摘要
荆江-洞庭湖关系演进和人类活动干扰导致洞庭湖区蓄洪垸内水系萎缩,削弱了农田渠系的农业灌溉和行洪排涝能力。采用基于景观生态学理论的水系连通性评价指标,包括河网密度、水系环度、节点连接率和水系连通度,定量评价洞庭湖区20个蓄洪垸内水系连通性的现状。结果表明:该20个蓄洪垸的总体河网密度、节点连接率和水系连通度良好,而水系环度偏低。针对3类蓄洪垸,提出不同的水系连通优化策略,以钱粮湖垸、屈原垸和安澧垸为示范案例提出优化工程思路。这3个蓄洪垸优化后河网密度分别提高5.09%、7.32%和10.63%,水系环度分别提高0.66%、16.67%和4.55%,节点连接率分别提高0.25%、3.99%和2.16%,水系连通度分别提高0.19%、4.35%和2.08%。本研究可为平原湖区蓄洪垸开展农田渠系连通工程,提升农业灌溉和治涝行洪能力提供参考。
The evolution of Jingjiang River-Dongting Lake connection and the interference of human activities lead to the degradation of water network in flood storage polders of the Dongting Lake area,resulting in the weakened ability of agricultural irrigation and flood drainage of the farmland ditch network.Based on the theory of landscape ecology,this study quantitatively evaluated the connectivity of the current water network in 20 flood storage polders using the evaluation indices of water network connectivity,including the river network density,the circle degree of water network,the node connection rate and the network connectivity. The results show that the overall river network density,the node connection rate and the network connectivity are high in these 20 polders,whereas the circle degree of water network is relatively low. The 20 polders were classified into three types,different optimization strategies for their water network connection were proposed accordingly and then implemented to the Qianlianghu,Quyuan and Anli flood storage polders. After the implementation of individual optimization strategies,the river network density of the three polders increased by 5. 09%,7. 32% and 10. 63%,the circle degree of water network increased by 0. 66%,16. 67% and 4. 55%,the node connection rate increased by 0. 25%,3. 99% and 2. 16%,the network connectivity increased by 0. 19%,4. 35% and 2. 08%,respectively.This study can provide some reference for the management of ditch network connection projects in flood storage polders of plain lake area,and the improvement of agricultural irrigation and flood control capacity.
作者
李凯轩
李志威
胡旭跃
王赞成
钱湛
LI Kaixuan;LI Zhiwei;HU Xuyue;WANG Zancheng;QIAN Zhan(School of Hydraulic Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Dongting Lake Aquatic Eco-environmental Control and Restoration of Hunan Province,Changsha 410114,China;Hunan Bestall Water Conservancy Construction,Co.,Ltd.,Changsha 410007,China;Hunan Hydro&Power Design Institute,Changsha 410007,China)
出处
《水资源与水工程学报》
CSCD
2020年第6期236-242,共7页
Journal of Water Resources and Water Engineering
基金
湖南省科技重大专项(2018SK1010)
国家自然科学基金项目(51709020)
湖南省教育厅重点项目(19A017)
湖南省自然科学基金项目(2020JJ3036)
长沙理工大学研究生“实践创新与创业能力提升计划”项目(SJCX201938)。
关键词
蓄洪垸
农田渠系
水系连通
灌溉排涝
洞庭湖区
flood storage polder
farmland ditch network
water network connection
irrigation and drainage
Dongting Lake area
