Turbulence closure modeling of estuarine stratification

摘要: Transient stratification in estuaries reflects competition between the stratifying influences of vertical gravitational circulation and elastic straining longitudinal density gradient by shear, set against mixing influence of, principally, tidally generated turbulence. A one-dimensional (vertical) numerical model an estuary, using seven different parameterizations mass momentum coefficients from literature, is used to make general predictions about nature time-dependent signal estuary. These show good agreement with published simpler models they demonstrate that, at higher frequencies (e.g., first second species tides) produced primarily but lower (due fortnightly spring-neap modulation, for example) estuarine tends dominate. The same model, rotation included, then hindcast a time series Spencer Gulf, South Australia, order test real data. character semidiurnal diurnal better predicted some schemes than others. Against qualitative quantitative criteria, Mellor Yamada (1982) Pacanowski Philander (1981) perform best. All schemes, however, underpredict amplitude all timescales. At longer timescales, associated springs-neaps cycle, this believed be due difference degree geostrophic adjustment observations, three-dimensional topography observational site (Spencer Australia).