【摘要】 以北京市平原区地下水系统作为研究对象,系统地收集整理了相关的地质和水文地质资料,通过对资料的综合分析,对边界条件、含水层结构等进行合理概化,建立了水文地质概念模型。在此基础上,运用MODFLOW软件建立了北京市平原区地下水流动的三维数值模型。模型垂向上剖分为10层,平面上每层剖分为499行×499列不规则矩形网格,有效单元共计1 103 000个,以刻画复杂的含水层结构和地下水三维流动特征。依据实测地下水位数据进行模型参数识别与校正,绝大多数计算水位与实测水位拟合较好,模拟流场与实测流场吻合,参数符合水文地质条件,表明本研究建立的数值模型能够较好地刻画北京平原区地下水流动特征。更多还原

【Abstract】 Taking Beijing plain groundwater system as the research object,this paper collected the concerned geological and hydrogeological data.By analyzing the data,a reasonable generalization was made on the boundary conditions and aquifer structure,and a conceptual model of hydrogeology was established.On this basis,MODFLOW was used to establish a groundwater flow numerical model for Beijing plain area.In order to describe the complex aquifer structure and three-dimensional groundwater flow characteristics,the vertical section of the model was divided into 10 layers,and every layer surface was divided into 499 ×499 irregular rectangular grid,with effective 1 103 000 units in total.According to the model parameter identification and correction based on the observed data,the most calculated and observed groundwater levels have better fitting,the simulated flow field and measured flow field coincide the parameters conform with the hydrological and geological conditions,which shows this study to establish the numerical model can characterize the Beijing plain groundwater flow characteristics.更多还原