新疆宽浅变迁河流桥渡动床模型设计探讨  

Study on the physical model design of movable bed of broad-shallow shifting reach in Xinjiang Region

作　　者：杨胜发[1] 胡江[1] 金炜[1] 

机构地区：[1]重庆交通大学河海学院,重庆400074

出　　处：《泥沙研究》2008年第3期43-50,共8页Journal of Sediment Research

基　　金：交通部西部建设重点科技项目(2001-318-365-88)

摘　　要：结合新疆宽浅变迁河流特性,分析了变态率和轻质沙对新疆宽浅变迁河流桥渡动床模型的影响,认为新疆宽浅变迁河流桥渡动床模型最好采用平面比尺小于20、模型沙为天然沙的"自相似"正态动床模型。以代表性河流为例,说明标准的"自相似"动床模型将遇到模型场地及进出口边界控制等困难,提出采用局部模型设计思路。通过分析新疆宽浅变迁河流的地形特点、局部模型中桥位断面不同宽度和沿程单宽流量偏差对代表性河流的水流及地形变化的影响,认为局部模型方法能模拟代表性河流建桥后桥位断面地形和水位的变化。Based on characteristics of broad-shallow shifting reach in Xinjiang region, the movable bed model design was studied in this paper. By analyzing the influence of distorted scale and lightweight sand, the ＂self-similar model＂, nature sand, and small model scale was recommended in the typical river. Due to the limitation of model field and difficulty of hydraulic boundary in the ＂self-similar model＂ design, the method of the partial model was put forward. By analyzing the influence of different width of the bridge section and the error of the unit discharge in the typical river, the evolvement of bed form and back water in bridge section can be simulated in partial model.

关 键 词：新疆宽浅变迁河流 桥波动床模型 “自相似”模型 局部模型 

分 类 号：TV131.616[水利工程—水力学及河流动力学]