Geyer, Tobias

[["dc.bibliographiccitation.firstpage","4729"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","HYDROLOGY AND EARTH SYSTEM SCIENCES"],["dc.bibliographiccitation.lastpage","4742"],["dc.bibliographiccitation.volume","17"],["dc.contributor.author","Oehlmann, S."],["dc.contributor.author","Geyer, Tobias"],["dc.contributor.author","Licha, Tobias"],["dc.contributor.author","Birk, S."],["dc.date.accessioned","2018-11-07T09:29:25Z"],["dc.date.available","2018-11-07T09:29:25Z"],["dc.date.issued","2013"],["dc.description.abstract","Due to their heterogeneous nature, karst aquifers pose a major challenge for hydrogeological investigations. Important procedures like the delineation of catchment areas for springs are hindered by the unknown locations and hydraulic properties of highly conductive karstic zones. In this work numerical modeling was employed as a tool in delineating catchment areas of several springs within a karst area in southwestern Germany. For this purpose, different distributive modeling approaches were implemented in the finite element simulation software Comsol Multiphysics (R). The investigation focuses on the question to which degree the effect of karstification has to be taken into account for accurately simulating the hydraulic head distribution and the observed spring discharges. The results reveal that the representation of heterogeneities has a large influence on the delineation of the catchment areas. Not only the location of highly conductive elements but also their geometries play a major role for the resulting hydraulic head distribution and thus for catchment area delineation. The size distribution of the karst conduits derived from the numerical models agrees with knowledge from karst genesis. It was thus shown that numerical modeling is a useful tool for catchment delineation in karst aquifers based on results from different field observations."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2013"],["dc.identifier.doi","10.5194/hess-17-4729-2013"],["dc.identifier.isi","000329061400001"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/9532"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31025"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Copernicus Gesellschaft Mbh"],["dc.relation.issn","1607-7938"],["dc.relation.issn","1027-5606"],["dc.rights","CC BY 3.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/3.0/"],["dc.title","Influence of aquifer heterogeneity on karst hydraulics and catchment delineation employing distributive modeling approaches"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","893"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","HYDROLOGY AND EARTH SYSTEM SCIENCES"],["dc.bibliographiccitation.lastpage","912"],["dc.bibliographiccitation.volume","19"],["dc.contributor.author","Oehlmann, S."],["dc.contributor.author","Geyer, Tobias"],["dc.contributor.author","Licha, Tobias"],["dc.contributor.author","Sauter, M."],["dc.date.accessioned","2018-11-07T10:03:31Z"],["dc.date.available","2018-11-07T10:03:31Z"],["dc.date.issued","2015"],["dc.description.abstract","Assessing the hydraulic parameters of karst aquifers is a challenge due to their high degree of heterogeneity. The unknown parameter field generally leads to a high ambiguity for flow and transport calibration in numerical models of karst aquifers. In this study, a distributed numerical model was built for the simulation of groundwater flow and solute transport in a highly heterogeneous karst aquifer in south-western Germany. Therefore, an interface for the simulation of solute transport in one-dimensional pipes was implemented into the software COMSOL Multiphysics (R) and coupled to the three-dimensional solute transport interface for continuum domains. For reducing model ambiguity, the simulation was matched for steady-state conditions to the hydraulic head distribution in the model area, the spring discharge of several springs and the transport velocities of two tracer tests. Furthermore, other measured parameters such as the hydraulic conductivity of the fissured matrix and the maximal karst conduit volume were available for model calibration. Parameter studies were performed for several karst conduit geometries to analyse the influence of the respective geometric and hydraulic parameters and develop a calibration approach in a large-scale heterogeneous karst system. Results show that it is possible not only to derive a consistent flow and transport model for a 150 km(2) karst area but also to combine the use of groundwater flow and transport parameters thereby greatly reducing model ambiguity. The approach provides basic information about the conduit network not accessible for direct geometric measurements. The conduit network volume for the main karst spring in the study area could be narrowed down to approximately 100 000 m(3)."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2014"],["dc.identifier.doi","10.5194/hess-19-893-2015"],["dc.identifier.isi","000350557400016"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11650"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38483"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Copernicus Gesellschaft Mbh"],["dc.relation.issn","1607-7938"],["dc.relation.issn","1027-5606"],["dc.rights","CC BY 3.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/3.0/"],["dc.title","Reducing the ambiguity of karst aquifer models by pattern matching of flow and transport on catchment scale"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]