Study Of Discharge Mutual Influence Of Bifurcated River In Huaihe River To Yangtze River

Bifurcated river discharge on the one hand is related to discharge speed, on the other hand the related to stability. Analysis for scientific and reasonable control discharge, the paper combines the Huaihe River to Yangtze River model test, research the flow diversion ratio and stability of bifurcated river. Flow diversion ratio is an important parameter of bifurcated river and the flow diversion ratio variation may lead to the evolution of bifurcated river, flow increase occur scour even collapse endanger the safe of the people on both sides; the evolution of the main bifurcated river easily lead to siltation, flow decreases, or endanger the water supply and water traffic. Huaihe River to Yangtze River locates in human activity place, gathering much farming, industry and the third industry. Thus, research into the flow diversion ratio of Huaihe River to Yangtze River, not only has important significance in theory, but also has direct guiding to the actual project. The establishment of Huaihe River to Yangtze River middle and lower river model, increase river model roughness according to calendar year typical measured data, using sand, bottom noodles and mesh. Theory analysis based on the collected data of water level and discharge, the different slice opening combination, surface flow pattern, system analysis the optimal flow diversion ratio and optimal slice opening combination.1. The main bifurcated river downstream water level increases with upstream level increases and water level difference decreases in the same discharge. With the discharge increases, water level difference decreases in the same downstream water level.2. Without sluice control, the main bifurcated river level higher than the minor level, farther and farther away from the main river lower in the same discharge. The braided river diversion ratio is unchanged under different downstream water level. The main bifurcated river flow diversion ratio decreases with the discharge increases. The two minor bifurcated rivers flow diversion ratio is same, and increases with the discharge increases.3. Single sluice controlling, the main bifurcated river flow diversion ratio decreases with the discharge increases in the same slice opening. The two minor bifurcated rivers flow diversion ratio is same, and increases with the discharge increases. The minor bifurcated river slice opening regulation has large influence on itself, changed section from the main bifurcated river, wich has little influence on the other the minor bifurcated river.4. Double sluice controlling, the main and the minor bifurcated river combination regulate, the main bifurcated river flow diversion ratio is the same to single sluice control. The minor bifurcated river flow diversion ratio increasing or decreasing section is from the main bifurcated river, has no influence on other minor bifurcated river. Two minor bifurcated rivers combination regulate, each flow diversion ratio increasing or decreasing section is from the main bifurcated river. The two minor bifurcated rivers have no interactions.5. Water flow velocity is small, backflow occur in the bend when the slice opening is small of the main bifurcated river. The minor bifurcated river velocity is big, which bring serious scour and high water level, the most dangerous operating condition. The backflow occour in the bifurcation of minor bifurcated river, when regulate the minor bifurcated river slice. The low water level and backflow also occour in the bifurcation of opening slice. So, the best slice opening is 2/3 of the only main bifurcated river, and the best flow diversion ratios are 76%,12% and 12%, which ensure bifurcation not siltation, not scouring and adequate water level.