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Open AccessArticle

Use of Radiocarbon Ages to Narrow Groundwater Recharge Estimates in the Southeastern Mojave Desert, USA

by 1,* and 2
1
Roux Associates, Inc., 555 12th Street, Suite 250, Oakland, CA 95607, USA
2
Partner Engineering and Science, Inc., 1761 E. Garry Avenue, Santa Ana, CA 92705, USA
*
Author to whom correspondence should be addressed.
Hydrology 2018, 5(3), 51; https://doi.org/10.3390/hydrology5030051
Received: 2 August 2018 / Revised: 4 September 2018 / Accepted: 10 September 2018 / Published: 13 September 2018
Estimating groundwater recharge in arid or semiarid regions can be a difficult and complex task, since it is dependent on a highly variable set of spatial and temporal hydrologic parameters and processes that are dependent on the local climate, the land surface properties, and subsurface characteristics. As a result, traditional methods for estimating the recharge can result in a wide range of derived values. This is evident in the southeastern Mojave Desert, where calculated recharge estimates by previous investigators that range over an order of magnitude (from ~2500 to ~37,000 acre feet per year) are reported. To narrow down this large span of recharge estimates to narrower and more plausible values, this study evaluates the previous recharge estimates in this region, to examine the sources of variability in the reported results and to constrain the recharge estimates based on the hydrologic conditions and the radiocarbon age-dating of spring flows—even without knowledge of the precise subsurface hydrology. The groundwater age and perennial flow characteristics of springs in this study could not be derived from waters sourced solely from local recharge. Therefore, the springs in this study require a significant groundwater contribution to their overall discharge. A previously described conceptual site model in the region established that Bonanza Spring is similarly hydrologically connected to the regional basin-fill aquifer, based on geologic and geochemical/isotopic analyses, and this conceptual site model for where perennial spring water is sourced should readily be extended to these other perennial springs in this region. View Full-Text
Keywords: water resources; Mojave Trails National Monument; Mojave Desert; Bonanza Spring; forensics; isotopes water resources; Mojave Trails National Monument; Mojave Desert; Bonanza Spring; forensics; isotopes
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MDPI and ACS Style

Love, A.H.; Zdon, A. Use of Radiocarbon Ages to Narrow Groundwater Recharge Estimates in the Southeastern Mojave Desert, USA. Hydrology 2018, 5, 51. https://doi.org/10.3390/hydrology5030051

AMA Style

Love AH, Zdon A. Use of Radiocarbon Ages to Narrow Groundwater Recharge Estimates in the Southeastern Mojave Desert, USA. Hydrology. 2018; 5(3):51. https://doi.org/10.3390/hydrology5030051

Chicago/Turabian Style

Love, Adam H.; Zdon, Andy. 2018. "Use of Radiocarbon Ages to Narrow Groundwater Recharge Estimates in the Southeastern Mojave Desert, USA" Hydrology 5, no. 3: 51. https://doi.org/10.3390/hydrology5030051

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