【摘要】 本文针对浅部三层结构含水层地区,研究了大面积均匀布井情况下自承压含水层或潜水含水层或自二个含水层同时抽取定流量时水井附近地下水非稳定流的计算方法。推导山三层结构含水层各层水位降深计算式,并求得了抽水初期和抽水后期的近似解。计算公式形式简单,计算方便。同时,根据同一数学模型,采用迦略金法对三组偏微分方程离散,进行数值模拟计算。应用对各层相互交替计算的迭代求解,方法比较简便。数值计算结果与解析解十分吻合。文中提出在三层结构含水层,大面积上均匀布井情况下井灌井排的水井间距的计算公式,为拟定井距提供参考依据。更多还原

【Abstract】 This paper is concerned with the calculation of drawdown distribution caused by the pumping of wells at a constant rate in a multiaquifer system containing unconfined and confined aquifers interconnected by an aquitard. Solutions for the drawdown distribution in each layer of the system are derived. Simple approximate solutions are obtained for long times and short times of pumping. A quasi-threedimentional Galerkin finito element model is developed for the analysis of the hetcrogeneous multiaquifer system. The solutions are simple and convenient. The drawdowns of aquifers and aquitard are solved separately and their coupling is provided through the leakage flux. The numerical model is shown to be very effective and the numerical results are in good agreement with analytical solutions. Formulas for determining the spacing of wells for irrigation and drainage evenly distributed in an extensive multiaquifer system are also presented.更多还原