Study On The Reatoration Of Yufuhe River

River restoration embraces a great variety of ecological and engineering measures to improve rivers' ecological function, maintain river biodiversity and protect ecological environment. Though, there have been some research and successful engineering practices in China, relative research on northern seasonal rivers are less. So, it is of great theoretical and realistic significance to carry out research on northern seasonal rivers.Yufuhe river in Jinan has been taken as a case study in this paper. The main stream of Yufuhe river is 85.40 kilometers long and the river basin covers an area of 827.3 km2. The annual equal period of river interruption has amounted to 240 days, which has damaged the river ecosystem, reduced biodiversity gravely because of water development and natural precipitation condition. With Jinan's citilization strategy, Yufuhe river ecological situation can not adapt to the city development need; and urban resident environment consciousness improvement requires that Yufuhe river provides more resorts by river restoration .In the paper, restoration targets and steps have been ascertained on basis of investigation of river basin, and water demands and patterns ensuring fundamental water resource requirement of ecology for middle and lower reaches are provided, and river restoration patterns and key engineering techniques for seasonal rivers in north China have been probed. Main jobs accomplished as follow:(1) By data analysis, field survey and remote sense, the current situation of Yufuhe river basin have been investigated, and main ecological environment problems have been analyzed. On the basis, targets and steps of river restoration have been ascertained.(2) By inflection point method river, basic ecological flows of Yufuhe river mainstream is calculated, and river restoration scheme's are simulated by making use of the Mike11 software. New calculation method of water resource requirement of eco-environment and new pattern of water supplement for northern seasonal rivers are investigated.(3)Models for reservoir operation optimization have been built making use of Wohushan reservoir to satisfy ecological water requrement of lower reaches. By alternatives comparison, the reservoir operation mode ensuring Yufuhe river to be a perennial river have been proposed which has provided water yield guarantee for Yufuhe river restoration.(4) According to new river restoration ideas and the concrete targets, the technical scheme have been brought forward for Yufuhe river restoration, and engineering practice of typical reach have been carried out. Successful experience for river restoration has been summerized.(5) Yufuhe river restoration management measures have been brought forward which provide the technical basis for river plans and restoration in the future.