One-dimensional transient flow in a finite fractured aquifer system
作者:
HALİL ÖNDER,
期刊:
Hydrological Sciences Journal
(Taylor Available online 1998)
卷期:
Volume 43,
issue 2
页码: 243-265
ISSN:0262-6667
年代: 1998
DOI:10.1080/02626669809492120
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A confined finite fractured aquifer bounded by a stream on one side and by an impervious boundary on the other is considered. Unsteady flow in the aquifer resulting from a sudden rise (or drop) of water level in the river stage is analysed. The governing differential equations are based on the double porosity conceptual model with the assumption of pseudo-steady state fracture-to-block flow. By applying finite Fourier sine and Laplace transform techniques to the governing equations, analytical solutions for the piezometric head distribution are obtained. By applying Darcy's law the time-dependent flow rate to (or from) the aquifer per unit length of the stream is evaluated. For negligible storage coefficient or hydraulic conductivity of the blocks, the new solutions reduce to known forms. The proposed analytical solutions may be useful in predicting the variations in the water levels in the aquifer as well as evaluating the time-dependent flow rates especially in the analysis of recession hydrographs in the streams. The solutions may also be used for the identification of the aquifer properties and for numerical model validation.
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