DOI: 10.5194/hess-22-1563-2018
Scopus记录号: 2-s2.0-85042710871
论文题名: Imaging groundwater infiltration dynamics in the karst vadose zone with long-term ERT monitoring
作者: 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
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2018
卷: 22, 期: 2 起始页码: 1563
结束页码: 1592
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79370
Appears in Collections: 气候变化事实与影响
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作者单位: Geology and Applied Geology Unit, Faculty of Engineering, University of Mons, Place du Parc 20, Mons, Belgium; Seismology-Gravimetry, Royal Observatory of Belgium, Avenue Circulaire 3, Uccle, 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, France; Department of Geology, University of Namur, Rue de Bruxelles 61, Namur, Belgium; British Geological Survey, Environmental Science Centre, Keyworth, Nottingham, United Kingdom
Recommended Citation:
Watlet A,, Kaufmann O,, Triantafyllou A,et al. Imaging groundwater infiltration dynamics in the karst vadose zone with long-term ERT monitoring[J]. Hydrology and Earth System Sciences,2018-01-01,22(2)