||Effects of Planform Geometry on Tidal Flushing and Mixing in Marinas.
Nece, R. E. ;
Richey, E. P. ;
Rhee, J. ;
Smith, H. N. ;
||Washington Univ., Seattle. Dept. of Civil Engineering.;Corvallis Environmental Research Lab., OR.
Hydraulic models ;
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Physical hydraulic models of marinas possessing rectangular planforms were tested to determine effects of various geometrical parameters on tidal flushing and internal circulation in small harbors. Parameters investigated were: (1) Planform geometry aspect ratio; (2) ratio of entrance cross-sectional area to basin planform area; (3) effect of rounding of corners in the basin interior; (4) orientation and location of a single entrance; (5) effect of two entrances versus a single entrance. It is concluded that for rectangular planform basins, optimum exchange is achieved when the basin length to width (aspect) ratio lies between 0.5 and 2.0, the interior corners are rounded and the single entrance centrally located on the seaward side of the harbor. Rounding has little effect on average flushing but does increase the uniformity of local exchange throughout the basin. Results were obtained through a photographic technique incorporating the use of a photodensitometer.