A REASSESSMENT OF THE ROLE OF TIDAL DISPERSION IN ESTUARIES AND BAYS

被引:133
作者
GEYER, WR [1 ]
SIGNELL, RP [1 ]
机构
[1] US GEOL SURVEY,WOODS HOLE,MA 02543
来源
ESTUARIES | 1992年 / 15卷 / 02期
关键词
D O I
10.2307/1352684
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The role of tidal dispersion is reassessed, based on a consideration of the relevant physical mechanisms, particularly those elucidated by numerical simulations of tide-induced dispersion. It appears that the principal influence of tidal currents on dispersion occurs at length scales of the tidal excursion and smaller; thus the effectiveness of tidal dispersion depends on the relative scale of the tidal excursion to the spacing between major bathymetric and shoreline features. In estuaries where the typical spacing of topographic features is less than the tidal excursion, tidal dispersion may contribute significantly to the overall flushing. In estuaries and embayments in which the typical spacing between major features is larger than the tidal excursion, the influence of tidal dispersion will be localized, and it will not markedly contribute to overall flushing. Tidal dispersion is most pronounced in regions of abrupt topographic changes such as headlands and inlets, where flow separation occurs. The strong strain rate in the region of flow separation tends to stretch patches of fluid into long filaments, which are subsequently rolled up and distorted by the transient eddy field. The dispersion process accomplished by the tides varies strongly as a function of position and tidal phase and thus does not lend itself to parameterization by an eddy diffusion coefficient.
引用
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页码:97 / 108
页数:12
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