大比降卵砾石河流防护结构的冲刷深度研究  

Scour depth of preventive configuration of gravel river with high gradient

作　　者：刘勇 杨胜发[2] 张毅 张帅帅 

机构地区：[1]长江重庆航运工程勘察设计院,重庆401174 [2]重庆交通大学河海学院,重庆400074

出　　处：《水运工程》2015年第6期111-114,共4页Port & Waterway Engineering

基　　金：国家科技支撑计划项目(2012BAB05B02)

摘　　要：大比降卵砾石河流河床形态及水流条件特殊,治理难度相当大。当遇到较大的洪水时,堤防工程、公路等临河设施常发生水毁,而关于此类河流的研究成果较少。针对大比降卵砾石河流河床宽浅、滩槽不分、比降和流速大、枯水期水流分散易形成股流冲刷的特点,布置了不同床沙组成、冲刷角度、河床比降及流量的概化模型试验。通过对81组室内试验资料进行单因素分析,得知冲刷深度(Hp)与单宽流量(q)、河道比降(J)、冲刷角度(θ)成正比,与河床质颗粒组成(D)成反比。采用量纲分析法和多元回归分析法得到了冲刷深度的计算表达式。It is difficult to regulate the high-gradient gravel river condition. The facilities over the river such as levee engineering and bank serious flood, but the research on it is less. The high-gradient gravel river indistinguishable shallow and channel, steep gradient, large flow velocity due to the special bed form and flow protection project are often damaged at is characterized by shallow water depth, and plume easily formed when flow is dispersed in the dry season. According to the scour features, we design the generalized model test about different bed material gradation, different scour angle, different riverbed gradient and different discharge. Based on the single factor analysis, we find out main influential factors with 81 groups of experimental data that the scour depth （Hp） is proportional to the single discharge （q）, the channel slope （J）, and the scour angle （0）, and it is inversely proportional to the composition of bed material particles （D）. By the dimensional analysis and multivariate regression analysis methods, we achieve the simple formulas about scour width and scour depth for the high-gradient gravel river.

关 键 词：大比降卵砾石河流 冲刷深度 河道治理 

分 类 号：U617[交通运输工程—船舶及航道工程]