Numerical modelling of saltwater-freshwater interaction in the Walawe River Basin, Sri Lanka

Priyantha Ranjan, So Kazama, Masaki Sawamoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A finite difference model that simulates freshwater and saltwater flow separated by a sharp interface has been applied to estimate the salinity intrusion in the lower part of the Walawe River basin to the southern coastal aquifer, Sri Lanka. The effect of hydrogeological factors on the dynamics of the freshwater-saltwater interface has been considered through storage coefficients, porosity and hydraulic conductivity. The paper concludes that hydraulic conductivity is the main hydrogeological factor affecting the movement of the freshwater-saltwater interface, and the saltwater intrusion is more sensitive to groundwater recharge than hydrogeological properties. Therefore, the model was calibrated by adjusting the hydraulic conductivity to match the observed salinity profile in the southern coastal aquifer. Simulation results compare well with the observed long-term salinity profile suggesting that the numerical model can be used to successfully simulate the salinity profile in the area.

Original languageEnglish
Title of host publicationIAHS-AISH Publication - A New Focus on Groundwater - Seawater Interactions
Pages306-314
Number of pages9
Edition312
Publication statusPublished - 2007 Dec 1
EventInternational Symposium: A New Focus on Groundwater - Seawater Interactions - 24th General Assembly of the International Union of Geodesy and Geophysics (IUGG) - Perugia, Italy
Duration: 2007 Jul 22007 Jul 13

Publication series

NameIAHS-AISH Publication
Number312
ISSN (Print)0144-7815

Other

OtherInternational Symposium: A New Focus on Groundwater - Seawater Interactions - 24th General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Country/TerritoryItaly
CityPerugia
Period07/7/207/7/13

Keywords

  • Coastal groundwater resources
  • Hydrogeology
  • Salinity intrusion
  • Southern coastal aquifer Sri Lanka

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Fingerprint

Dive into the research topics of 'Numerical modelling of saltwater-freshwater interaction in the Walawe River Basin, Sri Lanka'. Together they form a unique fingerprint.

Cite this