Origine de l’eau souterraine pompée dans un système aquifère multicouche de la Upper Gulf Coastal Plain, USA Fuentes de bombeo de agua subterránea en un sistema acuífero estratificado en Upper Gulf Coastal Plain, EEUU 美国墨西哥湾区近海平原层状含水层系统中开采的地下水的来源 Fontes de bombeamento de águas subterrâneas num sistema aquífero multicamada na Planície Costeira do Alto Golfo, EUA | Sources of groundwater pumpage in a layered aquifer system in the Upper Gulf Coastal Plain, USA
2012
Huang, Yun | Scanlon, Bridget R. | Nicot, Jean-Philippe | Reedy, R. C. (Robert C.) | Dutton, Alan R. | Kelley, Van A. | Deeds, Neil E.
Understanding groundwater-pumpage sources is essential for assessing impacts on water resources and sustainability. The objective of this study was to quantify pumping impacts and sources in dipping, unconfined/confined aquifers in the Gulf Coast (USA) using the Texas Carrizo-Wilcox aquifer. Potentiometric-surface and streamflow data and groundwater modeling were used to evaluate sources and impacts of pumpage. Estimated groundwater storage is much greater in the confined aquifer (2,200 km3) than in the unconfined aquifer (170 km3); however, feasibility of abstraction depends on pumpage impacts on the flow system. Simulated pre-development recharge (0.96 km3/yr) discharged through evapotranspiration (ET, ∼37%), baseflow to streams (∼57%), and to the confined aquifer (∼6%). Transient simulations (1980–1999) show that pumpage changed three out of ten streams from gaining to losing in the semiarid south and reversed regional vertical flow gradients in ∼40% of the entire aquifer area. Simulations of predictive pumpage to 2050 indicate continued storage depletion (41% from storage, 32% from local discharge, and 25% from regional discharge capture). It takes ∼100 yrs to recover 40% of storage after pumpage ceases in the south. This study underscores the importance of considering capture mechanism and long-term system response in developing water-management strategies.
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