强人类活动作用下岷江都江堰河段水沙运动响应及河流形态重塑机制

Dujiangyan hub project is based on the characteristics of water and sediment of minjiang river, river bed morphology, water and flood control needs, long-term water management process in the formation of one of the oldest water conservancy project, has been more than 2,200 years, still play an important social and economic benefits. In recent decades, under the double effects of strong human activities and changes of natural conditions, the law of water and sediment movement at Dujiangyan reach of Minjiang River, evolutions of gravel beach group and fluvial morphology have undergone fundamental changes, the results certainly lead to significant influences on the diversion of flow-sediment movement of the dujiangyan hub, flood control for Chengdu plain and natural heritage protection of Dujiangyan project. This project will be based on the field investigation and series of experiment for the Dujiangyan reach of Minjiang River. Through the theoretical analysis of river dynamics, river morphology and the numerical simulation, the applicants will investigate the law of gravel bed-load movement, interaction of flow and sediment movement at Baisha River and Minjiang River confluence zone, evolution of fish mouth upstream gravel beach group, changes of fluvial morphology and flow-sediment diversion ratio of Dujiangyan hub under the strong human activies such as the projects’ operation of Zipingpu Reservoir and Chengdu City emergency water source Moer reservoir. The interaction of water and sediment movement and river morphological remodeling at Dujiangyan reach of Minjiang River under the strong human activities will be systematically clarified in this project. The forgoing research contents will provide theoretical and technical support for water diversion and sediment control of Dujiangyan hub, flow-sediment disaster prevention at Dujianyan reach and chengdu plain, and humanistic landscape protection.

都江堰枢纽工程是人们根据岷江来水来沙、河床形态、用水及防洪需求，在长期治水过程中形成的最古老的水利工程之一，至今已2200余年，仍发挥着巨大的社会经济效益。近几十年来，在人类活动和自然条件的双重作用下，岷江都江堰河段的水沙运动、洲滩发育、河流形态演变规律已发生了本质改变，必将对都江堰枢纽的分水分沙、成都平原的引水防洪及世界自然遗产保护产生重大影响。本课题以岷江都江堰河段野外调查与系列试验为基础，利用河流动力学、河流地貌学等理论方法和水沙运动数值模拟技术，突出研究岷江紫坪铺控制性水库和成都市应急水源地磨儿潭水库运行条件下，岷江都江堰河段内外江卵石推移质运动、白沙河与岷江交汇区水沙运动、鱼嘴上游卵石滩群演变格局、河流形态变迁及都江堰枢纽分水分沙规律。系统揭示强人类活动作用下的岷江都江堰河段水沙运动响应及河流形态重塑的相互作用，为岷江都江堰河段枢纽引水防沙、灾害防治及人文景观保护提供理论与技术。

都江堰枢纽工程是我国最古老的水利工程之一，至今已2200余年，在人类活动和自然条件的双重作用下，岷江都江堰河段的水沙运动、洲滩发育、河流形态演变规律已发生了本质改变。本项目以岷江都江堰河段野外调查与试验为基础，利用河流动力学、河流地貌学等理论方法和水沙数值模拟技术，掌握了该河段床沙组成及河势变化特征，提出了漂石植被洲滩发育的4个典型阶段，揭示了漂石植被洲滩作用下的水沙运动、汊道分流及洲滩演变特点，数值反演了紫坪铺、磨儿潭建库前后干支流不同来水来沙条件下岷江都江堰河段交汇区、洲滩区、鱼嘴区域及内江宝瓶口水沙输移规律及洲滩演变规律，该成果可为岷江都江堰河段引水防沙、灾害防治及人文景观保护提供理论与技术。项目研究期间共发表学术论文19篇（其中SCI收录论文9篇；EI收录论文4篇；核心期刊论文1篇；会议论文5篇），培养硕博士研究生毕业11名，获国家发明专利授权3项，项目成员参加及邀请国外人员开展国内外学术交流10次。