Longitudinal and lateral circulation and tidal impacts in salt-plug estuaries
نویسندگان
چکیده
This study presents a comparison of forcings between density gradient and tides in idealized funnel-shaped salt-plug estuaries. Three-dimensional numerical model results also examine longitudinal lateral circulations. In estuaries, positive estuarine circulation is observed landward salinity maximum zone or salt plug. Seaward the plug, estuary shows an inverse cell. The flows show fortnightly variability inside Also, plug saltier spring than neap tidal cycles mainly owing to higher transport by advection during tides. divergence dv/dy have influence Coriolis acceleration. absence Earth’s rotation, tidally averaged circulations nearly same directions within cells. Directions flow reverse area. Inside this area, clear neap–spring variability, including downwelling cells upwelling exhibits vertically homogeneous condition particularly meso-tidal Finally, introduces threshold “ log(tidal Froude number)=3 ” (tidal forcing 3 orders magnitude ≥ gradients) for estuaries as under which can overcome gradient, consequently reinforced with movement. robust identified high Ekman number ( log(Ekman number)>0.25 ).
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ژورنال
عنوان ژورنال: Frontiers in Marine Science
سال: 2023
ISSN: ['2296-7745']
DOI: https://doi.org/10.3389/fmars.2023.1152625