Application Of The HydroGeoSphere To Determine The Minimum Discharge Of The Baishi Reservoir

The Daling River is a cardinal recharge of the Daling-Xiaoling alluvial fan which is composed of sand and gravel. There are 16 perennial well-fields located on the fan aiming to provide water for industry, domestic use and irrigation of the Linghai City. And these well-fields pump water from the Quaternary and the Neozoic aquifers at a huge rate. During the years between 1996 and 2000, the Baishi Reservoir had been built to solve the water crisis in the Fuxin, Jinzhou and Beipiao. However, the reservoir diminished the stream flow of the Daling River which led to the decrease of the recharge to the fan. Thus the land-subsidence and the seawater-encroachment were aggravated in this area. This study was purposed to figure out a reasonable discharge of the Baishi Reservoir to meet the water demand in the area.Firstly, this paper introduced the previous work, problems and vista of the coupled surface and subsurface flow model. Then analyzed hydrogeological traits of the field and built a conceptual model. At last, HydroGeoSphere and ArcGIS were employed to calculate the minimum discharge of the Baishi Reservior in terms of the dichotomy.The major results of the study were:①the stream flow and the head of ground-water from 1996.5 to 1996.9 were used for the calibration of the model. And the stream flow and the head of ground-water from 1997.5 to 1997.9 were used to validate the model. The results of the calibration and the verification indicated the model can simulate the physical process of the water circulation in the area and can be use to calculate the minimum discharge of the Baishi Reservior. ②because of the roughness of the discretization and the error of the original data, the model couldn't particularly describe the dynamic of the Daling River and the ground-water. So the model could merely be use to study the macroscopical changes.③the minimum discharge of the Baishi Reservoir was about 5.35×108m3·a-1, which was about 29.88% of the annual stream flow of the Daling River. Because of the lack of the data of seawater-encroachment, the effect of it was neglected. So the minimum discharge maybe smaller than the real value.④the minimum discharge didn't equal to the sum of the artifical discerption. And the systematic theory should be employed to study the issue.⑤when the surface water and subsurface water closely related to each other, they should be taken as an integrity, and it would apply a more reliable support for the decision-making and evaluation of water resources.