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天然河道弯道处水流过程复杂。洪水风险研究中,一般先对河道建立一维水动力数值模型,再与岸上陆地二维水动力数值模型相耦合。由于山区河道弯道处的横向水位差较大,一维水动力模型无法反映两岸水位差,需对整个项目区建立整体二维水动力数值模型。该文以富屯溪顺昌县城区段天然河道为例,分析天然河道弯道水流特性,借助二维水动力数值模型模拟弯道水流,计算不同弯段、不同洪峰流量下的横向水位差,分析弯道横向水位差的影响因素。
Natural river bend at the water flow process is complicated. In the study of flood risk, one-dimensional hydrodynamic numerical model is generally established first for the river and then coupled with onshore two-dimensional hydrodynamic numerical model. Due to the large lateral water level difference at the curve of the mountain river, the one-dimensional hydrodynamic model can not reflect the water level difference across the Taiwan Strait. Therefore, a two-dimensional hydrodynamic numerical model should be established for the entire project area. Taking the natural river course in Shunchang county section of Fu Tun Tun as an example, this paper analyzes the water flow characteristics of the natural river bend, simulates the water flow of the bend by means of two - dimensional hydrodynamic numerical model, calculates the horizontal water level difference at different bend sections and different flood peak flow, Analysis of the factors affecting the lateral water level difference in the curve.