| 地形和径潮条件变化对东江三角洲洪季连通性影响 |
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| 引用本文： | 余明辉,王睿璞,陈小齐,刘长杰,刘画眉.地形和径潮条件变化对东江三角洲洪季连通性影响[J].水科学进展,2021,32(5):759-769. |
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| 作者姓名： | 余明辉 王睿璞 陈小齐 刘长杰 刘画眉 |
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| 作者单位： | 1.武汉大学水资源与水电工程科学国家重点实验室, 湖北 武汉 430072 |
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| 基金项目： | 国家重点研发计划资助项目2016YFC0402606国家自然科学基金资助项目11972265 |
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| 摘 要： | 河流连通性是河流生态系统的基本特征，具有季节差异的同时也受人类活动干预。建立一维水动力模型计算1999—2009年间人为扰动后地形改变和径潮条件变化对东江干流博罗—石龙河段及东江三角洲洪季连通性的影响。结果表明:东江干流及东江三角洲水系成环发育程度较低，河道共享性较高，平均节点连接率大于1；地形下切和径潮条件变化未改变结构连通性；输运连通性既受河道地形变化的影响，也受径潮条件变化的影响，其中河道地形下切使水量传输能力减小，河流输运连通性减弱；径流增大及外海潮动力减小均导致水量传输能力增大，河网输运连通性增强。研究成果可为东江三角洲防洪、水利工程规划及水生态环境等研究提供科学依据。
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| 关 键 词： | 连通性 地形变化 径潮动力 图论 采砂 东江三角洲 |
| 收稿时间： | 2020-11-04 |
Effects of riverbed evolution and fluvial-tidal dynamics change on river connectivity during flood season in the Dongjiang River Delta |
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| Institution: | 1.State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China2.Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510635, China3.Shenzhen Urban Public Safety and Technology Institute, Shenzhen 518000, China4.Harbin Institute of Technology(Shenzhen), Shenzhen 518000, China |
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| Abstract: | River connectivity, a fundamental property of river ecosystem, is affected by human activities as well as seasonal differences. A one-dimensional river network mathematical model was established to evaluate the impact of riverbed evolution and fluvial-tidal dynamics change on river connectivity during flood season in the lower reaches of Dongjiang River from Boluo to Shilong and Dongjiang River Delta (DRD) from 1999 to 2009. The results show that the loopiness of the study area was low, the linking sharing index was high and node connection rate was greater than 1, which indicated a relatively high topological connectivity. Noticed that the topological connectivity did not change with the uneven riverbed downcutting and fluvial-tidal variation. However, the dynamic connectivity has changed significantly with the uneven riverbed downcutting and fluvial-tidal variation. Due to the riverbed downcutting, fluvial dynamics decreased and tidal dynamics increased, with the decrease in the water conveyance capacity and dynamic connectivity of the study area. The results obtained from this study provides scientific supports for the research on water security such as flood control, water conservancy project planning and water ecological environment in the DRD. |
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