Matter dispersion process in tidal inlets

Yasuda Hidekazu

doi:10.5928/kaiyou.24.1_1

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Other Title

内湾域における物質分散過程
内湾域における物質分散過程 : 混合拡散代表時間の意義とEkman吹送流や潮汐残差流による物質分散
ナイワンイキニオケルブッシツブンサンカテイ : コンゴウカクサンダイヒョウジカンノイギト Ekman スイソウリュウヤチョウセキザンサリュウニヨルブッシツブンサン
混合拡散代表時間の意義とEkman吹送流や潮汐残差流による物質分散
Significance of the characteristic mixing time and matter dispersion due to Ekman drift currents and a tide-induced residual circulation

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<p>Shear diffusion drew attract of many hydraulic researchers at the beginning as longitudinal dispersion of passive matter in a narrow pipe or tube, which has been regarded as the third mixing dilution process sequent to molecular and turbulent diffusions. Although the idea was applied by some researchers to the environmental flow like estuaries and tidal inlets with taking no notice of the severe conditions, the present report takes up a problem of analysis of usual longitudinal dispersion and investigates possibility of practical application of shear diffusion to natural environmental flows. Based on the model that suspended matter near the basin floor is effectively dispersed in an oscillatory current with the Stokes layer, horizontal dispersion due to the wind of particles distributed near the water surface is analyzed assuming the transient Ekman drift current. The dispersion coefficient induced by the wind might become relatively large even at the initial stage because of the substantially short characteristic mixing time in the Ekman layer. The process causing the one dimensional diffusion (longitudinal dispersion) coefficient of the Seto Inland Sea is revealed using the idea of the substantial characteristic mixing time.</p>

Journal

Oceanography in Japan

Oceanography in Japan 24 (1), 1-28, 2015-01-15

The Oceanographic Society of Japan

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