| 洞庭湖区水系格局及连通性优化 |
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| 引用本文： | 黄草,陈叶华,李志威,沈小雄,谭岚.洞庭湖区水系格局及连通性优化[J].水科学进展,2019,30(5):661-672. |
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| 作者姓名： | 黄草 陈叶华 李志威 沈小雄 谭岚 |
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| 作者单位： | 1.长沙理工大学水利工程学院, 湖南 长沙 410114; |
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| 基金项目： | 国家自然科学基金资助项目（51709019）；湖南省科技重大专项资助项目（2018SK1010） |
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| 摘 要： | 江湖关系演变及强烈人类活动改变了洞庭湖区的水系格局与连通性，加剧了湖区水环境与水生态的恶化形势，开展水系格局与连通性研究是洞庭湖区水系综合整治和河湖生态修复的重要内容。基于景观生态学中网络连通度分析方法，建立了水系格局与连通性评价指标体系，包括河频率、河网密度、水系环度（α）、节点连接率（β）和网络连接度（γ）等，分析评价了洞庭湖不同片区现状及规划水系格局与连通性的差异以及合理性，提出了水系连通规划的优化方案。结果表明:现状洞庭湖区水系格局和连通性总体较好，但各个片区存在较大差异，湘-资水尾闾地区的现状水系格局和连通性良好，北部地区和松澧地区的现状水系格局与连通性较差。松澧地区水系规划方案改善了该地区的水系格局与连通性，但北部地区的规划方案并不合理。经过比选与优化，北部地区的α、β、γ指标比现状提高了13.2%、6.9%和4.7%，比原规划方案提高26.0%、9.4%和9.4%。
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| 关 键 词： | 水系格局 水系连通性 水系结构 连通性指标 洞庭湖区 |
| 收稿时间： | 2019-02-20 |
Optimization of water system pattern and connectivity in the Dongting Lake area |
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| HUANG Cao,CHEN Yehua,LI Zhiwei,SHEN Xiaoxiong,TAN Lan.Optimization of water system pattern and connectivity in the Dongting Lake area[J].Advances in Water Science,2019,30(5):661-672. |
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| Authors: | HUANG Cao CHEN Yehua LI Zhiwei SHEN Xiaoxiong TAN Lan |
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| Affiliation: | 1.School of Hydraulic Engineering Changsha University of Science&Technology Changsha 410114 China;2.Hunan Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration Changsha 410114 China;3.Hunan Bestall Water Conservancy Constructure Co. Ltd. Changsha 410007 China |
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| Abstract: | As the (Yangtze) River-(Dongting) Lake relationship changed and human activities increased,the water system pattern and connectivity in the Dongting Lake area have been also changed a lot,which exacerbated the deterioration of water environment and water ecology. Carrying out the researches on water system patterns and connectivity are important for the comprehensive improvement and ecological restoration of water systems of the Dongting Lake. Based on the network connectivity analysis method in landscape ecology,we created an evaluation index of water system pattern and connectivity including river frequency,river network density,circle degree of water system (α),node connection rate (β),and network connectivity (γ). Here,we analyze the current water system pattern and connectivity of the Dongting Lake Area compared to a planned water system,and we propose an optimized planning scheme for the studied water system. Our results demonstrate that the water system pattern and connectivity of the total area of the Dongting Lake are acceptable,but that there are large differences among sub-areas. The pattern and connectivity of the existing water system in the tail-stream area of the Xiangjiang and Zishui Rivers are at an acceptable level but are poor in the Song and Li Rivers area and the northern region of the Dongting Lake. The planned project will improve the water system connectivity efficiently in the Song-Li Rivers area,but not in the northern region. In the northern region,according to our optimized planning scheme,three indices (α,β,γ) increased by 13.2%,6.9% and 4.7%,respectively,compared to the existing water system,and our optimized planning scheme yielded an improvement of the proposed plan by 26%,9.4%,and 9.4%,respectively. |
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| Keywords: | water system pattern water system connectivity water system structure connectivity index Dongting Lake area |
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