长江小黄洲演变对下游汊道分流特性的影响

Influence of evolution of Xiaohuangzhou bifurcated reach on flow-dividing characteristics of downstream bifurcated reaches of Yangtze River

在长江小黄洲汊道水流特性和河床演变特点分析的基础上,结合二维水流数学模型计算成果进行小黄洲演变对下游新济洲汊道段影响研究。结果表明:小黄洲汊道的演变对下游新济洲汊道段的水流特性有明显影响,在现状河道条件下,若小黄洲左汊衰退,可导致新生洲、新济洲左汊衰退,新潜洲左汊发展;若小黄洲左汊进一步发展,可导致新生洲、新济洲左汊发展,但对新潜洲左汊影响较小。

Based on analysis of the flow-dividing characteristics and riverbed evolution of the Xiaohuangzhou bifurcated reach of the Yangtze River, the influence of the evolution of the Xiaohuangzhou bifurcated reach on the Xinjizhou bifurcated reach downstream of the Yangtze River was studied using a mathematical model. According to the results, the evolution of the Xiaohuangzhou bifurcated reach has a significant influence on the flow-dividing characteristics of the downstream Xinjizhou bifurcated reach. In the current situation, the recession of the left branch of the Xiaohuangzhou bifurcated reach will lead to the recession of the left branches of the Xinshengzhou and Xinjizhou bifurcated reaches and development of the left branch of the Xinqianzhou reach, while development of the left branch of the Xiaohuangzhou bifurcated reach will lead to development of the left branches of the Xinshengzhou and Xinjizhou bifurcated reaches and a small change in the left branch of the Xinqianzhou bifurcated reach.