拉薩市河谷平原區(qū)地下水資源評價(jià)與合理開發(fā)利用
[Abstract]:The valley plain of Lhasa is one of the most densely populated areas with the fastest economic development in Tibet Autonomous region. It belongs to the valley landform of the plateau. The degree of hydrogeological work is low, the exploitation of groundwater is large, and there is a lack of systematic evaluation of groundwater resources. In this paper, the groundwater resources in the plain area of the valley of Lhasa City are evaluated and analyzed in order to provide scientific basis for the rational development and utilization of the groundwater resources in this area. Based on the systematic analysis of the geological and hydrogeological conditions in the study area, the conceptual model of hydrogeology in the plain area of Lhasa valley is established, and the numerical model of groundwater flow is established based on GMS software, and the model is identified and verified. The result is good. The groundwater equilibrium was calculated and compared with the numerical method. The recoverable groundwater was obtained as 345222.21m3 / d 303687.40m3 / d, and the groundwater exploitation potential index was 0.96 and 0.97, respectively. The equilibrium state of complement is adopted at the same place, and the comparison shows that the calculation result is reasonable. The results of comprehensive evaluation of groundwater quality show that the groundwater quality in the study area is good on the whole and poor in some areas. The dynamic change of groundwater in the plain area of Lhasa river valley mainly shows that the groundwater level decreases as a whole and shows certain stages, but the overall trend of groundwater flow field does not change. By using the numerical model of groundwater flow, the groundwater equilibrium was calculated and analyzed in 1970, 2000 and 2015. The results showed that the groundwater equilibrium gradually changed from positive equilibrium to negative equilibrium, and the Lhasa River played an important role in the water balance. The main reasons for the influence of human activities on groundwater are the increase of groundwater exploitation year by year, the increasing of urban construction land and the decrease of wetland area. By using the groundwater flow model established, the variation of water level of different mining schemes is predicted. The results show that the present mining layout condition has little influence on the groundwater level, but the increase of mining yield should not exceed 1/2 of the present situation; Under the condition of increasing mining capacity, the optimum mining plan is to share the new water source along Lhasa River. After comprehensive analysis, the measures are put forward for the rational development and utilization of groundwater resources in the plain area of Lhasa valley.
【學(xué)位授予單位】:山東科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:P641.8
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