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Water and heat budgets in a coastal lagoon controlled by groundwater outflow to the ocean

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Title: Water and heat budgets in a coastal lagoon controlled by groundwater outflow to the ocean
Authors: Chikita, Kazuhisa A. Browse this author →KAKEN DB
Uyehara, Hiroyuki Browse this author
Al Mamun, Abdullah Browse this author
Umgiesser, Georg Browse this author
Iwasaka, Wataru Browse this author
Hossain, Md Motaleb Browse this author
Sakata, Yoshitaka Browse this author
Keywords: Oikamanai Lagoon
Water budget
Heat budget
Confined groundwater outflow
Sand bar
Issue Date: Aug-2015
Publisher: Springer
Journal Title: Limnology
Volume: 16
Issue: 3
Start Page: 149
End Page: 157
Publisher DOI: 10.1007/s10201-015-0449-4
Abstract: Oikamanai Lagoon in the Tokachi coastal region of Hokkaido, Japan, opens to the ocean several times a year due to water overflow across the sand bar triggered by rainfall or snowmelt runoffs of inflowing rivers. The water-budget calculation for the lagoon under closed conditions indicates that the net groundwater output occurs as confined groundwater, probably flowing into the ocean through the sand bar. The net groundwater output is then balanced mainly by river inflow. For the lagoon's heat budget, heat flux caused by net groundwater output was an unknown factor balanced by heat flux of river inflow and a change in the lagoon's heat storage. The two net groundwater outputs from water and heat budgets exhibit the linear relationship close to the one-to-one correspondence. Hence, two unknown factors-groundwater outflow (G (out)) and groundwater inflow (G (in))-were estimated separately. G (out) and G (in) values averaged over the budget period were estimated to be 1.04 m(3) s(-1) and 0.078 m(3) s(-1) (7.5 % of G (out)), respectively. Thus, the groundwater outflow to the ocean, representing most of the groundwater output, may control water residence time and water and material cycles related to the ecosystem in or around the lagoon.
Rights: The original publication is available at
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 知北 和久

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