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绿洲土地利用会影响地下水位和地下水矿化度在时间和空间上变化,而这种变化反过来又会影响到土地利用。为了更好地了解二者的互动作用,论文以民勤绿洲为例建立了模拟绿洲土地利用影响下地下水矿化度时空变化的模型。文中选用二维地下潜水流模型描述绿洲平原区潜水-微承压水系统的地下水流,选用对流-弥散方程描述地下水溶质运移,用计算地下水流的FEFLOW软件求解,把土地利用的影响作为模型源汇项处理,以GIS处理区域土地利用的空间数据。在缺乏连续的矿化度观测值的情况下,通过把模拟的区域矿化度变幅分布图与已有文献报道1979~1990的地下水矿化度变幅分布图对比分析来调整参数,直到使二者基本符合即认为参数满足要求。经过初步验证,此种方法建立的模型能很好地模拟绿洲土地利用对地下水矿化度时空变化的影响。
Oasis land use affects the spatial and temporal changes in groundwater table and groundwater salinity, which in turn can affect land use. In order to better understand the interaction between the two, the paper takes Minqin oasis as an example to establish a model to simulate the temporal and spatial variation of groundwater salinity under oasis land use. In this paper, two-dimensional subsurface flow model is used to describe the groundwater flow of the submarine-micro-pressure water system in the oasis plain. The convection-dispersion equation is used to describe the solute transport of groundwater. The groundwater flow is calculated by FEFLOW software. The effect of land use is taken as a model Source and sink processing to GIS processing of regional land use spatial data. In the absence of continuous salinity observations, the parameters were adjusted by comparing the simulated regional salinity distribution maps with the groundwater salinity profiles reported in the literature from 1979 to 1990, The two are basically in line with the parameters that meet the requirements. After preliminary verification, the model established by this method can well simulate the impact of oasis land use on the temporal and spatial variation of groundwater salinity.