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

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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


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Ämnesklassifikation (UKÄ) – OBLIGATORISK

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Sidor (från-till)205-226
TidskriftHydrological Sciences Journal
Utgåva nummer2
StatusPublished - 2004
Peer review utfördJa