GSTDTAP  > 资源环境科学
DOI10.1029/2019WR026673
Gravity Monitoring of Underground Flash Flood Events to Study Their Impact on Groundwater Recharge and the Distribution of Karst Voids
Watlet, A.1,2,3; Van Camp, M.2; Francis, O.4; Poulain, A.5; Rochez, G.5; Hallet, V.5; Quinif, Y.3; Kaufmann, O.3
2020-04-01
发表期刊WATER RESOURCES RESEARCH
ISSN0043-1397
EISSN1944-7973
出版年2020
卷号56期号:4
文章类型Article
语种英语
国家England; Belgium; Luxembourg
英文摘要

Flash flood events are expected to become increasingly common with the global increases in weather extremes. They are a significant natural hazard that affects karst landscapes, which host large resources of drinking water worldwide. The role played by underground flood events in the karst aquifer recharge is complex due to the heterogeneity of the basement which remains poorly understood. We present the analysis of 20 incave flash flood events affecting the Rochefort karst system (Belgium) using continuous gravity measurements at one single station and water level sensors installed in caves. Underground flood events typically produce a peak in the gravity signal, due to an increase in the associated mass change. After the flood, the gravity values drop but remain slightly increased compared to before the flood event. Via forward gravity modeling, we demonstrate that this remaining anomaly can be reasonably explained by the infiltration of local rainfall within the karst system rather than by allogenic recharge of the aquifer. Flash floods are mainly restricted to connected voids. This allows us to utilize them as proxies to investigate the distribution of cavities in the karst system. Forward modeling of the gravitational attraction induced by the mapped caves being flooded yields a gravity signal much smaller than the observed one. We conclude that at least 50% more cavities than those previously mapped are required to match the measured anomalies. This presents opportunities for implementing similar approaches in other diverse porous media, using gravity monitoring of hydrological processes (e.g., infiltration fronts, hydrothermalism, or tide effects in coastal aquifers) as proxies to characterize underground properties.


Key Points


Gravity signals and water level data of 20 underground flash flood events are used to estimate their impact on the karst aquifer recharge The analysis of gravity data prior and after underground flood events does not suggest any significant recharge in the saturated zone the aquifer Forward gravity modeling of flood events affecting mapped caves evidences unknown cavities in the system


英文关键词karst floods hydrology superconducting gravimeter gravity monitoring
领域资源环境
收录类别SCI-E
WOS记录号WOS:000538987800014
WOS关键词SUPERCONDUCTING GRAVIMETER ; VADOSE ZONE ; TIME-SERIES ; WATER ; CAVE ; HYDROLOGY ; PRECISION ; SIMULATION ; ANOMALIES ; EPIKARST
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/280612
专题资源环境科学
作者单位1.British Geol Survey, Multihazard & Resilience, Nottingham, England;
2.Royal Observ Belgium, Seismol Gravimetry, Uccle, Belgium;
3.Univ Mons, Geol & Appl Geol Unit, Fac Engn, Mons, Belgium;
4.Univ Luxembourg, Fac Sci Technol & Med, Luxembourg, Luxembourg;
5.Univ Namur, Dept Geol, Namur, Belgium
推荐引用方式
GB/T 7714
Watlet, A.,Van Camp, M.,Francis, O.,et al. Gravity Monitoring of Underground Flash Flood Events to Study Their Impact on Groundwater Recharge and the Distribution of Karst Voids[J]. WATER RESOURCES RESEARCH,2020,56(4).
APA Watlet, A..,Van Camp, M..,Francis, O..,Poulain, A..,Rochez, G..,...&Kaufmann, O..(2020).Gravity Monitoring of Underground Flash Flood Events to Study Their Impact on Groundwater Recharge and the Distribution of Karst Voids.WATER RESOURCES RESEARCH,56(4).
MLA Watlet, A.,et al."Gravity Monitoring of Underground Flash Flood Events to Study Their Impact on Groundwater Recharge and the Distribution of Karst Voids".WATER RESOURCES RESEARCH 56.4(2020).
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