Assessment of flow regime of Zhoukou Section based on RVA method

The construction and operation of Zhoukou sluice on Shaying river has caused great changes in the flowing regime of the lower reach,which has a significant impact on the [JP2]structure and function of the water ecosystem in the basin.In order to evaluate the hydrological changes of Zhoukou reach quantitatively,daily runoff data of Zhoukou gauging station from 1951 to 2016 is selected,and the degree [JP]of 33 hydrological alteration indexes and their ecological influences before and after the construction of Zhoukou sluice in the middle reaches of Shaying river were evaluated through Ranges of Variability Approach (RVA) method.The results indicate that:(1) after 1975,the operation of Zhoukou sluice,human activities had an intensified influence on the flow regime of Shaying River,and the median value for each month showed a significant downward trend;(2) the overall degree of hydrologic alteration of Zhoukou gauging station is 414%, which is a moderate change,and the most significant changes occurred on the average flow in November,the timing of annual 1day minimum discharge and the flow fall rates,which were [JP2]strong changes;(3) The water supply and demand of Shaying River are in serious contradiction,and the operation and dispatching of sluice has adverse effects on the stability of water ecosystem.Therefore,it is urgent to carry out ecological restoration of Shaying River,adjust river flow timely,and realize coordinated development of regional economy and water ecosystem.

Project Supported:

Clc Number: