Groundwater-surface water exchanges in an alluvial plain in southern France subjected to pumping: A coupled multitracer and modeling approach

IF 4.7 2区 地球科学 Q1 WATER RESOURCES
Jérôme Texier , Julio Gonçalvès , Thomas Stieglitz , Christine Vallet-Coulomb , Jérôme Labille , Vincent Marc , Angélique Poulain , Philippe Dussouillez
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引用次数: 0

Abstract

Study region

The study was conducted in an alluvial plain between the Rhône and the Ouvèze Rivers (in the southeast of France) extensively exploited for drinking water. The research area is characterized by significant groundwater-surface interactions influenced by groundwater pumping activities.

Study focus

The aim of this study is to enhance the understanding of interactions between rivers and alluvial aquifers by combined multi-tracer and numerical modeling approaches. Over an 18-month period, groundwater temperature, piezometric levels, and river surface water levels were continuously monitored. Field campaigns focused on conductivity, stable isotopes of water, and radon-222 activity concentration in both groundwater and surface water. Radon-222 was used to quantify water exchanges between the river and the aquifer. A MODFLOW model, calibrated using piezometric data and PEST, was employed to simulate groundwater flow and reactive transport of radon-222 using MT3DMS.

New hydrological insights for the region

The study reveals that river water recharges the aquifer, with radon-222 data delineating this recharge zone. The methodology extended the interpretation of periodic groundwater temperature signals to isotopic signals, allowing the identification of dispersivity and Darcy's velocity. The Ouvèze River was found to contribute approximately 55 % of the pumping water supply, alongside the Rhône. These findings provide valuable insights for sustainable water resource management, demonstrating the relevance of using natural tracers in scenarios where artificial tracers are impractical.
受抽水影响的法国南部冲积平原的地下水-地表水交换:多示踪剂和建模耦合方法
研究区域该研究在罗讷河和乌韦兹河(位于法国东南部)之间的冲积平原进行,该平原被广泛开发用于饮用水。研究重点这项研究旨在通过多示踪剂和数值建模相结合的方法,加深对河流和冲积含水层之间相互作用的了解。在为期 18 个月的时间里,对地下水温度、压水位和河流地表水位进行了连续监测。实地活动的重点是地下水和地表水中的电导率、水的稳定同位素以及氡-222 活性浓度。氡-222 被用来量化河流与含水层之间的水交换。该研究揭示了河水对含水层的补给作用,氡-222 数据则划定了这一补给区。该方法将周期性地下水温度信号的解释扩展到同位素信号,从而确定了分散性和达西速度。研究发现,乌韦兹河与罗纳河的水量约占抽水水量的 55%。这些发现为水资源的可持续管理提供了宝贵的见解,证明了在人工示踪剂不可行的情况下使用自然示踪剂的相关性。
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来源期刊
Journal of Hydrology-Regional Studies
Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)
CiteScore
6.70
自引率
8.50%
发文量
284
审稿时长
60 days
期刊介绍: Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.
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