Spatial Resolution of Transport Parameters in a Subtropical Karst Conduit System during Dry and Wet Seasons

Citation

Material Information

Title:
Spatial Resolution of Transport Parameters in a Subtropical Karst Conduit System during Dry and Wet Seasons
Series Title:
Hydrogeology Journal
Creator:
Ender, Anna
Goeppert, Nadine
Goldscheider, Nico
Publisher:
Springer Nature
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Tracer Tests ( local )
Analytical Models ( local )
Spatiotemporal Variations ( local )
Karst ( local )
Vietnam ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
Karst aquifers are characterized by a high degree of hydrologic variability and spatial heterogeneity of transport parameters. Tracer tests allow the quantification of these parameters, but conventional point-to-point experiments fail to capture spatiotemporal variations of flow and transport. The goal of this study was to elucidate the spatial distribution of transport parameters in a karst conduit system at different flow conditions. Therefore, six tracer tests were conducted in an active and accessible cave system in Vietnam during dry and wet seasons. Injections and monitoring were done at five sites along the flow system: a swallow hole, two sites inside the cave, and two springs draining the system. Breakthrough curves (BTCs) were modeled with CXTFIT software using the one-dimensional advection-dispersion model and the two-region nonequilibrium model. In order to obtain transport parameters in the individual sections of the system, a multi-pulse injection approach was used, which was realized by using the BTCs from one section as input functions for the next section. Major findings include: (1) In the entire system, mean flow velocities increase from 183 to 1,043 m/h with increasing discharge, while (2) the proportion of immobile fluid regions decrease; (3) the lowest dispersivity was found at intermediate discharge; (4) in the individual cave sections, flow velocities decrease along the flow direction, related to decreasing gradients, while (5) dispersivity is highest in the middle section of the cave. The obtained results provide a valuable basis for the development of an adapted water management strategy for a projected water-supply system.
Original Version:
Hydrogeology Journal, Vol. 26, no. 7 (2018-04-02).

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Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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