| 小浪底水库淤积形态数值模拟 |
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| 引用本文： | 假冬冬,王远见,江恩惠,邵学军,张幸农.小浪底水库淤积形态数值模拟[J].水科学进展,2020,31(2):240-248. |
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| 作者姓名： | 假冬冬 王远见 江恩惠 邵学军 张幸农 |
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| 作者单位： | 南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210029;黄河水利委员会黄河水利科学研究院,河南郑州450003;清华大学水沙科学与水利水电工程国家重点实验室,北京100084 |
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| 基金项目： | 国家重点研发计划资助项目2018YFC0407402国家自然科学基金资助项目51579151 |
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| 摘 要： | 水库淤积形态是影响库容分布、水库排沙的一项重要因素。小浪底水库近坝段淤积泥沙粒径极细,具有流动性,针对其细颗粒泥沙淤积特点,揭示了水库细颗粒淤积物的流变特性与流型特征;通过引入水、淤积物、床面之间的界面受力分析,构建了细颗粒淤积物失稳流动描述模式,并与水沙输移模型相耦合,建立了考虑细颗粒淤积物流动特性的水库淤积形态模拟方法,在此基础上对小浪底水库淤积形态进行了验证分析。研究结果表明:低密度细颗粒淤积物为宾汉型流体,淤积平衡坡降较小,当其密度大于1.25 g/cm 3后,流动性快速减弱;考虑细颗粒淤积物流动特征的水库淤积形态模拟结果与实测结果吻合较好。研究成果可为水库淤积形态形成机理及其对水沙调控的响应研究提供技术支撑。
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| 关 键 词： | 淤积形态 细颗粒泥沙 数值模拟 小浪底水库 |
| 收稿时间： | 2019-06-26 |
Numerical study on the sedimentation pattern of Xiaolangdi Reservoir on the Yellow River |
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| JIA Dongdong,WANG Yuanjian,JIANG Enhui,SHAO Xuejun,ZHANG Xingnong.Numerical study on the sedimentation pattern of Xiaolangdi Reservoir on the Yellow River[J].Advances in Water Science,2020,31(2):240-248. |
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| Authors: | JIA Dongdong WANG Yuanjian JIANG Enhui SHAO Xuejun ZHANG Xingnong |
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| Affiliation: | 1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China2.Yellow River Institute of Hydraulic Research, YRCC, Zhengzhou 450003, China3.State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | Sedimentation pattern is one of the important factors affecting reservoir capacity and reservoir sediment flushing. In the near-dam area of Xiaolangdi Reservoir on the Yellow River, fine-grained muddy deposits are easy to flow like fluid. In this paper, the rheological property and flow pattern of muddy deposits were investigated. It was found out that the flow pattern of low density muddy deposits is that of Bingham flow, and its fluidity will decrease quickly when its density exceeds 1.25 g/ cm3. Base on analysis of shear stresses at interfaces between water and muddy deposits and between muddy deposits and channel bed, governing equations for the movement of muddy deposits were established. A simulation method for fine-grained sedimentation processes was developed by coupling the model for water flow and sediment transport with the model for muddy deposits movement. Calculation results indicate that sedimentation pattern of fine-grained particles in the Xiaolangdi Reservoir can be simulated accurately by considering the effect of muddy deposits movement. This investigation could improve our understanding of sediment deposition mechanisms in reservoirs, especially for fine-grained sediment. |
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| Keywords: | sedimentation pattern fine-grained sediment numerical simulation the Xiaolangdi Reservoir |
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