大区域地下水模拟的理论和方法

Methodology for modeling of groundwater flow in large area

大区域地下水数值模拟中,存在时空尺度选择和信息不足问题。本文在融合地质统计、逆问题理论和地下水运动理论的基础上,提出了建立大区域地下水运动模拟的理论和方法。提出了大区域地下水有限元计算的时空尺度理论公式。针对信息不足,提出了大区域地下水位推定的方法。根据推定的地下水位,运用逆解析理论对大区域地下水含水层导水系数进行逆推定。本文将所提出的方法运用到日本北海道Sarobetsu湿地地下水模拟中,结果表明所提方法用于计算大区域湿地不恒定地下水得到较满意的结果。

By combining the geostatistics with theory of solving inverse problem and theory of groundwater movement, a methodology for simulating unsteady groundwater flow in large-scale area without sufficient data is proposed. The theoretical formula for temporal and space dimension of FEM calculation of groundwater flow is established and the method for identification of groundwater table under the condition of insufficient information is suggested. According to the identified groundwater table the inverse analytic method is applied to inversely deduce the hydraulic inductivity of the aquifer. The proposed method is applied to simulate the groundwater flow in Sarobetsu wetland, Sapporo Japan. Satisfactory result is attained.