Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR020948 |
Influence of instantaneous and time-averaged groundwater flows induced by waves on the fate of contaminants in a beach aquifer | |
Malott, Spencer1; 39;Carroll, Denis M.2 | |
2017-09-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; Australia |
英文摘要 | Wave-induced water exchange and groundwater flows in beach aquifers impact the fate of contaminants including nutrients, fecal bacteria, and nonaqueous phase liquids (NAPLs). Waves induce high-frequency fluxes in shallow beach sediments. In addition, the phase-averaged effect of waves (wave setup) drives deeper flow recirculations through a beach aquifer. Field data of shallow instantaneous and time-averaged vertical head gradients (fluxes) are first compared with deeper time-averaged fluxes over a period of varying wave conditions. The time-averaged fluxes are equivalent to that which would be simulated assuming a phase-averaged water surface (i.e., wave setup). Based on this comparison, the need to simulate phase-resolved wave motion versus the simplified phase-averaged water surface in predicting contaminant fate is evaluated. While high-frequency fluxes cause large surface water volumes to filter through beach sediments, the exchanging water has a short residence time (<1-70 s). The time-averaged flow behavior captures exchanging water with longer residence time (hours to months) and deeper flow paths. Therefore, consideration of the time-averaged behavior may be sufficient for evaluating dissolved reactive constituents. In contrast, calculations indicate that instantaneous fluxes may need to be considered in evaluating colloidal contaminants (e.g., particulate organic matter and fecal bacteria) as sediment interactions affect their transport and residence time. Finally, multiphase simulations illustrate the differential effect of considering instantaneous versus time-averaged fluxes on the downward migration of NAPL in beach sediments. This study provides an important foundation for future field and modeling efforts focused on understanding and predicting contaminant transport in wave-influenced beaches. |
英文关键词 | groundwater-coastal water interactions contaminant transport field measurements nutrients fecal bacteria NAPL |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413484200028 |
WOS关键词 | FECAL INDICATOR BACTERIA ; PORE-WATER CHEMISTRY ; SWASH-ZONE ; SEDIMENT TRANSPORT ; ESCHERICHIA-COLI ; POROUS-MEDIA ; SANDY BEACH ; SUBTERRANEAN ESTUARY ; NEARSHORE AQUIFER ; FORESHORE SAND |
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/20846 |
专题 | 资源环境科学 |
作者单位 | 1.Western Univ, Dept Civil & Environm Engn, London, ON, Canada; 2.Univ New South Wales, Connected Water Initiat, Sch Civil & Environm Engn, Manly Vale, NSW, Australia |
推荐引用方式 GB/T 7714 | Malott, Spencer,39;Carroll, Denis M.. Influence of instantaneous and time-averaged groundwater flows induced by waves on the fate of contaminants in a beach aquifer[J]. WATER RESOURCES RESEARCH,2017,53(9). |
APA | Malott, Spencer,&39;Carroll, Denis M..(2017).Influence of instantaneous and time-averaged groundwater flows induced by waves on the fate of contaminants in a beach aquifer.WATER RESOURCES RESEARCH,53(9). |
MLA | Malott, Spencer,et al."Influence of instantaneous and time-averaged groundwater flows induced by waves on the fate of contaminants in a beach aquifer".WATER RESOURCES RESEARCH 53.9(2017). |
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