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Compound channel flow characteristics

Author: ChenChangYing
Tutor: ZhangXingNong
School: Nanjing Hydraulic Research Institute
Course: Hydraulic Engineering and River Dynamics
Keywords: Compound cross section Flow characteristics Flume tests Numerical calculation
CLC: TV133
Type: Master's thesis
Year: 2002
Downloads: 196
Quote: 3
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Abstract


Many rivers in China is still a lack of a sound governance , lower river flood capacity , frequent floods , which caused huge economic losses . Thus , flood control and disaster mitigation is a long-term and arduous task . Normal circumstances , the majority of our natural rivers have distinct beach slot compound cross section of the riverbed , dry season , the main tank discharge , floodplain , flood water after the formation of the compound channels flows by the effect Beach trough water blended with each other , the main slot over the water capacity is reduced. Ground roughness and beaches , the flow rate is relatively small , making the full-face velocity smaller the flood propagation time is longer , rising flood level . Therefore , the compound channels flow characteristics and hydraulic parameters of river flood capacity is particularly important , attaches great importance to the problem has been caused by the hydraulic scholars at home and abroad , and also the current engineering practice of China 's major rivers are urgently needed to resolve the issues . Flume experiments and numerical simulation of a combination of both methods , the compound channel flow characteristics . Through a review of existing research , a clear direction and goals of the study . According to the establishment of the two - dimensional flow model , the simulation of compound cross section transverse velocity distribution flume test data to be verified . And compound cross section transverse velocity distribution boundary shear stress distribution and variation of water flow , Beach groove width ratio of the Beaches roughness factors such as the impact of the cross-section over current capacity , as well as the beach slot Flow Distribution Calculation research . By analysis and comparison of the various influencing factors put forward their point of view . Research results for river training works and flood control planning project to determine the parameters of the fractographic optimization section design with a reference value .

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