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| 河渠水面线推求方向的可行性研究 |
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刘曾美1,吴俊校2,陈明2
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1. 华南理工大学,水利水电工程系,广东,广州,510640
2. 广东省水利水电建设管理中心,广东,广州,510600
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| 摘要: |
| 河渠水面线的推求,首先必须确定推求方向,因为虽然从理论上可从上游或下游断面开始递推,但实际上都可能遇到无法推求的情况.构建的规则河渠水面线推求方向可行性分析方法,首先分析水面线计算式上、下断面能量函数曲线的特性,研究计算河段长度、河道底坡对其的影响;然后探讨上、下断面的能量函数曲线相对位置关系,从而探究无法推求的原因及求解的规律性,并以实例进行分析.研究结果表明,由下游向上游推求等截面缓坡、临界坡河段及收缩河段,或由上游向下游推求等截面陡坡、临界坡河道及扩散河段,总能找到可行解或通过缩短计算河段长度找到可行解;而由上游往下游推求等截面缓坡河段、收缩河段,或由下游向上游推求等截面陡坡河段、扩散河段时,则存在无解区域,且无解区域发生在临界流态的某一邻域内,邻域左右半径不一定相等;此外,河段长度愈长,坡度愈陡,邻域半径愈大. |
| 关键词: 水面线 推求方向 可行性 能量函数曲线 |
| DOI： |
| 分类号:TV133 |
| 基金项目:广东省防洪减灾研究项目 |
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| Feasibility study on the computational direction of flow profile of river and channel |
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LIU Zeng-mei1,WU Jun-xiao2,CHEN ming2
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LIU Zeng-mei1,WU Jun-xiao2,CHEN ming2(1.Department of Water Conservancy and Hydropower Engineering,South China University of Technology,Guangzhou 510640,China,2.Guangdong Province Water Conservancy and Hydropower Engineering Center for Supervision in Construction,Guangzhou 510600,China)
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| Abstract: |
| The computational direction must be decided first in computation of water surface profile of river and channel.Theoretically,it can be obtained from either the upstream cross-section or the downstream cross-section of the calculated reach.However,in practice,when the calculation is carried out from either the upstream cross-section or the downstream cross-section,it may often be encountered that the results can not be reached.The method for analyzing the feasibility of computational direction of water surfa... |
| Key words: flow profile computational direction feasibility energy function curve |
