Research On Ecological Groundwater Table And Optimal Allocation Of Water Resources In Lower Liaohe River Plain

The ecological environment is the basic natural conditions related to the existence and development of mankind, and water resource is a foundation in the construction of ecological environment. The lower Liaohe River plain is located at the center of the former Liaoning industry foundation. Groundwater supply contributes 65 % of the total water supply, however, the environmental and hydrogeological problems caused by groundwater development are very serious, not only affecting the eco-environment improvement, but also a serious"bottleneck"to a regional economy development. Hence the significance in carrying out the research on ecological groundwater table and its regulation, which also include the ecological water requirement, is very important.Based on the field investigated data of the groundwater of lower Liaohe River plain and surface ecological relationship, and with the throughout understanding of the characteristic of hydrological cycle and ecology system, the paper analyzes the relationship between groundwater depth and rock property of aeration zone, and figures out ecological groundwater table. Firstly, based on the precipitation infiltration and evaporation fundamentals and combined with field experiment results, two series of ecological groundwater table standards were constructed by adopting the method of scenarios analysis. The two schemes in the second scenario: one considered the regulation function of aquifer and the other did not, were evaluated; secondly, the quantity of ecological modulation was calculated from the groundwater depth and by comparing the topographic and ecological groundwater depths; thirdly, the paper divides lower Liaohe River plain into four parts according to administrative district, and the quantity of ecological groundwater for each part is calculated respectively; finally, the modulating countermeasures for groundwater sustainable development were discussed.Aimed at the sustainable utilization of water resources, the paper propose the ecological-based regional ecological groundwater table theory and its regulation, which extends the theory of ecological water demand, based on the hydrogeological condition with the help of GIS technology. The paper takes the ecological groundwater demand into consideration when modulating the water resource, which may widen and enrich the research field of traditional water resources planning theory. The results of this research, in some degree, may contribute to the utilization and protection of groundwater resource in lower Liaohe River plain, and may provides some ideas for the counterparts research.