TY - JOUR
T1 - A Mountain-Front Recharge Component Characterization Approach Combining Groundwater Age Distributions, Noble Gas Thermometry, and Fluid and Energy Transport Modeling
AU - Markovich, Katherine H.
AU - Condon, Laura E.
AU - Carroll, Kenneth C.
AU - Purtschert, Roland
AU - McIntosh, Jennifer C.
N1 - Funding Information:
This work was made possible due to the generous cooperation and support from Dick Thompson of Tucson Water, Trevor Hare of the Watershed Management Group, and the Pima County Department of Parks and Recreation. The first author was supported by an NSF EAR Postdoctoral Fellowship (Award ID 1806383). The U.S.-Mexico Transboundary Aquifer Assessment Act (Public Law 109-448) and Cooperative Agreement Project Between NMSU, NM WRRI, and the U.S. Bureau of Reclamation are gratefully acknowledged for their support and funding of this study. The NSF Santa Catalina mountains and Jemez River Basin Critical Zone Observatory (EAR-1331408) also provided support for this study. The authors declare no real or perceived financial conflicts of interest nor any conflict of interest with respect to the results of this paper.
Publisher Copyright:
© 2020. American Geophysical Union. All Rights Reserved.
PY - 2021/1
Y1 - 2021/1
N2 - Mountain-front recharge (MFR), or all inflow to a basin-fill aquifer with its source in the mountain block, is an important component of recharge to basin-fill aquifer systems. Distinguishing and quantifying the surface from subsurface components of MFR is necessary for water resource planning and management, particularly as climate change may impact these components in distinct ways. This study tests the hypothesis that MFR components can be distinguished in long-screened, basin-fill production wells by (1) groundwater age and (2) the median elevation of recharge. We developed an MFR characterization approach by combining age distributions in six wells using tritium, krypton-85, argon-39, and radiocarbon, and median recharge elevations from noble gas thermometry combined with numerical experiments to determine recharge temperature lapse rates using flow and energy transport modeling. We found that groundwater age distributions provided valuable information for characterizing the dominant flow system behavior captured by the basin-fill production wells. Tracers indicated the presence of old (i.e., no detectable tritium) water in a well completed in weathered bedrock located close to the mountain front. Two production wells exhibited age distributions of binary mixing between modern and a small fraction of old water, whereas the remaining wells captured predominantly modern flow paths. Noble gas thermometry provided important complementary information to the age distributions; however, assuming constant recharge temperature lapse rates produced improbable recharge elevations. Numerical experiments suggest that surface MFR, if derived from snowmelt, can locally suppress water table temperatures in the basin-fill aquifer, with implications for recharge elevations estimated from noble gas thermometry.
AB - Mountain-front recharge (MFR), or all inflow to a basin-fill aquifer with its source in the mountain block, is an important component of recharge to basin-fill aquifer systems. Distinguishing and quantifying the surface from subsurface components of MFR is necessary for water resource planning and management, particularly as climate change may impact these components in distinct ways. This study tests the hypothesis that MFR components can be distinguished in long-screened, basin-fill production wells by (1) groundwater age and (2) the median elevation of recharge. We developed an MFR characterization approach by combining age distributions in six wells using tritium, krypton-85, argon-39, and radiocarbon, and median recharge elevations from noble gas thermometry combined with numerical experiments to determine recharge temperature lapse rates using flow and energy transport modeling. We found that groundwater age distributions provided valuable information for characterizing the dominant flow system behavior captured by the basin-fill production wells. Tracers indicated the presence of old (i.e., no detectable tritium) water in a well completed in weathered bedrock located close to the mountain front. Two production wells exhibited age distributions of binary mixing between modern and a small fraction of old water, whereas the remaining wells captured predominantly modern flow paths. Noble gas thermometry provided important complementary information to the age distributions; however, assuming constant recharge temperature lapse rates produced improbable recharge elevations. Numerical experiments suggest that surface MFR, if derived from snowmelt, can locally suppress water table temperatures in the basin-fill aquifer, with implications for recharge elevations estimated from noble gas thermometry.
KW - argon-39
KW - fluid and energy transport modeling
KW - groundwater age distributions
KW - groundwater recharge
KW - mountain-front recharge
KW - noble gas thermometry
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U2 - 10.1029/2020WR027743
DO - 10.1029/2020WR027743
M3 - Article
AN - SCOPUS:85099957527
SN - 0043-1397
VL - 57
JO - Water Resources Research
JF - Water Resources Research
IS - 1
M1 - e2020WR027743
ER -