Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR019480 |
Effect of volcanic dykes on coastal groundwater flow and saltwater intrusion: A field-scale multiphysics approach and parameter evaluation | |
Comte, J. -C.1; Wilson, C.2; Ofterdinger, U.3; Gonzalez-Quiros, A.4 | |
2017-03-01 | |
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:3 |
文章类型 | Article |
语种 | 英语 |
国家 | Scotland; North Ireland; Spain |
英文摘要 | Volcanic dykes are common discrete heterogeneities in aquifers; however, there is a lack of field examples of, and methodologies for, comprehensive in situ characterization of their properties with respect to groundwater flow and solute transport. We have applied an integrated multiphysics approach to quantify the effect of dolerite dykes on saltwater intrusion in a coastal sandstone aquifer. The approach involved ground geophysical imaging (passive magnetics and electrical resistivity tomography), well hydraulic testing, and tidal propagation analysis, which provided constraints on the geometry of the dyke network, the subsurface saltwater distribution, and the sandstone hydrodynamic properties and connectivity. A three-dimensional variable-density groundwater model coupled with a resistivity model was further calibrated using groundwater and geophysical observations. A good agreement of model simulations with tide-induced head fluctuations, geophysically derived pore water salinities, and measured apparent resistivities was obtained when dykes' hydraulic conductivity, storativity, and effective porosity are respectively about 3, 1, and 1 orders of magnitude lower than the host aquifer. The presence of the dykes results in barrier-like alterations of groundwater flow and saltwater intrusion. Preferential flow paths occur parallel to observed dyke orientations. Freshwater inflows from upland recharge areas concentrate on the land-facing side of the dykes and saltwater penetration is higher on their sea-facing side. This has major implications for managing groundwater resources in dyke-intruded aquifers, including in coastal and island regions and provides wider insights on preferential pathways of groundwater flow and transport in highly heterogeneous aquifer systems. |
英文关键词 | coastal aquifers volcanic dykes saltwater intrusion multiphysics characterization variable-density flow modeling parameter evaluation |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000400160500026 |
WOS关键词 | TRIASSIC-SHERWOOD-SANDSTONE ; DATA INCORPORATING TOPOGRAPHY ; SOLUTE TRANSPORT ; DC RESISTIVITY ; SEDIMENTARY AQUIFER ; GEOPHYSICAL-DATA ; SYSTEM ; MODEL ; INVERSION ; WELL |
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/20104 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Aberdeen, Sch Geosci, Aberdeen, Scotland; 2.Univ Ulster, Ctr Sustainable Technol, Sch Built Environm, Newtownabbey, North Ireland; 3.Queens Univ Belfast, Sch Nat & Built Environm, Belfast, Antrim, North Ireland; 4.Univ Oviedo, Hydrogeophys & NDT Modelling Unit, Oviedo, Spain |
推荐引用方式 GB/T 7714 | Comte, J. -C.,Wilson, C.,Ofterdinger, U.,et al. Effect of volcanic dykes on coastal groundwater flow and saltwater intrusion: A field-scale multiphysics approach and parameter evaluation[J]. WATER RESOURCES RESEARCH,2017,53(3). |
APA | Comte, J. -C.,Wilson, C.,Ofterdinger, U.,&Gonzalez-Quiros, A..(2017).Effect of volcanic dykes on coastal groundwater flow and saltwater intrusion: A field-scale multiphysics approach and parameter evaluation.WATER RESOURCES RESEARCH,53(3). |
MLA | Comte, J. -C.,et al."Effect of volcanic dykes on coastal groundwater flow and saltwater intrusion: A field-scale multiphysics approach and parameter evaluation".WATER RESOURCES RESEARCH 53.3(2017). |
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