武穴长江大桥定床河工模型试验(初稿)——平妍容

Fixed bed hydraulic model of WuXue Yangtze river bridge
College： School
of
Water
Resources
and
Hydropower Subject： Habor
Engineering and River Engineering
Coastal
3
scale choice, and similarity validation about velocity distribution, water line, split ratio. After the model up to the standard on similarity validation, we use five typical flows to experiment the four bridge type separately. Then observe and analysis the change of water level, cross-section velocity distribution, mainstream line position, unit discharge distribution, direction of flow, backwater degree and its influence basin and so on of the stream segment where the bridge site due to the bridge construction. At last, according to the experiment result, with the basic theory in river dynamics and sediment movement, the paper analysis the possible change after the bridge build, and the possible effect on river regime, flood control, shipping and so on. Keywords: Yangtze Bridge fixed bed physical model flood control shipping
第二章 武穴长江大桥河工模型设计与验证
2.1 模型概况 ..................................................... 10 2.1.1 模型模拟的范围 ........................................... 10 2.1.2 模型设计依据的资料 ....................................... 10 2.2 模型设计 ..................................................... 11 2.2.1 模型几何比尺 ............................................. 11 2.3 模型加糙 ..................................................... 12 2.4 模型验证 ..................................................... 13 2.4.1 水面线验证 ............................................... 13 2.4.2 流速分布验证 ............................................. 14 2.4.3 分流比验证 ............................................... 17
关键字：长江大桥
定床河工模型
水流运动变化
2
防洪
航运
Abstract
The proposed HuBei province Yangtze River Bridge is located in the middle and lower reaches of Yangtze River. It’s located in WuXue city in HuBei province and JiuJiang city in JiangXi province. It’s the planning river channel of the highway between MaCheng and RuiChang. It’s the connection of MaZhu highway, HuRong highway, DaGuang highway, WuYing highway, HuYu highway, HangRui highway and lots of provincial road and county road. It’s the inter-provincial fast channel that link the northeast,west,north of Hubei province to southeast of China like Jaingxi and Fujian. Building the Yangtze river bridge will change the local boundary conditions of stream segment where the bridge stands. It also will cause the river bed scouring and depositing processes. To study the impact on the flow condition of the segment where the bridge stands caused by the proposed bridge as well as the change of river regime and the scouring and depositing processes of the section where the bridge located, especially the effect of flood control and shipping caused by the proposed bridge, commissioned by related organization, Wuhan university and Hydrological Office of Yangtze Water Resources Committee undertake the river model test of the stream segment where the bridge stands in GuoXiang city. The graduation design’s main content using the analysis of the field data and fixed bed physical model test data and combine the theoretical analysis method , grasps the water flow movement characteristics before and after the WuXue Yangtze bridge built on middle Yangtze river reach, and analysis the possible effect of the river regime, shipping, flood control and so on. This paper is mainly as follows: Firstly, this paper introduces the construction background of the proposed WuXue Yangtze Bridge and the general situation of the stream segment where the bridge stands. Then we analysis and summaries the mechanism and rules of the bridge’s influence. The next is about this subject’s research contents, methods and technical route. According to the provided measured terrain, hydrologic data, we designed and verified the river model, including determining the simulation context, the model
change of water flow movement
4
目
第一章 概述
录
1.1 研究背景与意义 ................................................ 1 1.1.1 拟建武穴长江大桥概况 ...................................... 1 1.1.2 桥址河段概况 .............................................. 1 1.1.3 问题的提出 ................................................ 5 1.1.4 研究意义 .................................................. 5 1.2 研究现状 ...................................................... 5 1.2.1 桥梁影响的机理和规律研究现状 .............................. 5 1.2.2 研究桥梁影响的的方法及其现状 .............................. 6 1.3 本文研究内容及技术路线 ........................................ 9 1.3.1 研究内容与方法 ............................................ 9 1.3.2 技术路线 .................................................. 9