Research On Theory And Method Of Ecological Environment Water Demand

The paper focused on the concepts, classification and calculating methods of ecological environment water demand at the basis of former research in this branch. As a case study, the present ecological environment water demand in Liaoyang City which is located in the Basin of Taizi river was calculated so as to offer technical support for Water Resources Integrated Planning in Liaoning Province. The main conclusions of this study are as follows:(DThe definition of ecological water use, ecological water demand and ecological water consumption should be parallel to the productive water use and domestic water use.(2)The differences between ecological water demand and ecological water consumption, ecological environment water demand and ecological environment water consumption, environment water demand and environment water consumption, were analyzed and the mutuality between them was studied too.(3)One set of ecological water demand classification system was put forward.(4)A new concept that making the reduced water amount corresponding to the mean annual precipitation during high-water seasons as the water quota of watershed slope measures in calculating the watershed slope measures of soil and water conservation was proposed.(5) The soil evaporating amount ( E_o) calculating method was corrected because of therepeatedly calculation of evaporation for vegetation relying on precipitation .(6)The total off-stream ecological environment water demand for Liaoyang City was 39.6808 million m~3. The water use for terraced field, afforestation, seeding grass and city greenization was 12.1140 million m~3, 11.4640 million m~3, 0.009 million m~3 and 16.0938 million m~3 respectively.