【摘要】 长江荆南四口水系是连接长江与洞庭湖的重要通道,其防洪排涝、水资源利用、水环境保护等问题一直是国内外关注的重点。通过调查本地区防洪排涝、水资源利用、水环境保护等工程现状,具体分析存在的水安全问题,提出了本地区水安全主要评价指标,包括控制灾害类、水供需矛盾类、生态环境类和水价值类指标。基于本地区水文特性和现有水工程现状分析研究,结合社会经济发展规划和各专项规划,提出长江荆南四口水系主要评价指标及安乡代表站相应的安全阈值分别为:(1)防洪评价指标为重现1954年洪水情况下安乡站最高水位不超过39.38 m;(2)安乡站最大3日暴雨达到212 mm时不出现明显涝灾;(3)主要灌溉期安乡站水位保证不低于29.50 m;(4)各时段四口来流满足生态流量要求;(5)各河段水质满足Ⅲ类水质要求;(6)安乡站全年满足最低通航水位28.71 m,并对阈值成果的合理性作了讨论。研究成果可为长江荆南四口水系地区综合治理和保护方案确定提供技术支撑。更多还原

【Abstract】 The Jingnan Four-inlet Regions of Yangtze River are located in the connecting part of Yangtze River and Dongting Lake. Due to special geographical locations,topographical conditions and water security problems in reality,regional flood control,drainage,water resource utilization and water environment protection have become a hot topic. Based on an analysis and study of the above issues,this paper summarizes and concludes the key evaluation index of water security,including the types of disaster control,water supply,ecological environment and water value in the Jingnan Four-inlet Regions of Yangtze River. Based on the hydrologic characteristics and current situation of various water projects in the Jingnan Four-inlet Regions and according to the social economic development planning and other special plannings,this paper proposes the key evaluation index in the Jingnan Four-inlet Regions of Yangtze River and the security threshold value of Anxiang station including:(1)Flood control evaluation index is,when the flood of 1954 year happen,that the highest water level value of Anxiang Station would not exceeded 39.38 m.(2)No obvious waterlogging occurs when the value of maximum 3-day rainstorm reaches 212 mm in Anxiang Station.(3)During the key irrigation period,the water level value of Anxiang Station shall not be lower than 29.50 m.(4)In each period,the flows in the Four-inlet Regions meet the requirements of ecological flow.(5)The water quality in each river meets the requirements of Class Ⅲ.(6)The water level value in Anxiang Station meets the requirements of minimum navigable water level value of 28.71 m. The paper also discusses the rationality of these threshold results. Such results provide scientific support for making the determination of comprehensive control,development and protection programme in the Jingnan Four-inlet Regions of Yangtze River.更多还原