VARIABLE DISCHARGE TYPE CURVE SOLUTIONS FOR CONFINED AQUIFERS 1
VARIABLE DISCHARGE TYPE CURVE SOLUTIONS FOR CONFINED AQUIFERS 1
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DOI：
10.1111/j.1752-1688.2004.tb01578.x
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发表时间：
2004-10
期刊：
影响因子：
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通讯作者：
Z. Şen;Abüsselam Altunkaynak
中科院分区：
文献类型：
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作者：
Z. Şen;Abüsselam Altunkaynak
摘要：现有的含水层试验分析方法几乎都是假定常流量边界条件。在许多实际的抽水试验中，不能保持恒定的流量。本文提出了变流量含水层试验的一般解法。本文给出了在均匀、水平、大范围、均质、各向同性承压含水层中，当流量随时间变化时，无限小直径水井周围水位降深分布的精确解。给出了任意流量变化引起的典型曲线的一般方程，并详细介绍了它在指数变化情况下的应用。通过考虑后期水位降深数据，提出了一种简单的直线法用于现场应用。恒定流量的考虑导致高估了渗透率，但低估了储存率。通过一个现场实例说明了流量变化的实际应用。
ABSTRACT: Almost all of the existing solutions of aquifer test analysis assume constant discharge rate boundary conditions. In many actual pumping tests, constant discharge cannot be maintained. This paper presents a general solution for an aquifer test with variable discharge. The exact solution of drawdown distribution around an infinitesimally small diameter well in a uniform, horizontal, extensive, homogeneous, and isotropic confined aquifer is presented when the discharge changes with time during the aquifer test period. A general equation for the type curves resulting from any discharge variability is given, and its application for the exponential changes is presented in detail. A simple straight line procedure is proposed for field applications by considering late time drawdown data. The consideration of constant discharge leads to overestimation of transmissivity but storativity is underestimated. Practical application of the discharge variability is illustrated by a field example.