气候变化领域集成服务门户(CCPortal): Imaging groundwater infiltration dynamics in the karst vadose zone with long-term ERT monitoring

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DOI	10.5194/hess-22-1563-2018
	Imaging groundwater infiltration dynamics in the karst vadose zone with long-term ERT monitoring
	Watlet A.; Kaufmann O.; Triantafyllou A.; Poulain A.; Chambers J.E.; Meldrum P.I.; Wilkinson P.B.; Hallet V.; Quinif Y.; Van Ruymbeke M.; Van Camp M.
发表日期	2018
ISSN	1027-5606
起始页码	1563
结束页码	1592
卷号	22 期号:2
英文摘要	Water infiltration and recharge processes in karst systems are complex and difficult to measure with conventional hydrological methods. In particular, temporarily saturated groundwater reservoirs hosted in the vadose zone can play a buffering role in water infiltration. This results from the pronounced porosity and permeability contrasts created by local karstification processes of carbonate rocks. Analyses of time-lapse 2-D geoelectrical imaging over a period of 3 years at the Rochefort Cave Laboratory (RCL) site in south Belgium highlight variable hydrodynamics in a karst vadose zone. This represents the first long-term and permanently installed electrical resistivity tomography (ERT) monitoring in a karst landscape. The collected data were compared to conventional hydrological measurements (drip discharge monitoring, soil moisture and water conductivity data sets) and a detailed structural analysis of the local geological structures providing a thorough understanding of the groundwater infiltration. Seasonal changes affect all the imaged areas leading to increases in resistivity in spring and summer attributed to enhanced evapotranspiration, whereas winter is characterised by a general decrease in resistivity associated with a groundwater recharge of the vadose zone. Three types of hydrological dynamics, corresponding to areas with distinct lithological and structural features, could be identified via changes in resistivity: (D1) upper conductive layers, associated with clay-rich soil and epikarst, showing the highest variability related to weather conditions; (D2) deeper and more resistive limestone areas, characterised by variable degrees of porosity and clay contents, hence showing more diffuse seasonal variations; and (D3) a conductive fractured zone associated with damped seasonal dynamics, while showing a great variability similar to that of the upper layers in response to rainfall events. This study provides detailed images of the sources of drip discharge spots traditionally monitored in caves and aims to support modelling approaches of karst hydrological processes. © Author(s) 2018.
语种	英语
scopus关键词	Dynamics; Groundwater; Image enhancement; Landforms; Lime; Lithology; Moisture control; Porosity; Soil moisture; Soil surveys; Electrical resistivity tomography; Geological structures; Ground water recharge; Ground-water infiltration; Hydrological methods; Hydrological process; Permeability contrasts; Seasonal variation; Infiltration; data set; electrical resistivity; evapotranspiration; fracture zone; geological structure; groundwater flow; hydrodynamics; infiltration; karst hydrology; karstification; lithology; porosity; seasonal variation; soil moisture; structural analysis; tomography; vadose zone; Belgium
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160095
作者单位	Watlet, A., Geology and Applied Geology Unit, Faculty of Engineering, University of Mons, Place du Parc 20, Mons, 7000, Belgium, Seismology-Gravimetry, Royal Observatory of Belgium, Avenue Circulaire 3, Uccle, 1180, Belgium; Kaufmann, O., Geology and Applied Geology Unit, Faculty of Engineering, University of Mons, Place du Parc 20, Mons, 7000, Belgium; Triantafyllou, A., Geology and Applied Geology Unit, Faculty of Engineering, University of Mons, Place du Parc 20, Mons, 7000, Belgium, Laboratoire de Planétologie et Géodynamique - Nantes (LPGN), UFR Sciences et Techniques, Université de Nantes, UMR-CNRS 6112, Rue de la Houssinière 2, Nantes Cedex 3, 44322, France; Poulain, A., Department of Geology, University of Namur, Rue de Bruxelles 61, Namur, 5000, Belgium; Chambers, J.E., British Geological Survey, Environmental Science Centre, Keyworth, Nottingham, NG12 5GG, United Kingdom; Meldrum, P.I., British Geological Survey, Environmental Science Centre, Keyworth, Nottingham, NG12 5GG, United Kingdom; Wilki...
推荐引用方式 GB/T 7714	Watlet A.,Kaufmann O.,Triantafyllou A.,et al. Imaging groundwater infiltration dynamics in the karst vadose zone with long-term ERT monitoring[J],2018,22(2).
APA	Watlet A..,Kaufmann O..,Triantafyllou A..,Poulain A..,Chambers J.E..,...&Van Camp M..(2018).Imaging groundwater infiltration dynamics in the karst vadose zone with long-term ERT monitoring.Hydrology and Earth System Sciences,22(2).
MLA	Watlet A.,et al."Imaging groundwater infiltration dynamics in the karst vadose zone with long-term ERT monitoring".Hydrology and Earth System Sciences 22.2(2018).