Research On The Impact Of Climate Change On The Annual Runoff Of Typical Watershed In North China

Climate change is an important global environmental issue. Global warming, which has frequently attracted the attention of the society, will possibly change the current regimes of precipitation, hydrological cycle and water resources. It’s significant to study impacts of climate change on hydrology and water resources, which could provide scientific supports for sustainable utilization of water resources and healthy life maintenance of river. The study of the influence of climate factors on runoff can help to realize the forecast of runoff changing trend and reasonable development, configuration and use of runoff, ensure the sustainable use of water resources, which is of great theoretical significance and practical significance for planning and design, development, utilization and operation management of the water resources system.The Second Songhuajiang River basin is located in the north of northeast China, its hydrological factors has changed significantly in the big background of global climate change. In order to understand the future change tendency, this paper analyzed the intra-annual and annual period variation characteristics of runoff by Man-Kendall test method and Curve deduction mass, etc. Through analysis of the fractal dimension of monthly average runoff, it is obvious that monthly average runoff has fractal features, which was maximum in wet season (July, August) while was minimum in May and June. Runoff and climatic factors are decomposed into multiple-scale series by EMD, meanwhile, IMF components has analyzed by SPA to get different time scales characteristics. Finally by means of grey relational analysis, the dominant climatic factor in runoff variation has obtained.