Estimation of Groundwater Recharge at Pahute Mesa using the Chloride Mass-Balance Method

doi:10.2172/1113247

GSTDTAP > 地球科学

DOI	10.2172/1113247
报告编号	45251
来源ID	OSTI ID: 1113247
	Estimation of Groundwater Recharge at Pahute Mesa using the Chloride Mass-Balance Method
	Cooper, Clay A [DRI]; Hershey, Ronald L [DRI]; Healey, John M [DRI]; Lyles, Brad F [DRI]
	2013-07-01
出版年	2013
语种	英语
国家	美国
领域	地球科学
英文摘要	Groundwater recharge on Pahute Mesa was estimated using the chloride mass-balance (CMB) method. This method relies on the conservative properties of chloride to trace its movement from the atmosphere as dry- and wet-deposition through the soil zone and ultimately to the saturated zone. Typically, the CMB method assumes no mixing of groundwater with different chloride concentrations; however, because groundwater is thought to flow into Pahute Mesa from valleys north of Pahute Mesa, groundwater flow rates (i.e., underflow) and chloride concentrations from Kawich Valley and Gold Flat were carefully considered. Precipitation was measured with bulk and tipping-bucket precipitation gauges installed for this study at six sites on Pahute Mesa. These data, along with historical precipitation amounts from gauges on Pahute Mesa and estimates from the PRISM model, were evaluated to estimate mean annual precipitation. Chloride deposition from the atmosphere was estimated by analyzing quarterly samples of wet- and dry-deposition for chloride in the bulk gauges and evaluating chloride wet-deposition amounts measured at other locations by the National Atmospheric Deposition Program. Mean chloride concentrations in groundwater were estimated using data from the UGTA Geochemistry Database, data from other reports, and data from samples collected from emplacement boreholes for this study. Calculations were conducted assuming both no underflow and underflow from Kawich Valley and Gold Flat. Model results estimate recharge to be 30 mm/yr with a standard deviation of 18 mm/yr on Pahute Mesa, for elevations >1800 m amsl. These estimates assume Pahute Mesa recharge mixes completely with underflow from Kawich Valley and Gold Flat. The model assumes that precipitation, chloride concentration in bulk deposition, underflow and its chloride concentration, have been constant over the length of time of recharge.
英文关键词	Groundwater recharge on Pahute Mesa was estimated using the chloride mass-balance (CMB) method. This method relies on the conservative properties of chloride to trace its movement from the atmosphere as dry- and wet-deposition through the soil zone and ul
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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/6103
专题	地球科学
推荐引用方式 GB/T 7714	Cooper, Clay A [DRI],Hershey, Ronald L [DRI],Healey, John M [DRI],et al. Estimation of Groundwater Recharge at Pahute Mesa using the Chloride Mass-Balance Method,2013.