California GAMA Special Study: Importance of River Water Recharge to Selected Groundwater Basins

doi:10.2172/1259757

GSTDTAP > 地球科学

DOI	10.2172/1259757
报告编号	LLNL--TR-686433
来源ID	OSTI ID: 1259757
	California GAMA Special Study: Importance of River Water Recharge to Selected Groundwater Basins
	Visser, Ate; Moran, Jean E.; Singleton, Michael J.; Esser, Bradley K.
	2016-03-21
出版年	2016
页数	30
语种	英语
国家	美国
领域	地球科学
英文摘要	River recharge represents 63%, 86% and 46% of modern groundwater in the Mojave Desert, Owens Valley, and San Joaquin Valley, respectively. In pre-modern groundwater, river recharge represents a lower fraction: 36%, 46%, and 24% respectively. The importance of river water recharge in the San Joaquin valley has nearly doubled and is likely the result of a total increase of recharge of 40%, caused by river water irrigation return flows. This emphasizes the importance of recharge of river water via irrigation for renewal of groundwater resources. Mountain front recharge and local precipitation contribute to recharge of desert groundwater basins in part as the result of geological features focusing scarce precipitation promoting infiltration. River water recharges groundwater systems under lower temperatures and with larger water table fluctuations than local precipitation recharge. Surface storage is limited in time and volume, as evidenced by cold river recharge temperatures resulting from fast recharge, compared to the large capacity for subsurface storage. Groundwater banking of seasonal surface water flows therefore appears to be a natural and promising method for increasing the resilience of water supply systems. The distinct isotopic and noble gas signatures of river water recharge, compared to local precipitation recharge, reflecting the source and mechanism of recharge, are valuable constraints for numerical flow models.
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来源平台	US Department of Energy (DOE)
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/7166
专题	地球科学
推荐引用方式 GB/T 7714	Visser, Ate,Moran, Jean E.,Singleton, Michael J.,et al. California GAMA Special Study: Importance of River Water Recharge to Selected Groundwater Basins,2016.