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DOI | 10.1029/2017WR021831 |
No Direct Linkage Between Event-Based Runoff Generation and Groundwater Recharge on the Maimai Hillslope | |
Gabrielli, C. P.1; McDonnell, J. J.1,2 | |
2018-11-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2018 |
卷号 | 54期号:11页码:8718-8733 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; England |
英文摘要 | Hillslope hydrological investigations in humid regions to date have focused mostly on runoff generation during events. The few papers that have also examined groundwater recharge processes associated with subsurface stormflow production have found strong linkages between episodes of runoff and recharge to the aquifer. But the range of climate, vegetation, and geological conditions examined thus far has been limited. Here we explore how geologic characteristics, timing of subsurface stormflow, and hydroclimatic conditions relate to the timing of bedrock groundwater recharge at the well-studied Maimai watershed. We hypothesized that recharge would be determined by subsurface stormflow frequency in this system with high rainfall and little seasonality of the hydrologic response. Unexpectedly, isotopic analysis and noble gas measurements indicated that recharge occurred almost exclusively during winter months despite previous work at Maimai showing subsurface stormflow occurs in all seasons and rainfall-runoff ratios are high year-round. A sprinkler and dye experiment conducted directly on open bedrock identified groundwater recharge mechanisms and rates, and a simple empirical recharge model suggests almost 90% of recharge occurred from only 55% of annual precipitation. We found no correlation between the timing and magnitude of groundwater recharge and total precipitation, direct runoff or subsurface stormflow. The catchment effectively converted rainfall to runoff during all seasons, but the unfractured low permeability bedrock (2.3 x 10(-8) m/s) required long durations of extended catchment wetness for appreciable recharge to occur-a condition satisfied only during winter months with lower evapotranspiration. These findings suggest the need to better understand the geologic controls of recharge in headwaters. |
英文关键词 | recharge groundwater noble gas recharge temperatures runoff generation critical zone hydrology |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000453369400010 |
WOS关键词 | WATER-BALANCE ; SUBSURFACE STORMFLOW ; HYDRAULIC CONDUCTIVITY ; BEDROCK GROUNDWATER ; HYDROLOGIC-RESPONSE ; PREFERENTIAL FLOW ; RESIDENCE TIMES ; SOUTH ISLAND ; RAINFALL ; STREAMFLOW |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/20428 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Saskatchewan, Global Inst Water Secur, Saskatoon, SK, Canada; 2.Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham, W Midlands, England |
推荐引用方式 GB/T 7714 | Gabrielli, C. P.,McDonnell, J. J.. No Direct Linkage Between Event-Based Runoff Generation and Groundwater Recharge on the Maimai Hillslope[J]. WATER RESOURCES RESEARCH,2018,54(11):8718-8733. |
APA | Gabrielli, C. P.,&McDonnell, J. J..(2018).No Direct Linkage Between Event-Based Runoff Generation and Groundwater Recharge on the Maimai Hillslope.WATER RESOURCES RESEARCH,54(11),8718-8733. |
MLA | Gabrielli, C. P.,et al."No Direct Linkage Between Event-Based Runoff Generation and Groundwater Recharge on the Maimai Hillslope".WATER RESOURCES RESEARCH 54.11(2018):8718-8733. |
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