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| 洞庭湖响水坎险滩的演变及成因分析 |
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胡旭跃1,程永舟1,陈健强2,沈小雄1,余得清3
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1. 长沙理工大学,河海工程学院,湖南,长沙,410076
2. 湖南省航务管理局,湖南,长沙,410005
3. 湖南省遥感中心,湖南,长沙,410007
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| 摘要: |
| 应用遥感地质和水动力演变分析法，分析了洞庭湖响水坎滩险的成因．探讨了影响湖区跌坎形成的水文和地质因素、水动力学条件及跌坎上、下游河床演变情况．地层岩性与沉积厚度的突变、地质构造单元分布等，是响水坎形成原始河床跌坎的内在原因，原始跌坎是出现跌水的前提，河湖边界及水流动力作用是跌水存在的外在条件，河湖水文组合决定了响水坎滩段是否碍航． |
| 关键词: 跌水 滩险 演变 遥感影像 地质成因 水动力条件 洞庭湖 |
| DOI： |
| 分类号:TV147 |
| 基金项目:交通部科技攻关项目 |
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| Analyses on origin and evolution of Xiangshuikan rapids in the Dongting Lake |
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HU Xu-yue1,CHENG Yong-zhou1,CHEN Jian-qiang2,SHEN Xiao-xiong1,YU De-qing3
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| Abstract: |
| The origin of Xiangshuikan rapids in the Dongting Lake is analyzed by using remote sensing geological and hydrodynamic methods. The effect factors of water steepfall in hydrology, geology and hydrodynamics, and the fluvial process upstream and downstream of the steepfall are discussed. It can be seen that the mutation of strata lithologic and sedimentation thickness, and the geologic structural unit distribution are the internal causes of the original bed falling-step formation. The precondition of the water fall is the original bed falling-step; the external conditions of the water fall are the lake boundaries and dynamic action of flow; and the combination of hydrological conditions decides whether the Xiangshuikan rapids obstructs navigation. |
| Key words: water fall rapids evolution remote sensing image geological origin hydrodynamic condition the Dongting Lake |
