Evaluation of entrainment velocity induced by wind stress in a two-layer system

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    • Maruya Yasuyuki
    • Graduate School of Civil Engineering, Kitami Institute of Technology
    • Nakayama Keisuke
    • Department of Civil and Environmental Engineering, Kitami Institute of Technology
    • Shintani Tetsuya
    • Department of Civil and Environmental Engineering, Tokyo Metropolitan University
    • Yonemoto Mitsuaki
    • Abashiri Development and Construction Department, Hokkaido Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism


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.<br>


  • Hydrological Research Letters

    Hydrological Research Letters (4), 70-74, 2010

    Japan Society of Hydrology and Water Resources (JSHWR) / Japanese Association of Groundwater Hydrology (JAGH) / Japanese Association of Hydrological Sciences (JAHS) / Japanese Society of Physical Hydrology (JSPH)


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