关中地区地下水储量时空变化监测与分析

发布时间：2018-05-03 22:44

本文选题：关中地区 + 地下水储量　；参考：《兰州交通大学》2017年硕士论文

【摘要】：近年来,“地下水过量开采”以及“水质污染”等地下水危机问题逐渐显现,所以对于地下水资源的监测和研究就显得尤为重要。本文以我国西北部关中城市群所在的关中平原地区为研究区域,联合多源GNSS数据,以重力场及其确定的大陆水等效水高变化为参考场,采用移去恢复法,确定关中城市群高分辨率的非构造形变;基于地球负荷弹性形变理论,本文从CORS站垂直形变中,移去潮汐影响(极潮、固体潮、半日以及周日大气潮负荷)及土壤水、大气负荷影响,采用地球负荷形变和地球重力场严密组合的方法,联合地下水测站数据来解算关中地区地下水储量的月变化,实现了关中城市群地下水储量时空变化监测与分析。本文的主要研究成果如下:(1)本文综合使用了多种数据,其中最为关键的区域CORS站整体数据良好,数据周期性明显,站点大地高数值范围在㧟40㧟40mm之间;通过各类数据计算而得的区域年平均大气导纳值范围在㧟1.9—㧟0.7之间、大气压变化对CORS站的垂直型变影响数值范围在㧟20—20mm、站点低频参数计算时序滤波值在㧟10—10mm之间。(2)联合解算出区域的地下水变化,发现(1)区域地下水储量变化值在-1.2m—0.9m之间;(2)从2011年至2016年上半年整体变化幅度不大;(3)地下水储量变化的区域性比较明显,在陕西西北部和宁夏东部地下水储量减少明显,相对2011年6月的值减少可达1.2m,而甘肃东部,与陕西和宁夏交界地区地下水储量增加比较明显,相对2011年6月增加可达0.9m。通过对水储量年平均变化计算发现,近年来城市群地下水储量变化总体平稳,部分地区仍有下降趋势,下降幅度在2cm/y左右。对关中平原地区地下水储量变化的情况进行监测,而且监测其长时间序列的形变,掌握地下水储量现状,以及以后深入探索地下水储量变化的成因,这样可以帮助相关政府部门在进行规划、制定防灾减灾方案以及决策提供一定的资料,具有一定的科研价值以及实用价值。
[Abstract]:In recent years, the problems of groundwater crisis such as "groundwater overexploitation" and "water pollution" have gradually appeared, so it is particularly important to monitor and study groundwater resources. In this paper, the Guanzhong Plain, where the Guanzhong Urban agglomeration in the northwest of China is located, is used as the study area, and the gravity field and the change of the equivalent water height of the continental water are taken as the reference field, and the method of removal and restoration is adopted. Based on the elastic deformation theory of earth load, the tidal influence (polar tide, solid tide, semi-diurnal and diurnal atmospheric tidal load) and soil water are removed from the vertical deformation of CORS station. Under the influence of atmospheric load, the monthly variation of groundwater reserves in Guanzhong area is calculated by combining the ground water station data with the rigorous combination of earth load deformation and earth gravity field. The monitoring and analysis of groundwater reserves in Guanzhong urban agglomeration are realized. The main research results of this paper are as follows: (1) in this paper, many kinds of data are synthetically used, among which the most critical area CORS station has good overall data, the periodicity of the data is obvious, the height of the station is in the range of 40mm or 40mm; The regional average atmospheric admittance calculated from various data ranges from 1.9-0.7. The influence of atmospheric pressure on the vertical variation of CORS station is in the range of 20-20mm, and the time-series filtering value of the low-frequency parameters of the station is between 10-10mm and 10-10mm. It is found that the variation of regional groundwater reserves is between -1.2m-0.9m) from 2011 to the first half of 2016, the variation range of groundwater reserves is not large. (3) the regional variation of groundwater reserves is obvious, and the groundwater reserves decrease obviously in northwest Shaanxi and eastern Ningxia. Compared with June 2011, the value of groundwater decreased by 1.2 m, but in the eastern part of Gansu, the groundwater reserves increased obviously in the border areas of Shaanxi and Ningxia, and the increase reached 0.9mcompared with June 2011. Through the calculation of the annual average water reserves, it is found that the groundwater reserves of urban agglomeration have a steady change in recent years, and some areas still have a downward trend, the decline range is about 2cm/y. Monitoring the change of groundwater reserves in Guanzhong Plain, monitoring the deformation of its long time series, mastering the present situation of groundwater reserves, and further exploring the causes of groundwater reserves change, This can help the relevant government departments in planning, disaster prevention and mitigation programs and decision-making to provide certain information, with a certain value of scientific research and practical value.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P641.7;P228.4

【参考文献】