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Combining Multi-temporal Electric Resistivity Tomography and Predictive Algorithms for supporting aquifer monitoring and management 结合多时相电阻率层析成像和预测算法支持含水层监测和管理
NSG2021 1st Conference on Hydrogeophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120034
V. Giampaolo, P. Dell’Aversana, L. Capozzoli, G. Martino, E. Rizzo
{"title":"Combining Multi-temporal Electric Resistivity Tomography and Predictive Algorithms for supporting aquifer monitoring and management","authors":"V. Giampaolo, P. Dell’Aversana, L. Capozzoli, G. Martino, E. Rizzo","doi":"10.3997/2214-4609.202120034","DOIUrl":"https://doi.org/10.3997/2214-4609.202120034","url":null,"abstract":"Summary This work presents the results of geophysical data prediction by applying statistical and predictive algorithms to a multi-temporal Electric Resistivity Tomography dataset. A cross-hole time-lapse resistivity survey was carried out during an experiment addressed to monitor a tracer diffusion in a real aquifer. In order to retrieve a number of “predicted” pseudo sections of apparent resistivity values, we applied the Vector Autoregressive (VAR) and Recurrent Neural Network (RNN) algorithms over a sequence of 18 ERT surveys. Real and predicted dataset allow to delineate plume evolution under 30 m depth, describing a complex transport pathway influenced by hydraulic properties of the studied aquifer.","PeriodicalId":396561,"journal":{"name":"NSG2021 1st Conference on Hydrogeophysics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116961368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Groundwater Dynamics in Karst Hydrosystem Unsaturated Zone; Evidences from a 2-years SNMR Monitoring 岩溶水系非饱和带地下水动力学研究2年SNMR监测的证据
NSG2021 1st Conference on Hydrogeophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120091
K. Chalikakis, N. Mazzilli, S. Carrière, G. Massonnat, C. Danquigny, A. Legchenko
{"title":"Groundwater Dynamics in Karst Hydrosystem Unsaturated Zone; Evidences from a 2-years SNMR Monitoring","authors":"K. Chalikakis, N. Mazzilli, S. Carrière, G. Massonnat, C. Danquigny, A. Legchenko","doi":"10.3997/2214-4609.202120091","DOIUrl":"https://doi.org/10.3997/2214-4609.202120091","url":null,"abstract":"Summary The unsaturated zone (UZ) of karst aquifers plays an important role in groundwater recharge processes. Comprehensive knowledge of UZ structure and hydrodynamic functioning is a key to better assess and manage groundwater resources in karst. In this extended abstract we present the results from a 2-year long Surface Nuclear Magnetic Resonance (SNMR) monitoring implemented in the Low-Noise Underground Laboratory (LSBB) site located within the Fontaine de Vaucluse karst hydrosystem in south-France. This exceptional 2-years SNMR monitoring demonstrated the efficiency of SNMR firstly to assess and validate the permanent presence of groundwater within karst hydrosystem UZ and secondly to monitor his temporal variations. Compared to boreholes, SNMR provides an integrated but accurate estimation of groundwater dynamics without disturbing the media.","PeriodicalId":396561,"journal":{"name":"NSG2021 1st Conference on Hydrogeophysics","volume":"665 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120940357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Validation of a newly developed surface NMR system 新开发的表面核磁共振系统的验证
NSG2021 1st Conference on Hydrogeophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120080
D. J. Okholm
{"title":"Validation of a newly developed surface NMR system","authors":"D. J. Okholm","doi":"10.3997/2214-4609.202120080","DOIUrl":"https://doi.org/10.3997/2214-4609.202120080","url":null,"abstract":"Summary The surface NMR system, Apsu, is a newly developed system, focused on the shallow subsurface. The system shows promising results regarding resolution of the shallow subsurface as well as in relation to collection of field data in less remote areas. Additionally, field measurements are fast and efficient, thus increasing the value of the system even further. The Apsu system’s capabilities of resolving the water table depth is tested through synthetic analysis. This analysis uses the standard deviation factor as a measure of the sensitivity of the system. Further, different loop configurations are tested for the system to examine their influence on the sensitivity.","PeriodicalId":396561,"journal":{"name":"NSG2021 1st Conference on Hydrogeophysics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126161311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Geophysical Characterization of Alluvial Aquifers in Plutonic and Volcanic Semi-Arid Andes Using Electromagnetic Methods. 用电磁方法表征深部和火山半干旱安第斯地区冲积含水层。
NSG2021 1st Conference on Hydrogeophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120059
G. D. Pasquale, Rémi Valois, E. Bresciani, P. Alvarez
{"title":"Geophysical Characterization of Alluvial Aquifers in Plutonic and Volcanic Semi-Arid Andes Using Electromagnetic Methods.","authors":"G. D. Pasquale, Rémi Valois, E. Bresciani, P. Alvarez","doi":"10.3997/2214-4609.202120059","DOIUrl":"https://doi.org/10.3997/2214-4609.202120059","url":null,"abstract":"Summary Drought periods are common events in the semi-arid zone of Chile and their length and frequency has increased with climate change. Within periods of water resource stresses, subsurface water exploitation increases with the use of deeper wells for irrigation and drinking water supplies. Moreover, in case of severe droughts, aquifers could contain a reserve to mitigate the drought. Within this study, we aim to test the feasibility of electromagnetic geophysical methods to map groundwater reserve in a mountainous watershed of the semi-arid Andes, characterized by narrow valleys alluvial fillings within plutonic and volcanic sequences. The area of study is part of the Limari catchment, in the Coquimbo Region, where information about the amount of underground water available and its depth is scarce. Here we present the first results, interpretation and limitations of the application of transient electromagnetic (TEM) and magnetic resonance soundings (MRS) for the characterization of the Limari catchment alluvial aquifers.","PeriodicalId":396561,"journal":{"name":"NSG2021 1st Conference on Hydrogeophysics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122023300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Geophysical characterization of near-surface formations in the La Villa River catchment (Los Santos, Panama) La Villa河流域(Los Santos, Panama)近地表地层的地球物理特征
NSG2021 1st Conference on Hydrogeophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120088
F. Rejiba, A. Mojica, M. Schmutz, A. Ruiz, M.G. Castrellón, J. L. D. Guevara, S. Saavedra, J. Fábrega, C. Finco, C. Schamper, L. C. Fraga, M. Llubes
{"title":"Geophysical characterization of near-surface formations in the La Villa River catchment (Los Santos, Panama)","authors":"F. Rejiba, A. Mojica, M. Schmutz, A. Ruiz, M.G. Castrellón, J. L. D. Guevara, S. Saavedra, J. Fábrega, C. Finco, C. Schamper, L. C. Fraga, M. Llubes","doi":"10.3997/2214-4609.202120088","DOIUrl":"https://doi.org/10.3997/2214-4609.202120088","url":null,"abstract":"Summary The central Pacific Region (Panama) is known to suffer from water scarcity during periods of extended drought. The groundwater/surface water interactions and dynamics, provided by conceptual or numerical models are crucial for water resource management. At the regional scale, such models generally lack of structural information concerning the internal variability of the near surface formations. The spatialization of the direct observations from sparse boreholes can only achieved by geophysical investigations. The aim of this work is to characterize, in the La Villa groundwater basin, the near surface aquifer located in the lateritic horizon using electrical resistivity imaging (ERI), vertical electrical soundings (VES) and time domain electromagnetic soundings (TDEM). This case study illustrates the relevance of the use coupled ERI, TDEM and VES to describe the near surface variability due to the leaching of the lateritic horizon as well as the level of the water table.","PeriodicalId":396561,"journal":{"name":"NSG2021 1st Conference on Hydrogeophysics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129265120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Identifying Ice-Rich Layers in Rock Glaciers Using Geophysics: A Case Study in the Andes 利用地球物理学识别岩石冰川中的富冰层:以安第斯山脉为例
NSG2021 1st Conference on Hydrogeophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120064
G. D. Pasquale, Rémi Valois, Shelley A. MacDonell, N. Schaefer
{"title":"Identifying Ice-Rich Layers in Rock Glaciers Using Geophysics: A Case Study in the Andes","authors":"G. D. Pasquale, Rémi Valois, Shelley A. MacDonell, N. Schaefer","doi":"10.3997/2214-4609.202120064","DOIUrl":"https://doi.org/10.3997/2214-4609.202120064","url":null,"abstract":"Summary Rock glaciers play an important hydrological role in the semi-arid Andes, by providing water to streamflow when water needs are the most. Identifying if a rock glacier contains more or less ice is not an easy task, because most of the time, the ice is buried below rock blocks. Surface based geophysics can be a way to assess ice content, even tough calibration or ground truth is necessary to properly give any quantitative figure. This study aims to identify ice rich layers using geophysics on two Rock Glaciers (RG): an active and inactive one. Electrical Resistivity Tomography (ERT), Seismic Refraction Tomography (SRT) and Ground Penetrating Radar (GPR) surveys were carried out on those two RG. Seismic velocities and resistivity are higher in the active RG, which is in agreement with a higher ice content. Whilst velocities are in still in the usual geological range, resistivities are really high, which is not abnormal in the absence of liquid water or clay minerals. Interpretating resistivities only could led to misunderstandings because high resistivities could be seen as ice. The two RGs show a distinct signature regarding seismic velocities and resistivities, which demonstrate the potential of those tools to characterize RG.","PeriodicalId":396561,"journal":{"name":"NSG2021 1st Conference on Hydrogeophysics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130396965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Passive Seismic Monitoring of a Karst Aquifer During Flood Events. 洪水期间岩溶含水层的被动地震监测。
NSG2021 1st Conference on Hydrogeophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120069
A. Nader, J. Albaric, A. Marchand, M. Gros, M. Steinmann, B. Fores, V. Stefani, B. Pohl, H. Celle‐Jeanton, C. Sue
{"title":"Passive Seismic Monitoring of a Karst Aquifer During Flood Events.","authors":"A. Nader, J. Albaric, A. Marchand, M. Gros, M. Steinmann, B. Fores, V. Stefani, B. Pohl, H. Celle‐Jeanton, C. Sue","doi":"10.3997/2214-4609.202120069","DOIUrl":"https://doi.org/10.3997/2214-4609.202120069","url":null,"abstract":"Summary Karst aquifers are considered challenging sites for monitoring. They endure various behaviors during floods due to their heterogeneous structure and complex recharge mechanisms. This shows that multiple parameters should interfere as well as multiple methods emerging from different disciplines should be used to investigate such environments. This work is held with the objective of identifying the dynamics of superficial and deep water flows in a karst environment. Taking Fourbanne’s aquifer as a case study, we show in the following the ability of seismic noise combined with hydrological data to detect water flows and bedload transport in the vicinity of the underground conduit. This study is a part of the SISMEAUCLIM project that aims to develop a new approach to temporal monitoring of karst aquifers, subject to floods by analyzing jointly seismological, hydrogeological, and atmospheric data.","PeriodicalId":396561,"journal":{"name":"NSG2021 1st Conference on Hydrogeophysics","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126978971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluating the cause of TDIP signals in woochips-filled infiltration trenches for treated wastewater 木屑填料入渗沟处理废水中TDIP信号产生原因分析
NSG2021 1st Conference on Hydrogeophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120089
L. Delgado-Gonzalez, V. Dubois, L. Lassabatère, J. Aubert, C. Boutin, M. Séger, R. Clément
{"title":"Evaluating the cause of TDIP signals in woochips-filled infiltration trenches for treated wastewater","authors":"L. Delgado-Gonzalez, V. Dubois, L. Lassabatère, J. Aubert, C. Boutin, M. Séger, R. Clément","doi":"10.3997/2214-4609.202120089","DOIUrl":"https://doi.org/10.3997/2214-4609.202120089","url":null,"abstract":"Summary Soil infiltration is regularly practised downstream of wastewater treatment plants, particularly in areas without surface water systems. In France, stakeholders are considering the use of biodegradable and renewable material such as woodchips. This material has two main advantages: it has a high capillarity, thus a great capacity for water retention, and it amends the soil with carbon improving its structure. Moreover, woodchips have been told to promote biodiversity in particular for bioturbating species like earthworms, which play a major role regarding soil structure and organic matter transport into the soil. Such macrofaune is expected to promote water infiltration for poorly infiltrating capacity soils and to limit soil clogging caused by the infiltration of treated wastewater. In this study, we evaluate the interaction between woodchips and loamy soils on woodchip-filled trenches operated for 2 to 6 years using a non-destructive geophysical approach: Electrical Resistivity Tomography (ERT) and Time Domain Induced Polarisation (TDIP). ERT provided information of the structure of the soil under the woodchip-filled trenches, but anything could be said about the impact of such system in the soil. By contrast, TDIP showed significant variations of the signal around the trenches which may result from the presence of organic matter.","PeriodicalId":396561,"journal":{"name":"NSG2021 1st Conference on Hydrogeophysics","volume":"212 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132368934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Data-driven hydrogeophysical and redox modelling 数据驱动的水文地球物理和氧化还原模拟
NSG2021 1st Conference on Hydrogeophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120078
N. Claes, N. Foged, T. Vilhelmsen, R. R. Frederiksen, H. Kim, A. Christiansen
{"title":"Data-driven hydrogeophysical and redox modelling","authors":"N. Claes, N. Foged, T. Vilhelmsen, R. R. Frederiksen, H. Kim, A. Christiansen","doi":"10.3997/2214-4609.202120078","DOIUrl":"https://doi.org/10.3997/2214-4609.202120078","url":null,"abstract":"Summary Detailed 3D structural information of the subsurface is fundamental for development of both the hydrological and the geochemical models that can be used for analysis of nitrate reduction processes in the subsurface and targeted nitrate regulation. In some areas data, coverage might be sparse or suffering from bad data quality, which results in information gaps. We suggest therefore a workflow that merges tTEM resistivity data and borehole lithologies, and uses these datasets to generate an ensemble of equally plausible 3D models of hydrogeological units and redox conditions. In an initial step the input datasets are merged via accumulated clay thickness modeling. This dataset is in a second step transformed into a training image, that is to be used in multipoint statistical simulations. The application of Direct Sampling within this workflow allows for simultaneous simulation of these variables. This approach allows for retaining the complex geostatistical spatial relationships that can exist between the different datasets in the resulting generated 3D models.","PeriodicalId":396561,"journal":{"name":"NSG2021 1st Conference on Hydrogeophysics","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115092915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Integrated analysis of the coastal aquifer system of Thorikos Valley, Attica, Greece 希腊阿提卡托里科斯河谷沿海含水层系统的综合分析
NSG2021 1st Conference on Hydrogeophysics Pub Date : 2021-08-29 DOI: 10.3997/2214-4609.202120044
G. Apostolopoulos, C. Pouliaris, S. Karizonis, M. Perdikaki, A. Kallioras
{"title":"Integrated analysis of the coastal aquifer system of Thorikos Valley, Attica, Greece","authors":"G. Apostolopoulos, C. Pouliaris, S. Karizonis, M. Perdikaki, A. Kallioras","doi":"10.3997/2214-4609.202120044","DOIUrl":"https://doi.org/10.3997/2214-4609.202120044","url":null,"abstract":"Summary An integrated study is presented with the combination of a series of hydrogeological and geophysical investigations that took place in the coastal aquifer system of Thorikos valley (Attica Region, Greece). Both studies prove that seawater intrusion is an ongoing hydrologic process that takes place within both aquifer layers of the investigated area. The extent of the seawater intrusion front is limited within the coastal zone, while the piezometric conditions suggest that this is a passive type of intrusion. A FEM map of the subtraction of conductivities for two effective depths (HCP mode) shows great similarity with the distribution of chloride ions in the alluvial aquifer.","PeriodicalId":396561,"journal":{"name":"NSG2021 1st Conference on Hydrogeophysics","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115505529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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