Simulating seawater intrusion in a complex coastal karst aquifer using an improved variable-density flow and solute transport–conduit flow process model

Xu, Zhongyuan; Hu, Bill X.; Xu, Zexuan; Wu, Xiujie

doi:10.1007/s10040-018-1903-2

Simulating seawater intrusion in a complex coastal karst aquifer using an improved variable-density flow and solute transport–conduit flow process model

Journal Article · Tue Jan 01 23:00:00 EST 2019 · Hydrogeology Journal

DOI:https://doi.org/10.1007/s10040-018-1903-2· OSTI ID:1572016

Xu, Zhongyuan ^[1]; Hu, Bill X. ^[2]; Xu, Zexuan ^[3]; Wu, Xiujie ^[4]

Univ. of Delaware, Newark, DE (United States); Chengdu Univ. of Technology, Chengdu (China)
China Univ. of Geosciences (Beijing), Beijing (People's Republic of China); The Jinan Univ., Guangzhou (People's Republic of China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Chengdu Univ. of Technology, Chengdu (China)

VDFST-CFP (variable-density flow and solute transport–conduit flow process) is a density-dependent discrete-continuum numerical model for simulating seawater intrusion in a dual-permeability coastal karst aquifer. A previous study (Xu and Hu 2017) simulates variable-density flow only in a single conduit, and studies the parameter sensitivities only in the horizontal case (2D domain as horizontal section) by the VDFST-CFP model. This paper focuses on the density-dependent vertical case (2D domain as vertical section) with two major improvements: 1) when implementing double-conduit networks in the domain, simulated intruded plumes in the porous medium are extended in the double-conduit scenario, compared to the single-conduit system; 2) by quantifying micro-textures on the conduit wall by the Goudar-Sonnad equation and considering macro-structures as local head loss. Sensitivity analysis shows that medium hydraulic conductivity, conduit diameter and effective porosity are important parameters for simulating seawater intrusion in the discrete-continuum system. On the other hand, rougher micro-structures and additional macro-structure components on the conduit wall would reduce the distance of seawater intrusion to the conduit system, but, rarely affect salinity distribution in the matrix. Compared to the equivalent mean roughness height, the new method (with more detailed description of structure) simulates seawater intrusion slightly landward in the conduit system. Here, the macro-structure measured by local head loss is more reasonable but needs further study on conduit flow. Xu and Hu (2017) Development of a discrete-continuum VDFST-CFP numerical model for simulating seawater intrusion to a coastal karst aquifer with a conduit system.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1572016

Journal Information:: Hydrogeology Journal, Journal Name: Hydrogeology Journal Journal Issue: 4 Vol. 27; ISSN 1431-2174

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (3)

Groundwater Throughflow and Seawater Intrusion in High Quality Coastal Aquifers Costall, A. R.; Harris, B. D.; Teo, B. Scientific Reports, Vol. 10, Issue 1 https://doi.org/10.1038/s41598-020-66516-6	journal	June 2020
Groundwater Throughflow and Seawater Intrusion in High Quality Coastal Aquifers Costall, A. R.; Harris, B. D.; Teo, B. RWTH Aachen University https://doi.org/10.18154/rwth-2020-06316	text	January 2020
Analysis of the Saltwater Wedge in a Coastal Karst Aquifer with a Double Conduit Network, Numerical Simulations and Sensitivity Analysis Feo, Alessandra; Zanini, Andrea; Petrella, Emma Water, Vol. 11, Issue 11 https://doi.org/10.3390/w11112311	journal	November 2019

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