Estimation of groundwater discharge to the sea using a distributed recharge model

M. Katsuki, J. Yasumoto, A. Tsutsumi, Yoshinari Hiroshiro, K. Jinno

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

2 Citations (Scopus)

Abstract

Groundwater discharge to sea areas affects environmental conditions along coasts. Enclosed bays may experience eutrophication caused by nutrient input from land areas through groundwater discharge since groundwater is often contaminated by large amounts of nutrients as compared with river water. Therefore, it is necessary to estimate the groundwater discharge into seas quantitatively in order to understand nutrient pathways. A distributed groundwater recharge model was developed in order to estimate total groundwater discharge flow into the Ariake Bay, in Kyushu, Japan. The Komoda catchment within the Kikuchi River basin in Kumamoto prefecture was studied as a representative area for the Ariake Bay. The model partitions rainfall into direct runoff, evapotranspiration, and groundwater recharge. Parameters are set based on land use. Groundwater discharge is calculated using a water balance approach. The results show that groundwater discharge into the Ariake Bay from Kukuchi River basin is on average 123 mm year-1. The groundwater discharge accounts for about 8% of total water discharge and 9% of river discharge. The results can be used to better estimate annual transport of nutrients in the groundwater to the sea and thus also to better manage eutrophication problems.

Original languageEnglish
Title of host publicationFrom Headwaters to the Ocean: Hydrological Changes and Watershed Management - Proc. of the International Conference on Hydrological Changes and Management from Headwaters to the Ocean, HYDROCHAN 2008
Pages625-630
Number of pages6
Publication statusPublished - 2009
EventInternational Conference on Hydrological Changes and Management from Headwaters to the Ocean, HYDROCHANGE 2008 - Kyoto, Japan
Duration: Oct 1 2008Oct 3 2008

Other

OtherInternational Conference on Hydrological Changes and Management from Headwaters to the Ocean, HYDROCHANGE 2008
CountryJapan
CityKyoto
Period10/1/0810/3/08

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Ocean Engineering
  • Water Science and Technology

Fingerprint Dive into the research topics of 'Estimation of groundwater discharge to the sea using a distributed recharge model'. Together they form a unique fingerprint.

  • Cite this

    Katsuki, M., Yasumoto, J., Tsutsumi, A., Hiroshiro, Y., & Jinno, K. (2009). Estimation of groundwater discharge to the sea using a distributed recharge model. In From Headwaters to the Ocean: Hydrological Changes and Watershed Management - Proc. of the International Conference on Hydrological Changes and Management from Headwaters to the Ocean, HYDROCHAN 2008 (pp. 625-630)