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Influence of sediments burying the discharge area of a karst aquifer on the groundwater flow field—Numerical testing of conceptual models

Ohmer, Marc ORCID iD icon 1; Liesch, Tanja ORCID iD icon 1; Goldscheider, Nico 1
1 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)

Abstract:

Karst springs are a natural result of karst water discharging to the surface through unimpeded pathways where the water table meets the surface. This study investigates the impact of alluvial deposits of varying thicknesses and permeabilities burying the main outlet (karst spring) of a well-developed conduit network on karst drainage, including the development of hydraulic heads, drainage patterns and conduit-matrix interactions in response to a positive base-level shift. Numerical testing using FEFLOW on a simplified conceptual model of a hypothetical karst aquifer with six different model configurations was used to examine various drainage structures (with and without flow through a conduit), spring conditions (free vs. partially/fully clogged), sediment cover thickness (20 and 50 m), and hydraulic conductivity of the sediments (low and high). The numerical testing model incorporated one-dimensional discrete feature elements to simulate conduit flow and coupled conduit-matrix interactions. Results indicate that even with a fully plugged outlet, the conduit network remains a significant contributor to the drainage system, collecting water from the matrix in the recharge zone. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000167221
Veröffentlicht am 12.01.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2023
Sprache Englisch
Identifikator ISSN: 0885-6087, 1099-1085
KITopen-ID: 1000167221
Erschienen in Hydrological Processes
Verlag John Wiley and Sons
Band 37
Heft 12
Seiten e15048
Vorab online veröffentlicht am 19.12.2023
Nachgewiesen in Scopus
Dimensions
Web of Science
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