PROGRESS IN GEOGRAPHY ›› 2012, Vol. 31 ›› Issue (5): 625-631.doi: 10.11820/dlkxjz.2012.05.011

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The Study of Ecological Water Demand at Yingluoxia Station of Heihe River

ZOU Yue, ZHANG Bo   

  1. College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China
  • Received:2011-10-01 Revised:2012-02-01 Online:2012-05-25 Published:2012-05-25

Abstract: It is a hot issue of ecological water demand in the study of water problem in recent years, especiallyin arid areas where the ecological environment deteriorated rapidly. Climate changes and human activities canlead to hydrological change, which means the local hydrological condition has changed and broke the ecologicalbalance. The authors adopted monthly runoff series data of 60 years at hydrological monitoring station of Yingluoxia in the Heihe River basin during the period 1947-2006. The difference plot curve-combined method ofrank test was used to identify the change point of hydrological processes and causes of these changes. On this basis,L-moment is used to evaluate the parameters of generalized extreme value (GEV) distribution of the monthlyflow series before hydrological change, and to calculate the maximum probability density runoff, which is theecological water demand of that month. The result shows that the ecological calculating method which takes the hydrological change into consideration is practicable in the Heihe River. Before and after the hydrological variability,the frequency to meet the ecological water demand will change significantly at Yingluoxia station. The climatic reasons inevitably exert influence on the volume of the runoff. So it is important to get a better understanding of ecological water demand in river ecosystem management and socio-economic sustainable development in arid areas.

Key words: difference plot curve-combined method of rank test, ecological water demand, Heihe River, hydrological change