Streamflow depletion from groundwater pumping in contrasting hydrogeological landscapes: Evaluation and sensitivity of a new management tool

JOURNAL OF HYDROLOGY

卷:590

Article

Li, Qiang¹  Zipper, Samuel C.²  Gleeson, Tom¹ 

[1] Univ Victoria, Dept Civil Engn, 3800 Finnerty Rd, Victoria, BC V8P 4C2, Canada

[2] Univ Kansas, Kansas Geol Survey, Lawrence, KS 66047 USA

关键词: Streamflow depletion;    Groundwater pumping;    Analytical depletion functions;    Numerical model;    Conjunctive water management;   

DOI  :  10.1016/j.jhydrol.2020.125568

来源: Elsevier

【 摘 要 】

Groundwater pumping can reduce streamflow by reducing groundwater discharge and/or inducing streamflow infiltration, which together are referred to as streamflow depletion. Recently, analytical depletion functions (ADFs) have been suggested as rapid and accurate tools for streamflow depletion assessment, but their performance has only been tested in a few hydrogeological settings. To evaluate whether they will be useful tools for other regions with contrasting stream network and hydrogeological characteristics, we compared ADFs to calibrated MODFLOW models in BX Creek and Peace region with distinct hydrogeological settings (interior plateaus & highlands, and boreal plains, respectively) and spatial scales (165 km(2) and 1952 km(2), respectively) in British Columbia, Canada. Results showed that ADFs can accurately identify most affected streams by pumping for 100% and 83% of wells in the BX Creek and Peace region, respectively, and had small prediction errors compared with MODFLOW. Specifically, the mean absolute error of predicted depletion ranged from 2% to 14% of the highest simulated pumping rate over the study period of 30 years, with improved accuracy during the pumping season. We also found different responses of ADF performance to hydrostratigraphic properties such as hydraulic conductivity, aquifer thickness, streambed conductance, and well depth across two domains, indicating that different factors control ADF accuracy in different hydrogeological settings. Therefore, we conclude that ADFs are useful tools for conjunctive water management, but a good understanding of local hydrogeological conditions is needed to address the potential uncertainty of ADFs for decision-making.

【 授权许可】

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