Influence of pumping operational schedule on solute concentrations at a well in randomly heterogeneous aquifers

被引:34
|
作者
Libera, Arianna [1 ]
de Barros, Felipe P. J. [1 ]
Guadagnini, Alberto [2 ,3 ]
机构
[1] Univ Southern Calif, Sonny Astani Dept Civil & Environm Engn, Kaprielian Hall,3620 S Vermont Ave, Los Angeles, CA 90089 USA
[2] Politecn Milan, Dipartimento Ingn Civile & Ambientale, Piazza L Da Vinci 32, I-20133 Milan, Italy
[3] Univ Arizona, Dept Hydrol & Atmospher Sci, Tucson, AZ 85721 USA
关键词
Stochastic hydrogeology; Well pumping operation; Heterogeneity; Engineering control; Risk analysis; Contaminant transport; CAPTURE ZONE DELINEATION; RADIAL FLOW; CONCENTRATION FLUCTUATIONS; CONDITIONAL PROBABILITIES; STOCHASTIC DETERMINATION; UNCERTAINTY ESTIMATION; GROUNDWATER-FLOW; RISK-ASSESSMENT; FLUX APPROACH; TRANSPORT;
D O I
10.1016/j.jhydrol.2016.12.022
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
We investigate the way diverse groundwater extraction strategies affect the history of solute concentration recovered at a pumping well while taking into account random spatial variability of the system hydraulic conductivity. Considering the joint effects of spatially heterogeneous hydraulic conductivity and temporally varying well pumping rates leads to a realistic evaluation of groundwater contamination risk at the pumping well location. We juxtapose the results obtained when the pumping well extracts a given amount of water operating (a) at a uniform pumping rate and (b) under a transient regime. The analysis is performed within a numerical Monte Carlo framework. Our results show that contaminant concentration breakthrough curves (BTCs) at the well are markedly affected by the transient pumping strategy according to which the well is operated. Our results document the occurrence in time of multiple peaks in the mean and variance of flux-averaged concentrations at the extraction well operating at a transient rate. Our findings suggest that lowest and largest values of mean and variance of flux-averaged concentration at the well tend to occur at the same time. We show that uncertainty associated with detected BTCs at the well increases for pumping regimes displaying a high degree of temporal variability. As such, the choice of the type of engineering control to the temporal sequence of pumping rates could represent a key factor to drive quantification of uncertainty of the contaminant concentration detected at the well. It is documented that pumping rate fluctuations induce a temporally oscillating risk pattern at the well, thus suggesting that the selection of a dynamic pumping regime has a clear influence on the temporal evolution of risk at the well. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:490 / 502
页数:13
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