Artificial Regulation & Storage Scheme Of Groundwater Reservoir In Western Daqing

Due to the serious limited surfaces water resource in the Daqing petroleum mining area, groundwater has been the main water supply of the city and industry. Since Daqing is a city that primarily based on the petroleum mining and petroleum manufacture, the long term groundwater over pumping has resulted in the formation of the eastern and the western regional groundwater depression cones, and caused the consistent deterioration of the ecosystem environment and the occurrence of the environmental geological disaster. The thesis studies artificial regulation & storage schemes of Western Daqing groundwater reservoir. This study has great meanings in the controlling and improving of the geological setting, preventing the potential environmental geological disaster, enhancing the water supply safety to the study area and obtaining economic benefits at the process of artificial regulation & storage.On the basis of the analyzing of groundwater exploitation and utilization data of years in Daqing, we use the groundwater mathematical model and the linear programming method to study artificial regulation & storage scheme of Western Daqing groundwater reservoir. The predecessors had already carried on a lot of researches in the field of the artificial regulation & storage and the optimized management of groundwater, built up many models, and carried on an extensive study to the technique method. This research includes: using the groundwater mathematical model to simulate the area of groundwater reservoir, and to forecast groundwater level; coupling the mathematical model and optimized model; using the linear programming method to carry out the optimized management, in the meantime, On the basis of the optimized management of the line programming method, using the groundwater mathematical model to forecast groundwater level; synthesizing and analyzing schemes, and so on. Through these studies, we draw the following conclusions:1. The western part of Daqing is much suitable for the Artificial regulation & storage of groundwater: the reservoir area aquifer is composed of grit of Baitushan group ,Quaternary sediments and the Taikang group, Tertiary sediments, which is of high water storability and water conductivity, the boundary condition is suitable for water storage; the water resources of the ground- water artificial recharge is sufficient, the NenJiang river water is available for the underground reservoir recharge; and what's more, with the hydraulic structures foundation, such as the Longhupao channel. The choice of the ground- water artificial recharge place, should not only think about the geological and hydrological conditions but also give consideration to the economical conditions, and look after both sides of the present hydraulic structures foundation and the water plant.2. Using the built groundwater mathematical model, to forecast groundwater level of the studying area, and analyzing the variety trend of the underground water level and landing the development trend of the funnel. From the end of 2007 to the end of 2010, the groundwater level in the depression cone centre (the main plants) would have a little rise (about 2.5m), the water level would be 117~120m, only in the Xinger water plant have a little down; From 2005 to begin, the underground water level keeps an opposite stability.3. On the foundation of the calibrated and validated groundwater mathematical model, using the response matrix method to couple the mathematical model and optimized model, and establish groundwater management model. On the basis of the optimized management of the line programming method, using the groundwater mathematical model to forecast groundwater level.Optimized results manifest that on the basis of the exploitation rate just have a slightly cut down, the effect of ground- water artificial recharge is better.4. The study's results manifest: Optimizing recharge on the basis of the exploitation keeps at current condition, the water level has a rather obvious promotion. At the end of 2010, in the groundwater plant of Qianjin, Nan and Naner, the water level attains to 128～132meters.The funnel center moves to the groundwater plant of Xingshugang and Xinger nearby. And the ground water level of the new funnel center (the groundwater plant of Xingshugang and Xinger) attains to 123～126meters. Don't still attain to the groundwater reservoir constructional request; Optimizing recharge on the basis of the exploitation just have a slightly cut down, the water level has a obvious promotion.. At the end of 2010, in the groundwater plant of Qianjin, Nan and Naner, the water level attains to 131～134meters.The funnel center moves to the groundwater plant of Xingshugang and Xinger nearby. And the ground water level of the new funnel center (the groundwater plant of Xingshugang and Xinger) attains to 125～127meters. Results optimized can attain to the groundwater reservoir constructional request.5. Artificial regulation & storage scheme of Western Daqing groundwater reservoir: Artificial recharge on the basis of the exploitation of the major groundwater plant just have a slightly cut down (about5%) from 2007 to 2010. And the artificial recharge according to the following methods: ①the method of the artificial recharge: The artificial recharge uses the motor-pumped well.②the water source of the artificial recharge: LongHuPao reservoir③the artificial recharge rate: 12×104m3/d④the artificial recharge rate of the one well and the well number: The artificial recharge rate of the one well is 2000m3/d. And the well number is 60.⑤the arrangement way of the artificial recharge wells: The artificial recharge wells use the complete well; the average depth is 200m; the internal diameter of the wells is 600mm; the distance between the two wells is 700m; the distance between the two well rows is 1000m; the shape is like to the blossom. At the optimizing site number 21 (631970,5156820), crosscutting the groundwater flood, the well number is 34, four well rows, the artificial recharge rate of the one well is 2000m3/d; At the optimizing site number 13 (631970,5164825), crosscutting the groundwater flood, the well number is 26, three well rows, the artificial recharge rate of the one well is 2000m3/d.