Yasuyuki Maruya, Keisuke Nakayama, Tetsuya Shintani and Mitsuaki Yonemoto
Release Date: August 31, 2010

Evaluation of entrainment velocity induced by wind stress in a two-layer system
Yasuyuki Maruya1), Keisuke Nakayama2), Tetsuya Shintani3) and Mitsuaki Yonemoto4)

1) Graduate School of Civil Engineering, Kitami Institute of Technology
2) Department of Civil and Environmental Engineering, Kitami Institute of Technology
3) Department of Civil and Environmental Engineering, Tokyo Metropolitan University
4) Abashiri Development and Construction Department, Hokkaido Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism

(Received: June 14, 2010)
(Accepted for publication: August 5, 2010)

Abstract:
This study aims to reveal the factors most useful for evaluating the influence of wind on entrainment from the lower to upper layer in a two-layer system. Lake Abashiri, which is a typical brackish lake, is chosen as a study area because a distinct two-layer system exists due to salt-wedge intrusion from the ocean. To evaluate entrainment velocity between two layers, a 3D numerical computation is applied, showing good agreement with field observations. Computations suggest that the entrainment velocity estimated using the Richardson number is smaller than that from field observations. Thus, other factors are computed suggesting that use of the Lake number is more effective in estimating entrainment velocity due to internal wave breaking and interfacial fluctuation than use of the Effective Wedderburn number.

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To cite this article:
Yasuyuki Maruya, Keisuke Nakayama, Tetsuya Shintani and Mitsuaki Yonemoto: “Evaluation of entrainment velocity induced by wind stress in a two-layer system”, Hydrological Research Letters, Vol. 4, pp.70-74, (2010) .

doi:10.3178/hrl.4.70
JOI JST.JSTAGE/hrl/4.70
Copyright (c) 2010 Japan Society of Hydrology and Water Resources