| Water and soil resources are changed under long-scale social-economic development, as a result, wetlands are dramatically reducing even dying out. To solve this problem, this paper mainly focuses ecological water demand in wetlands, and it is part of achievements of two projects which are ecological water use in Chinese different regions-the important project in the tenth five plan — and research on ecological water demand in the Songari River and Liao River basin.First of all, according to analysis the effect of ecosystem during the water cycle, the type of ecological water demand in wetland was clarified which is an azonal ecological system supported by the runoff with the feature of azonal. Therefore the relationship between the runoff and biodiversity field should be researched.Secondly, in an opinion of water resources planning and management, the eigenvalue of ecological water demand is found, which reflects the whole aquatic ecosystem's characteristics According to the relationship between water movement rule and ecological succession, meanwhile based on the traits of biology and water movement, the ecological and hydrological structure in wetlands is presented, namely the central area and active area in wetlands. Therefore a model of ecological water demand in wetland is built.Finally, the model is applied in the Zha Long natural conservation area. With the aid of the technology of GIS(Geography information system), RS(Remote sense) and the information of DEM, satellite images, the results of minimal and proper ecological water demand are obtained. Compared with the actual supplement water for Zha Long wetland, the caculated results is very close to the realistic situation. This proves the methodology and model is feasible and effective. |
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