TIME-SCALES OF WIND-INDUCED MIXING PROCESSES ASSOCIATED WITH THE TOPOGRAPHY AND STRATIFICATION
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- ASAOKA Daiki
- 茨城大学大学院理工学研究科都市システム工学専攻
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- MASUNAGA Eiji
- 茨城大学 広域水圏環境科学教育研究センター
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- KOMURO Shunsuke
- 茨城県県民生活環境部生活文化課
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- KITAMURA Tatsumi
- 茨城県霞ケ浦環境科学センター
Bibliographic Information
- Other Title
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- 地形と成層の変化に関連する風応力による混合応答時間の評価
- チケイ ト セイソウ ノ ヘンカ ニ カンレン スル カゼオウリョク ニ ヨル コンゴウ オウトウ ジカン ノ ヒョウカ
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Abstract
<p> This study investigated time-scales associated with mixing in inner parts of bay, lakes and reservoirs using a two dimensional (x-z) numerical simulator, SUNTANS. Several conditions of the horizontal scale of calculation area, stratification and wind speed were used for simulations with 𝑊e ranging 0.1-10. This study employees teo time-scales: (1) time-scale required for a steady state temperature distribution estimated from the slope of the thermocline, 𝑇s, and (2) time-scale required for complete vertical mixing, 𝑇mix. 𝑇mix is computed from change in the potential energy. A quarter of the internal seiche period was shorter than 𝑇s and 𝑇mix excepting highly nonliner cases. This implies that the lower limit of the mixing time-scale is determined by a quarter of the internal seiche period for liner conditions. For highly nonlinear cases, the internal Froude number was higher than unity. The distribution of the Richardson number showed that the vertical mixing expands from the leeward toward the windward.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 76 (2), I_145-I_150, 2020
Japan Society of Civil Engineers