Surface and subsurface water balance estimation by the groundwater recharge model and a 3-D two-phase flow model

A Tsutsumi, K Jinno, Ronny Berndtsson

Research output: Contribution to journalArticlepeer-review

Abstract

Land development often results in adverse environmental impact for surface
and subsurface water systems. For areas close to the coast, land changes may also
result in seawater intrusion into coastal aquifers. Due to this, it is important to evaluate
potential adverse effects in advance of any land development. For evaluation purposes
a combined groundwater recharge model is proposed with a quasi three-dimensional
unconfined groundwater flow equation. The catchment water balance for a planned
new campus area of Kyushu University in southern Japan, was selected as a case study
to test the model approach. Since most of the study area is covered with forest, the
proposed groundwater recharge model considers rainfall interception by forest canopy.
The results show that simulated groundwater and surface runoff agree well with
observations. It is also shown that actual evapotranspiration, including rainfall
interception by forest canopy, is well represented in the proposed simulation model.
Several hydrological components such as direct surface runoff rate, groundwater
spring flow rate to a ground depression, trans-basin groundwater flow etc., were also
investigated.
Original languageEnglish
Pages (from-to)205-226
JournalHydrological Sciences Journal
Volume49
Issue number2
Publication statusPublished - 2004

Subject classification (UKÄ)

  • Water Engineering

Free keywords

  • evapotranspiration
  • rainfall interception
  • land-use change
  • quasi three-dimensional twophasegroundwater flow
  • shallow groundwater
  • groundwater recharge model
  • basin-scalewater balance

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