DOI: | 10.2172/1113247
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报告号: | 45251
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报告题名: | Estimation of Groundwater Recharge at Pahute Mesa using the Chloride Mass-Balance Method |
作者: | Cooper, Clay A [DRI]; Hershey, Ronald L [DRI]; Healey, John M [DRI]; Lyles, Brad F [DRI]
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出版年: | 2013
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发表日期: | 2013-07-01
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国家: | 美国
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语种: | 英语
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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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中文主题词: | 大气科学
; 降水
; 钻孔
; 地球化学
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主题词: | ATMOSPHERE
; PRECIPITATION
; BOREHOLES
; GEOCHEMISTRY
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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. |
URL: | http://www.osti.gov/scitech/servlets/purl/1113247
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Citation statistics: |
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资源类型: | 研究报告
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标识符: | http://119.78.100.158/handle/2HF3EXSE/41084
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Appears in Collections: | 过去全球变化的重建 影响、适应和脆弱性 科学计划与规划 气候变化与战略 全球变化的国际研究计划 气候减缓与适应 气候变化事实与影响
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1113247.pdf(2662KB) | 研究报告 | -- | 开放获取 | | View
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Recommended Citation: |
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. 2013-01-01.
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