analyzing and discussing the influence of port construction on the hydraulic characteristics and flood safety of the two seagoing rivers.The calculation results showed that the construction of the project had little influence on the design flood control(tide)water level of the rivers,and had little influence on the velocity and flood levels of the Douhe River Estuary and the Shahe River Estuary.Finally,It concluded that the project had little influence on water conservancy characteristics and flood discharge safety of the two rivers.It provided a thought to analyze the influence of the port project construction on seagoing rivers and compile flood control impact assessment reports of similar rivers.