Brauchler, Ralf

[["dc.bibliographiccitation.firstpage","33"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Journal of Hydrology"],["dc.bibliographiccitation.lastpage","45"],["dc.bibliographiccitation.volume","384"],["dc.contributor.author","Brauchler, R."],["dc.contributor.author","Hu, R."],["dc.contributor.author","Vogt, T."],["dc.contributor.author","Al-Halbouni, D."],["dc.contributor.author","Heinrich, Steffen"],["dc.contributor.author","Ptak, Thomas"],["dc.contributor.author","Sauter, M."],["dc.date.accessioned","2018-11-07T08:44:03Z"],["dc.date.available","2018-11-07T08:44:03Z"],["dc.date.issued","2010"],["dc.description.abstract","In this study the potential of cross-well slug interference tests for high resolution aquifer characterization of hydraulic heterogeneity was assessed. The cross-well slug interference tests were performed at the research site \"Stegemuhle\", located in the Leine River valley near Gottingen, Germany. The geological composition of the subsurface, consisting mainly of 3.5 m silt and clay overlying 2.5 m sand and gravel, was determined by geophysical well logging and bore core data. To account for lateral changes a refraction seismic survey was conducted. Based on these data an area, characterized by an aquifer thickness of approximately 2 m and an average hydraulic conductivity of 5.0 x 10(-4) m/s (determined by pumping tests), most appropriate for cross-well slug interference tests, was chosen. Altogether 196 cross-well slug interference tests were performed using a tomographic measurement array. The cross-well slug interference tests were evaluated using type curve analysis, which provided detailed information concerning the vertical changes of hydraulic conductivity and specific storage. To assess hydraulic strata connectivity a travel time based tomographic inversion approach was utilized. The potential of the inversion approach to determine lateral changes could be successfully demonstrated by the reconstruction of the pinch out of a high diffusivity layer close to the bottom of the aquifer. The results demonstrate that the combined evaluation of cross-well slug interference tests based on type curve analysis and travel time inversion allows for the development of a detailed model about subsurface hydraulic heterogeneity. (C) 2010 Elsevier B.V. All rights reserved."],["dc.description.sponsorship","German Research Foundation [BF3379/1-2]"],["dc.identifier.doi","10.1016/j.jhydrol.2010.01.004"],["dc.identifier.isi","000276444700004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/20118"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","0022-1694"],["dc.title","Cross-well slug interference tests: An effective characterization method for resolving aquifer heterogeneity"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2013"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Water Resources Research"],["dc.bibliographiccitation.lastpage","2024"],["dc.bibliographiccitation.volume","49"],["dc.contributor.author","Brauchler, R."],["dc.contributor.author","Hu, R."],["dc.contributor.author","Hu, Lening"],["dc.contributor.author","Jimenez, S."],["dc.contributor.author","Bayer, Peter"],["dc.contributor.author","Dietrich, P."],["dc.contributor.author","Ptak, Thomas"],["dc.date.accessioned","2018-11-07T09:26:16Z"],["dc.date.available","2018-11-07T09:26:16Z"],["dc.date.issued","2013"],["dc.description.abstract","A new framework is introduced for hydraulic tomography application and validation in the field. Our motivation is the need for methods that are both efficient and expressive for resolving the spatial distribution of heterogeneous hydraulic properties in aquifers. The presented strategy involves time-efficient field experiments and a computationally efficient inversion scheme. By exploiting the early travel time diagnostics of the hydraulic pressure pulses recorded during tomographic cross-well tests, and new application of attenuation inversion, only short-term pumping tests are required. Many of these can be conducted in one day. The procedure is developed by a numerical experiment with a highly heterogeneous aquifer analogue and then applied to a field case with a shallow, unconsolidated sedimentary aquifer, the Stegemuhle site in Germany. It is demonstrated that the performance of a suite of tomographic short-term pumping tests, data processing and inversion for the reconstruction of heterogeneous diffusivity and specific storage distribution is possible within one day. Additionally, direct-push injection logging is performed at the field site, and the obtained field data is utilized for successful validation of the hydraulic tomograms. We also compare both methods with respect to the necessary requirements, time demand in the field and complexity of interpretation."],["dc.identifier.doi","10.1002/wrcr.20181"],["dc.identifier.isi","000319282100018"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/30265"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Geophysical Union"],["dc.relation.issn","0043-1397"],["dc.title","Rapid field application of hydraulic tomography for resolving aquifer heterogeneity in unconsolidated sediments"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","W03531"],["dc.bibliographiccitation.journal","Water Resources Research"],["dc.bibliographiccitation.volume","48"],["dc.contributor.author","Brauchler, R."],["dc.contributor.author","Doetsch, Joerg"],["dc.contributor.author","Dietrich, P."],["dc.contributor.author","Sauter, M."],["dc.date.accessioned","2018-11-07T09:12:06Z"],["dc.date.available","2018-11-07T09:12:06Z"],["dc.date.issued","2012"],["dc.description.abstract","In this study, hydraulic and seismic tomographic measurements were used to derive a site-specific relationship between the geophysical parameter p-wave velocity and the hydraulic parameters, diffusivity and specific storage. Our field study includes diffusivity tomograms derived from hydraulic travel time tomography, specific storage tomograms, derived from hydraulic attenuation tomography, and p-wave velocity tomograms, derived from seismic tomography. The tomographic inversion was performed in all three cases with the Simultaneous Iterative Reconstruction Technique algorithm, using a ray tracing technique with curved trajectories. The experimental set up was designed such that the p-wave velocity tomogram overlaps the hydraulic tomograms by half. The experiments were performed at a well-characterized sand and gravel aquifer, located in the Leine River valley near Gottingen, Germany. Access to the shallow subsurface was provided by direct-push technology. The high spatial resolution of hydraulic and seismic tomography was exploited to derive representative site-specific relationships between the hydraulic and geophysical parameters, based on the area where geophysical and hydraulic tests were performed. The transformation of the p-wave velocities into hydraulic properties was undertaken using a k-means cluster analysis. Results demonstrate that the combination of hydraulic and geophysical tomographic data is a promising approach to improve hydrogeophysical site characterization."],["dc.description.sponsorship","German Research Foundation [BR3379/1-2]; DOE-LBNL [DE-AC02-05CH11231]"],["dc.identifier.doi","10.1029/2011WR010868"],["dc.identifier.isi","000302247700001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26872"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Geophysical Union"],["dc.relation.issn","1944-7973"],["dc.relation.issn","0043-1397"],["dc.title","Derivation of site-specific relationships between hydraulic parameters and p-wave velocities based on hydraulic and seismic tomography"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","473"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","NEAR SURFACE GEOPHYSICS"],["dc.bibliographiccitation.lastpage","483"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Boehm, G."],["dc.contributor.author","Brauchler, R."],["dc.contributor.author","Nieto, D. Y."],["dc.contributor.author","Baradello, L."],["dc.contributor.author","Affatato, A."],["dc.contributor.author","Sauter, M."],["dc.date.accessioned","2018-11-07T09:19:24Z"],["dc.date.available","2018-11-07T09:19:24Z"],["dc.date.issued","2013"],["dc.description.abstract","In this study the potential of combining high-resolution hydraulic tomographic and geophysical tomographic measurements to define site-specific relationships between geophysical and hydraulic parameters was investigated. We exploit the high-spatial resolution of hydraulic and geophysical tomographic images to define a representative and reliable site-specific relationship, if it exists, over an area, where geophysical and hydraulic tests are performed. The parameters involved in this study were: seismic P-wave velocity derived from seismic tomography; resistivity and electrical conductivity derived from electrical tomography (ERT); diffusivity, hydraulic conductivity and specific storage derived from hydraulic tomography. We derived a site-specific correlation function between the parameters P-wave velocity and diffusivity that shows the highest correlation of all hydraulic and geophysical parameter combinations. The transformation of the P-wave velocity field into a diffusivity field using the estimated site-specific correlation function allowed us to increase the significance of hydraulic tomographic as well as seismic tomographic measurements with respect to the spatial diffusivity distribution in the near subsurface."],["dc.identifier.doi","10.3997/1873-0604.2013034"],["dc.identifier.isi","000325784100001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28628"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","European Assoc Geoscientists & Engineers"],["dc.relation.issn","1873-0604"],["dc.relation.issn","1569-4445"],["dc.title","A field assessment of site-specific correlations between hydraulic and geophysical parameters"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","184"],["dc.bibliographiccitation.issue","3-4"],["dc.bibliographiccitation.journal","Journal of Hydrology"],["dc.bibliographiccitation.lastpage","198"],["dc.bibliographiccitation.volume","345"],["dc.contributor.author","Brauchler, R."],["dc.contributor.author","Cheng, J.-T."],["dc.contributor.author","Dietrich, P."],["dc.contributor.author","Everett, M."],["dc.contributor.author","Johnson, Brian"],["dc.contributor.author","Liedl, Rudolf"],["dc.contributor.author","Sauter, M."],["dc.date.accessioned","2018-11-07T10:57:37Z"],["dc.date.available","2018-11-07T10:57:37Z"],["dc.date.issued","2007"],["dc.description.abstract","We present a hydraulic tomographic inversion strategy with an emphasis on the reduction of ambiguity of hydraulic travel time inversion results and the separation of the estimated diffusivity values into hydraulic conductivity and specific storage. Our tomographic inversion strategy is tested by simulated multilevel. interference slug tests in which the positions of the sources (injection ports) and the receivers (observation ports) isolated with packers are varied. Simulations include the delaying effect of wellbore storage on travel times which are quantified and shown to be of increasing importance for shorter travel distances. For the reduction of ambiguity of travel time inversion, we use the full travel time data set, as well as smaller data subsets of specified source-receiver angles. The inversion results of data subsets show different resolution characteristics and improve the reliability of the interpretation. The travel time of a pressure pulse is a function of the diffusivity of the medium between the source and receiver. Thus, it is difficult to directly derive values for hydraulic conductivity and specific storage by inverting travel times. In order to overcome this limitation, we exploit the great computational efficiency of hydraulic travel. time tomography to define the aquifer structure, which is then input into the underlying groundwater flow model MODFLOW-96. Finally, we perform a model calibration (amplitude inversion) using the automatic parameter estimator PEST, enabling us to separate diffusivity into its two components hydraulic conductivity and specific storage. (C) 2007 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.jhydrol.2007.08.011"],["dc.identifier.isi","000250884600005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/50295"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","0022-1694"],["dc.title","An inversion strategy for hydraulic tomography: Coupling travel time and amplitude inversion"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","514"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Engineering Applications of Computational Fluid Mechanics"],["dc.bibliographiccitation.lastpage","529"],["dc.bibliographiccitation.volume","3"],["dc.contributor.author","Cheng, Jiangtao"],["dc.contributor.author","Brauchler, Ralf"],["dc.contributor.author","Everett, Mark E."],["dc.date.accessioned","2018-11-07T11:21:25Z"],["dc.date.available","2018-11-07T11:21:25Z"],["dc.date.issued","2009"],["dc.description.abstract","During a slug test, injection or withdrawal of a small volume of water through an open borehole in an aquifer induces a pressure pulse propagation process in the aquifer. Hydraulic data sets that are collected during this procedure can be manipulated by mathematical inversion to estimate the hydraulic properties near the borehole. In this paper, we report our finite element forward modeling of slug tests in an aquifer with stratigraphical heterogeneities. Our numerical studies, which resulted in contour plots of head perturbation and travel time, show that the early hydraulic travel time contour associated with partially penetrating slug tests in a heterogeneous aquifer could display a spatial distribution that is quite different from the late travel time contour. While the late travel time contour primarily reflects the integrated effect of widely propagated pressure distribution, the early travel times reflect the preferential flow and therefore can be exploited for hydrostratigraphical imaging of the aquifer. We argue that the early portion of hydraulic signals contains information that is complementary to the conventional peak travel time inversion and plays an indispensable role in gaining enhanced characterization of a geological unit's hydraulic properties. Furthermore, our modeling results demonstrate that early hydraulic travel times are not always associated with the shortest flow path."],["dc.description.sponsorship","Texas Higher Education Coordinating Board, Advanced Technology Program"],["dc.identifier.isi","000276898500006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/55767"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Hong Kong Polytechnic Univ, Dept Civil & Structural Eng"],["dc.relation.issn","1994-2060"],["dc.title","COMPARISON OF EARLY AND LATE TRAVEL TIMES OF PRESSURE PULSES INDUCED BY MULTILEVEL SLUG TESTS"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","350"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Journal of Hydrology"],["dc.bibliographiccitation.lastpage","362"],["dc.bibliographiccitation.volume","409"],["dc.contributor.author","Hu, R."],["dc.contributor.author","Brauchler, R."],["dc.contributor.author","Herold, Maria"],["dc.contributor.author","Bayer, Peter"],["dc.date.accessioned","2018-11-07T08:50:36Z"],["dc.date.available","2018-11-07T08:50:36Z"],["dc.date.issued","2011"],["dc.description.abstract","Travel time and steady shape inversions are complementary methods for tomographic aquifer characterization. In this work, a combined procedure is presented that facilitates determination of spatial hydraulic conductivity and specific storage distributions in heterogeneous groundwater systems. The procedure is applied to a highly heterogeneous sedimentary aquifer analog that is implemented as a two- and three-dimensional case study in a numerical flow model. By interpreting the observations from multiple simulated short-term pumping tests, the main hydraulic features of the analog are successfully reconstructed. The final results demonstrate the encouraging potential of the combined procedure for identifying the dominant structural elements and composition of sedimentary aquifers. However, limits derived from the test design of hydraulic travel time tomography in our synthetic case study prevented us from resolving small scale (10 cm in size) variability of hydraulic conductivity with high discrepancies (up to 5 orders of magnitude). A better reconstruction of the aquifer hydraulic parameters is expected by utilizing a larger amount of measurements, which involve more test and observation intervals, although such a test design would be less feasible for field applications. Still, this newly combined scheme is very attractive for an up-scaled reconstruction on the sub-meter scale. For the present case study, representative parameter values could be estimated in a computationally efficient way. (C) 2011 Elsevier B.V. All rights reserved."],["dc.description.sponsorship","German Research Foundation [BR3379/1-2]"],["dc.identifier.doi","10.1016/j.jhydrol.2011.08.031"],["dc.identifier.isi","000296601600030"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21733"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0022-1694"],["dc.title","Hydraulic tomography analog outcrop study: Combining travel time and steady shape inversion"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","57"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Grundwasser"],["dc.bibliographiccitation.lastpage","67"],["dc.bibliographiccitation.volume","17"],["dc.contributor.author","Brauchler, Ralf"],["dc.contributor.author","Hu, Rui"],["dc.contributor.author","Hu, Linwei"],["dc.contributor.author","Ptak, Thomas"],["dc.date.accessioned","2018-11-07T09:09:55Z"],["dc.date.available","2018-11-07T09:09:55Z"],["dc.date.issued","2012"],["dc.description.abstract","In this study the potential of a hydraulic travel-time based inversion approach with analytical solutions for the evaluation of short term pumping tests is assessed. The data base comprises measurements from short-term pumping tests performed in a sand and gravel aquifer using a tomographic measurement array. The evaluation, which is based on an analytical solution, has shown that it is not possible to delimit aquifer zones with different hydraulic properties. The comparison with multi-level slug tests has revealed that the pumping test results are dominated by a zone with a relatively high hydraulic conductivity located close to the bottom of the aquifer. This finding is surprising due to the short pumping time of 200 seconds and due to the hydraulically isolated pumping and observation intervals. The travel-time based inversion, however, allows the reconstruction of vertical and lateral changes in hydraulic diffusivity, between pumping and observation wells, with a high resolution."],["dc.identifier.doi","10.1007/s00767-011-0185-6"],["dc.identifier.isi","000304398800002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26383"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.publisher.place","Heidelberg"],["dc.relation.issn","1430-483X"],["dc.title","Investigation of hydraulic parameters in unconsolidated sediments: a comparison of methods"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","5504"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Water Resources Research"],["dc.bibliographiccitation.lastpage","5520"],["dc.bibliographiccitation.volume","51"],["dc.contributor.author","Jimenez, S."],["dc.contributor.author","Brauchler, R."],["dc.contributor.author","Hu, R."],["dc.contributor.author","Hu, Lening"],["dc.contributor.author","Schmidt, S."],["dc.contributor.author","Ptak, Thomas"],["dc.contributor.author","Bayer, Peter"],["dc.date.accessioned","2018-11-07T09:54:55Z"],["dc.date.available","2018-11-07T09:54:55Z"],["dc.date.issued","2015"],["dc.description.abstract","A sequential procedure of hydraulic tomographical inversion is applied to characterize at high resolution the spatial heterogeneity of hydraulic conductivity and specific storage at the field test site Stegemuhle, Germany. The shallow aquifer at this site is examined by five short-term multilevel pumping tests with 30 pumping-observation pairs between two wells. Utilizing travel time diagnostics of the recorded pressure response curves, fast eikonal-based inversion is shown to deliver insight into the sedimentary structures. Thus, the structural information from the generated travel time tomogram is exploited to constrain full calibration of the pressure response curves. Based on lateral extrapolation from the measured inter-well profile, a three-dimensional reconstruction of the aquifer is obtained. It is demonstrated that calibration of spatially variable specific storage in addition to hydraulic conductivity can improve the fitting of the model while the structural features are only slightly changed. At the field site, two tracer tests with uranine and sodium-naphthionate were also performed and their concentrations were monitored for 2 months. The measured tracer breakthrough curves are employed for independent validation of the hydraulic tomographical reconstruction. It is demonstrated that major features of the observed solute transport can be reproduced, and structures relevant for macrodispersive tracer spreading could be resolved. However, for the mildly heterogeneous aquifer, the tracer breakthrough curves can also be approximated by a simplified homogeneous model with higher dispersivity. Therefore, improved validation results that capture specific characteristics of the breakthrough curves would require additional hydraulic measurements."],["dc.description.sponsorship","Swiss National Science Foundation [200021_140450/1]; CCES"],["dc.identifier.doi","10.1002/2014WR016402"],["dc.identifier.isi","000360080200034"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36640"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Geophysical Union"],["dc.relation.issn","1944-7973"],["dc.relation.issn","0043-1397"],["dc.title","Prediction of solute transport in a heterogeneous aquifer utilizing hydraulic conductivity and specific storage tomograms"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","W03503"],["dc.bibliographiccitation.journal","Water Resources Research"],["dc.bibliographiccitation.volume","47"],["dc.contributor.author","Brauchler, R."],["dc.contributor.author","Hu, R."],["dc.contributor.author","Dietrich, P."],["dc.contributor.author","Sauter, M."],["dc.date.accessioned","2018-11-07T08:59:07Z"],["dc.date.available","2018-11-07T08:59:07Z"],["dc.date.issued","2011"],["dc.description.abstract","In this study the potential of an inversion approach based on hydraulic travel time and hydraulic attenuation tomography was assessed. Both hydraulic travel time and hydraulic attenuation tomography are based on the transformation of the transient groundwater flow equation into the eikonal equation using an asymptotic approach. The eikonal equation allows the calculation of pressure propagation and attenuation along trajectories, which is computationally efficient. The attenuation and travel time-based inversion approaches are naturally complementary: hydraulic travel times are determined by the hydraulic diffusivity, a combination of hydraulic conductivity and specific storage, whereas the attenuation is determined solely by specific storage. The potential of our hydraulic tomographical approach was investigated at a well-characterized sand and gravel aquifer located in the Leine River valley near Gottingen, Germany. The database for the hydraulic inversion consists of 392 cross-well slug interference tests performed between five wells, in which the positions of the sources (injection ports) and the receivers (observation ports), isolated with double packer systems, were varied between tests. The results have shown that the combination of hydraulic travel time and hydraulic attenuation tomography allows the reconstruction of the diffusivity and storage distribution in two and three dimensions with a resolution and accuracy superior to that possible with type curve analysis."],["dc.description.sponsorship","German Research Foundation [BR3379/1-2]"],["dc.identifier.doi","10.1029/2010WR009635"],["dc.identifier.isi","000288083200004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23814"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Geophysical Union"],["dc.relation.issn","0043-1397"],["dc.title","A field assessment of high-resolution aquifer characterization based on hydraulic travel time and hydraulic attenuation tomography"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]