DOI: 10.5194/hess-23-2321-2019
论文题名: Hydrogeological conceptual model of andesitic watersheds revealed by high-resolution heliborne geophysics
作者: Vittecoq B. ; Reninger P.-A. ; Lacquement F. ; Martelet G. ; Violette S.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期: 5 起始页码: 2321
结束页码: 2338
语种: 英语
Scopus关键词: Aquifers
; Catchments
; Groundwater flow
; Groundwater resources
; Hydraulic conductivity
; Hydrogeology
; Lithology
; Structural geology
; Time domain analysis
; Volcanoes
; Water management
; Geological formation
; Geological structures
; High heterogeneity
; High hydraulic conductivities
; Hydrogeological characteristics
; Hydrogeological conceptual model
; Time domain electromagnetics
; Volcanic structures
; Watersheds
; aquifer
; aquitard
; catchment
; geological survey
; geophysics
; groundwater flow
; hydraulic conductivity
; hydrogeology
; hydrological modeling
; preferential flow
; volcanic island
; watershed
; Martinique
; Windward Islands [Lesser Antilles]
英文摘要: We conducted a multidisciplinary study at the watershed scale of an andesitic-type volcanic island in order to better characterize the hydrogeological functioning of aquifers and to better evaluate groundwater resources. A heliborne Time Domain ElectroMagnetic (TDEM) survey was conducted over Martinique in order to investigate underground volcanic structures and lithology, characterized by high lateral and vertical geological variability and resulting in a very high heterogeneity of their hydrogeological characteristics. Correlations were made on three adjacent watersheds between resistivity data along flight lines and geological and hydrogeological data from 51 boreholes and 24 springs, showing that the younger the formations, the higher their resistivity. Correlation between resistivity, geology and transmissivity data of three aquifers is attested: within the interval 10-100ohmm and within a range of 1 to 5.5Ma, the older the formation, the lower its resistivity, and the older the formation, the higher its transmissivity. Moreover, we demonstrate that the main geological structures lead to preferential flow circulations and that hydrogeological watersheds can differ from topographical watersheds. The consequence is that, even if the topographical watershed is small, underground flows from an adjacent watershed can add significant amounts of water to such a catchment. This effect is amplified when lava domes and their roots are situated upstream, as they present very high hydraulic conductivity leading to deep preferential groundwater flow circulations. We also reveal, unlike basaltic-type volcanic islands, that hydraulic conductivity increases with age in this andesitic-type volcanic island. This trend is interpreted as the consequence of tectonic fracturing associated with earthquakes in this subduction zone, related to andesitic volcanic islands. Finally, our approach allows characterization in detail of the hydrogeological functioning and identification of the properties of the main aquifer and aquitard units, leading to the proposition of a hydrogeological conceptual model at the watershed scale. This working scale seems particularly suitable due to the complexity of edifices, with heterogeneous geological formations presenting high lateral and vertical variability. Moreover, our study offers new guidelines for accurate correlations between resistivity, geology and hydraulic conductivity for volcanic islands. Finally, our results will also help stakeholders toward a better management of water resources. © 2019 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162973
Appears in Collections: 气候变化与战略
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作者单位: Vittecoq, B., BRGM, Fort-de-France-Martinique, 97200, France, ENS-PSL Research University, CNRS, UMR.8538, Laboratoire de Géologie, 24 rue Lhomond, Paris, 75231, France; Reninger, P.-A., BRGM, Orléans, 45060, France; Lacquement, F., BRGM, Orléans, 45060, France; Martelet, G., BRGM, Orléans, 45060, France; Violette, S., ENS-PSL Research University, CNRS, UMR.8538, Laboratoire de Géologie, 24 rue Lhomond, Paris, 75231, France, Sorbonne Université, UFR.918, Paris, 75005, France
Recommended Citation:
Vittecoq B.,Reninger P.-A.,Lacquement F.,et al. Hydrogeological conceptual model of andesitic watersheds revealed by high-resolution heliborne geophysics[J]. Hydrology and Earth System Sciences,2019-01-01,23(5)