A new numerical benchmark of a freshwater lens

verfasst von

L. Stoeckl, M. Walther, T. Graf

Abstract

A numerical benchmark for 2-D variable-density flow and solute transport in a freshwater lens is presented. The benchmark is based on results of laboratory experiments conducted by Stoeckl and Houben (2012) using a sand tank on the meter scale. This benchmark describes the formation and degradation of a freshwater lens over time as it can be found under real-world islands. An error analysis gave the appropriate spatial and temporal discretization of 1 mm and 8.64 s, respectively. The calibrated parameter set was obtained using the parameter estimation tool PEST. Comparing density-coupled and density-uncoupled results showed that the freshwater-saltwater interface position is strongly dependent on density differences. A benchmark that adequately represents saltwater intrusion and that includes realistic features of coastal aquifers or freshwater lenses was lacking. This new benchmark was thus developed and is demonstrated to be suitable to test variable-density groundwater models applied to saltwater intrusion investigations.

Organisationseinheit(en)

Institut für Strömungsmechanik und Umweltphysik im Bauwesen

Externe Organisation(en)

Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)
Helmholtz-Zentrum für Umweltforschung (UFZ)
Technische Universität Dresden

Typ

Artikel

Journal

Water resources research

Band

52

Seiten

2474-2489

Anzahl der Seiten

16

ISSN

0043-1397

Publikationsdatum

01.04.2016

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Gewässerkunde und -technologie

Ziele für nachhaltige Entwicklung

SDG 6 – Sauberes Wasser und sanitäre Einrichtungen

Elektronische Version(en)

https://doi.org/10.1002/2015WR017989 (Zugang: Offen)