采砂区布置对分汊河道的影响分析  

Analysis of effect of sand mining areas on braided channel

作　　者：张强[1] 张小峰[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2009年第2期153-157,共5页Engineering Journal of Wuhan University

基　　金：国家重点基础研究发展(973)计划资助项目(编号:2007CB714106);国家自然科学基金资助项目(编号:50579054)

摘　　要：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.A two-dimensional horizontal model is applied to simulate flow and sediment transport in the Tianxingzhou reach of the Yangtze River. The model is calibrated and verified by field data. The variation features of water distribution, water lever and flow are simulated by using different discharges under different relative distances from the bifurcation of the braided river. The results indicate that the water distri bution, water level and velocity in main channel increase firstly and then decrease with the increasing distance from the bifurcation of the braided river in the same conditions. As typical flow and sediment year, the year 2004 is also used to forecast the sediment change of the reach and the sediment re-silting efficiency in the sand mining areas after sand mining, the total volume of sediment decrease firstly and then increase with the relative distance of bifurcation, while the sediment re-silting efficiency has the other way. The results can provide scientific reference for the feasibility and the planning of sand mining.

关 键 词：平面二维水沙数学模型 采砂 分汉河道 分流比 泥沙回淤 

分 类 号：TV148[水利工程—水力学及河流动力学]