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A Fundamental Study on the Influences of Submarine Groundwater Discharge on Coastal Water Environment

[+] Author Affiliations
Shigeru Tabeta

University of Tokyo, Kashiwa, Chiba, Japan

Tsuguki Kinoshita

National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan

Paper No. OMAE2008-57812, pp. 829-835; 7 pages
doi:10.1115/OMAE2008-57812
From:
  • ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 3: Pipeline and Riser Technology; Ocean Space Utilization
  • Estoril, Portugal, June 15–20, 2008
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4820-3 | eISBN: 0-7918-3821-8
  • Copyright © 2008 by ASME

abstract

It has been considered that most of the terrestrial water and contained substances are supplied into the ocean through the rivers. However, recent studies show that the submarine ground-water discharge (SGD) is also significant as the route of water and substances from the land to the ocean. In order to evaluate the influences of SGD on the coastal water environment, it is important to investigate the amount of SGD flux into the sea as well as the behaviour of discharged water and substances in the coastal sea. In the present study, the total SGD flux is estimated by the budget analysis of the target sea area, in which a parameter for water exchange between the coastal sea and the ocean is calculated by means of a numerical simulation by a hydro-dynamic model and a dynamic budget model. The behaviour of discharged groundwater is also investigated by hydraulic experiments and numerical simulations using non-hydrostatic model. It is found that the early-stage behaviour of the discharged submarine groundwater as buoyant plume could be categorized into three types due to the ratio of discharge velocity to the background horizontal current velocity.

Copyright © 2008 by ASME

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