Calcul de la recharge naturelle par la méthode de fluctuation de la nappe aquifère: où implanter un puits d’observation

IF 2.4 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Jean-Christophe Maréchal, Pierre Perrochet, Yvan Caballero
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引用次数: 0

Abstract

Accurate evaluation of natural recharge is fundamental for the estimation of renewable groundwater resources and constitutes a key issue for water resources management. Among physical, chemical and numerical methods, the water-table fluctuation technique is simple and easy to use. The main question is where, with respect to the draining stream, to locate the monitoring well to effectively observe representative water level fluctuations. Storage and discharged volumes in an unconfined aquifer during the water-table fluctuation application are described with equations using the Dupuit-Forchheimer model. This leads to the determination of an optimal distance from the stream (0.4 times the length of the aquifer) for siting observation wells. Beyond this distance, the computed volumes stored in the aquifer are overestimated by up to 20%. Less than this distance, the stored volume is highly underestimated.

Abstract Image

用含水层波动法计算自然补给:观测井的位置
准确评价自然补给是地下水可再生资源估算的基础,也是水资源管理的关键问题。在物理、化学和数值方法中,地下水位波动法是一种简单易行的方法。主要的问题是,相对于排水流,在哪里定位监测井,以有效地观察有代表性的水位波动。利用Dupuit-Forchheimer模型用方程描述了地下水位波动作用下无承压含水层的储水量和排水量。这就决定了观测井与河流的最佳距离(含水层长度的0.4倍)。超过这个距离,含水层中存储的计算体积被高估了20%。小于这个距离,存储的体积就被大大低估了。
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来源期刊
Hydrogeology Journal
Hydrogeology Journal 地学-地球科学综合
CiteScore
5.40
自引率
7.10%
发文量
128
审稿时长
6 months
期刊介绍: Hydrogeology Journal was founded in 1992 to foster understanding of hydrogeology; to describe worldwide progress in hydrogeology; and to provide an accessible forum for scientists, researchers, engineers, and practitioners in developing and industrialized countries. Since then, the journal has earned a large worldwide readership. Its peer-reviewed research articles integrate subsurface hydrology and geology with supporting disciplines: geochemistry, geophysics, geomorphology, geobiology, surface-water hydrology, tectonics, numerical modeling, economics, and sociology.
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