PIANC Smart Rivers 2022

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River ecological flow (water level) is a basic indicator to maintain the ecological function of the river and control the development intensity of water resources.It is an important basis for coordinating the water consumption of life, production and ecology, and has a fundamental and pre-eminent important position in the allocation and scheduling of water resources. Nantong City is a typical plain river network area. In this paper, under the condition of mastering the river system of Nantong, the status quo of water resources development and utilization, and basic hydrological data, through method comparison, the annual minimum water level method was used to determine the ecological water levels of 13 rivers preliminarily including Jiuwei Port River and formulated corresponding safeguard measures with "one river, one policy". The ecological water level was assessed according to the "Technical Guidelines for Monitoring and Evaluation of Ecological Water Level (Flow) (Trial)" issued by the Jiangsu Provincial Department of Water Resources. The management and control measures were put forward from four aspects, such as finding out the water resources and water ecology in the jurisdiction and determining the ecological water level (flow) target scientifically. 
The next step is to select the appropriate ecological flow (water level) calculation method according to the mobilization and operation of various water conservancy projects and the water intake of the river, and scientifically determine the target value of the ecological flow (water level) of the river. The paper provided a reference to carry out the determination of river ecological flow (water level) in the plain river network area.

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