| 长江下游典型平原城市感潮河网水动力提升分析 |
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| 引用本文： | 王思如,顾一成,杨大文,孙金华,胡庆芳,张熹.长江下游典型平原城市感潮河网水动力提升分析[J].水科学进展,2022,33(1):91-101. |
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| 作者姓名： | 王思如 顾一成 杨大文 孙金华 胡庆芳 张熹 |
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| 作者单位： | 1.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(2018YFC0407205);国家自然科学基金资助项目(7181101209)。 |
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| 摘 要： | 通常平原城市河网水动力条件较差，加快水体更新、增强水体的流动性可改善河网水环境质量。以长江下游典型平原城市启东市为例，充分利用河道天然潮动力条件，建立河网水动力学模型，通过数值模拟试验，量化分析优化水系格局、工程布局和调度方式对河网水体流动性的改善程度。结果表明:在最不利潮汐条件下，优化方案可将河网的全历时生态流速达标率由52.3%提升至94.2%，最大瞬时生态流速达标率由42.6%提升至85.0%，区域生态流速持续度达91.8%，同时还可节约67.5%的引调水量；改善水系格局、优化河网控制工程布局及其调度方案可以减少域外引水，同时显著增加河网水流更新速率，降低污染物滞留时间，从而改善水环境。该方法可为提升平原城市感潮河网水环境质量提供新手段。
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| 关 键 词： | 水动力提升 感潮河道 数值模拟 Infoworks ICM 平原城市 |
| 收稿时间： | 2021-05-06 |
Study on hydrodynamic improvement of urban tidal river for a typical plain cities in the lower reaches of Yangtze River |
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| WANG Siru,GU Yicheng,YANG Dawen,SUN Jinhua,HU Qingfang,ZHANG Xi.Study on hydrodynamic improvement of urban tidal river for a typical plain cities in the lower reaches of Yangtze River[J].Advances in Water Science,2022,33(1):91-101. |
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| Authors: | WANG Siru GU Yicheng YANG Dawen SUN Jinhua HU Qingfang ZHANG Xi |
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| Institution: | 1.State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China2.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China3.Qidong housing and Urban Rural Development Bureau, Qidong 226200, China |
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| Abstract: | The hydrodynamic of river channels in plain cities are generally of poor conditions. Accelerating water renewal and strengthening orderly flow is one of the most important ways to improve the water environment quality of river network. In this paper, a typical plain city in the lower reaches of the Yangtze River, Qidong, was studied as an example. Making full use of the natural tidal dynamic conditions, a hydrodynamic model of the river network was established. Numerical simulation experiment was carried out to quantify the improvement of hydrodynamic characteristics of the river network through water system pattern and overall arrangement optimization and water conservancy project operation. The results show that, the optimized scheme increases the ecological velocity compliance rate of the river network from 52.3% to 94.2% for the whole period under the worst tidal condition;the maximum instantaneous ecological velocity compliance rate is raised from 42.6% to 85.0%;the regional ecological velocity continuity increases to 91.8%. Meanwhile, the urban ecological water consumption reduces 67.5%. Under the optimized scheme, the diversion water volume from external regions can be reduced, and the renewal rate of urban river network significantly increases which shrinks the accumulation time of pollutants. This study provides a novel perspective and method for improving the water environment of tidal river channels in plain cities. |
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| Keywords: | hydrodynamic optimization tidal river numerical simulation infoworks ICM plain cities |
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