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Numerical simulation study on hydraulic behavior at the confluence of Yangtze River and Jialing River

机译：长江和嘉陵江汇流液体行为数值模拟研究

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The confluence phenomenon is fairly common in the natural river. The research on the complicated and distinctive hydraulic behavior of confluence is of great practical and theoretic significance. The finite element model of Yangtze River and Jialing River is established based on two-dimensional depth-averaged surface-water flow and the hydraulic behavior at the confluence is investigated. The analysis shows that discharge ratio of mainstream to its confluent tributary is a crucial factor which dominates location of junction point, junction line and width of backflow zone near the lower reaches of confluence, the bigger is discharge ratio, the closer junction point is to shazui at Chaotianmen, the nearer junction line is on the side of Jialing River, and the smaller of width of backflow is. The water surface slope of the upper confluence depends on water level lifting up each other, when discharge ratio monish, the water surface slope of Yangtze River decreases, while the gradient of Jialing River increases. The water surface slope in the flow mixing region is direct proportional to Yangtze River's discharge and negative correlation to the discharge ratio.
机译：合流现象在天然河道相当普遍。在融合的复杂和独特的液压行为的研究具有重大的现实和理论意义。长江和嘉陵江有限元模型是基于二维的深度平均表面水流，并在汇合液压行为进行了研究确立。分析表明，主流其汇合支流的放电比是主宰结点，结线和回流区的宽度汇合下游附近的位置，更大的放电率，越接近连接点是沙嘴的关键因素在朝天门，越靠近接合线是嘉陵江侧，和宽度中的较小的回流是。上汇合的水面斜率取决于水位抬起对方，当放电率monish，长三角的水面斜率减小，而嘉陵江增加梯度。在流混合区域的水面斜率是直接正比于长三角的放电和负相关的放电比。

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