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Submarine Groundwater Discharge Estimation from Kikuchi River Basin to the Ariake Bay, Japan

Katsuki, Mamoru (2008) In TVVR08/5004
Division of Water Resources Engineering
Abstract
Submarine groundwater discharge (SGD) affects environmental conditions in semi-enclosed sea areas. Semi-enclosed areas often experience eutrophication caused by excess nutrient transport from agricultural areas. However, it is often unclear how much the nutrients that are transported through the groundwater discharge. Therefore, it is necessary to quantify groundwater discharge to the sea. For this quantification, a methodology to estimate SGD is presented. A distributed groundwater recharge model (GRM) and a groundwater flow model (GFM) were developed and coupled to estimate SGD from Kikuchi River basin into the Ariake Bay, Kumamoto, Kyushu, Japan. The river basin located in Kumamoto prefecture was studied as a representative area for the... (More)
Submarine groundwater discharge (SGD) affects environmental conditions in semi-enclosed sea areas. Semi-enclosed areas often experience eutrophication caused by excess nutrient transport from agricultural areas. However, it is often unclear how much the nutrients that are transported through the groundwater discharge. Therefore, it is necessary to quantify groundwater discharge to the sea. For this quantification, a methodology to estimate SGD is presented. A distributed groundwater recharge model (GRM) and a groundwater flow model (GFM) were developed and coupled to estimate SGD from Kikuchi River basin into the Ariake Bay, Kumamoto, Kyushu, Japan. The river basin located in Kumamoto prefecture was studied as a representative area for the entire Ariake Bay catchment. The GRM separates rainfall into direct runoff, evapotranspiration, and groundwater recharge. Parameters are set based on land use. Groundwater level was calculated by the GFM to estimate subsurface water runoff, base flow to the river, and evaporation from the shallow groundwater table. The SGD was calculated using a water balance approach. The result of calculation shows that SGD accounts for 47 mm year-1, corresponding to 3.6 % of the river discharge and 2.3% of the average annual rainfall. The results are in the same range as earlier reported in the research literature and thus appear reasonable. (Less)
Please use this url to cite or link to this publication:
author
Katsuki, Mamoru
supervisor
organization
year
type
H2 - Master's Degree (Two Years)
subject
keywords
hydrological model, Groundwater flow model, numerical simulation, submarine groundwater discharge, water balance analysis, Civil engineering, soil mechanics, offshore technology, hydraulic engineering, groundwater recharge, Väg- och vattenbyggnadsteknik
publication/series
TVVR08/5004
report number
08/5004
ISSN
1101-9824
language
English
id
1316602
date added to LUP
2009-01-28 00:00:00
date last changed
2019-03-27 10:33:14
@misc{1316602,
  abstract     = {{Submarine groundwater discharge (SGD) affects environmental conditions in semi-enclosed sea areas. Semi-enclosed areas often experience eutrophication caused by excess nutrient transport from agricultural areas. However, it is often unclear how much the nutrients that are transported through the groundwater discharge. Therefore, it is necessary to quantify groundwater discharge to the sea. For this quantification, a methodology to estimate SGD is presented. A distributed groundwater recharge model (GRM) and a groundwater flow model (GFM) were developed and coupled to estimate SGD from Kikuchi River basin into the Ariake Bay, Kumamoto, Kyushu, Japan. The river basin located in Kumamoto prefecture was studied as a representative area for the entire Ariake Bay catchment. The GRM separates rainfall into direct runoff, evapotranspiration, and groundwater recharge. Parameters are set based on land use. Groundwater level was calculated by the GFM to estimate subsurface water runoff, base flow to the river, and evaporation from the shallow groundwater table. The SGD was calculated using a water balance approach. The result of calculation shows that SGD accounts for 47 mm year-1, corresponding to 3.6 % of the river discharge and 2.3% of the average annual rainfall. The results are in the same range as earlier reported in the research literature and thus appear reasonable.}},
  author       = {{Katsuki, Mamoru}},
  issn         = {{1101-9824}},
  language     = {{eng}},
  note         = {{Student Paper}},
  series       = {{TVVR08/5004}},
  title        = {{Submarine Groundwater Discharge Estimation from Kikuchi River Basin to the Ariake Bay, Japan}},
  year         = {{2008}},
}