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标题：Geophysical, remote sensing, GIS, and isotopic applications for a better understanding of the structural controls on groundwater flow in the Mojave Desert, California
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作者：D. Dailey ; W. Sauck ; M. Sultan 等
期刊名称：Journal of Hydrology: Regional Studies
印刷版ISSN：2214-5818
出版年度：2015
卷号：3
页码：211-232
DOI：10.1016/j.ejrh.2014.12.002
出版社：Elsevier B.V.
摘要：Abstract Study region Mojave Desert, USA. Study focus An integrated (near-surface geophysics, remote sensing, isotopic analyses) study was conducted in the Mojave River Basin and Morongo Groundwater Basin to investigate potential effects that the Helendale Fault [HF] and basement uplifts might have on groundwater flow in the Mojave Desert. New hydrological insights for the region The {HF} traces were mapped using LiDAR and Geoeye-1 imagery (surface) and magnetic profiles (subsurface). Shallow basement parallel to and west of the {HF} was detected using the Vertical Electrical Soundings (VESs). Conductive water-saturated breccia was detected along the {HF} using the Very Low Frequency (VLF) electromagnetic measurements. Isotopic analyses (δD and δ18O) for groundwater samples from productive shallow wells, and springs sampled west of the {HF} and the basement uplift are less depleted (Group I: Fifteenmile Valley Groundwater sub-basin [FVGS]; average δD: −86.8‰; δ18O: −11.8‰) than samples east of the basement uplift (Group II: Lucerne Valley Groundwater sub-basin [LVGS]; average δD: −95.0‰; δ18O: −12.1‰), whereas samples proximal to, the fault have compositions similar to Group I but show evidence for mixing with Group {II} compositions (Group III; average δD: −88.8‰; δ18O: −11.5‰). Findings are consistent with the {HF} channeling groundwater from the San Bernardino Mountains with basement uplifts acting as barriers to lateral groundwater flow and could be applicable to similar settings across the Mojave Desert and elsewhere worldwide.
关键词：Mojave desert; Groundwater flow; Structural controls; Geophysics (VLF; Magnetic; VES); Isotopic analyses (O; H); Remote sensing (LiDAR; GeoEye; 1)