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以长江天兴洲河段为例,应用平面二维水沙数学模型,采用实测水沙数据进行率定与验证,模拟了不同流量级下采砂区相对分汊口距离不同采砂后分流比、水位和流速变化规律,模拟结果表明,在相同水流条件下,随着采砂区距分汊口距离的增加,采砂后主汊分流比与河段水位和流速变化都呈先增后减的规律.进一步选取2004年作为典型水沙年预测采砂后河段冲淤变化和回淤率,预测结果表明,河段总的冲淤量随着采砂区相对分汊口距离的增加呈先减后增的规律,而采砂区回淤率呈先增后减的规律.模型成果可为本河段采砂的可行性和采砂规划控制提供科学依据.
Taking the Tianxingzhou section of the Yangtze River as an example, the plane two-dimensional mathematical model of water and sediment was applied to verify the data of water and sediment measured at different flow regimes. , Water level and flow rate. The simulation results show that under the same water flow conditions, with the increase of the sand mining area distance from the points, the main 汊 diversion ratio and the water level and flow rate change after the sand mining increase first and then decrease The prediction of the ebb and flow changes and the rate of back silting in the reach after sand mining are also selected as the typical years of water and sediment prediction.The results show that the total amount of scouring and silting in the reach increases with the increase of the distance to the mouth of the sand mining area First decrease and then increase, while the rate of returning sediment in the sand mining area increases first and then decreases.The results of the model can provide a scientific basis for the feasibility of sand mining and the control of sand mining planning in this section.