BOTTOM BOUNDARY SHEAR STRESSES ON A MODEL BEACH

Near-bottom shear stresses in a small, highly stratified estuary

[1] This paper examines near-bottom shear stresses at two locations in a small, highly stratified estuary: the Navesink River, New Jersey, USA. The shear stresses obtained from acoustic Doppler current profilers (ADCPs) operating in the recently developed mode 11 at a high spatial resolution are examined in detail. Measurement noise of the ADCP is estimated using autocorrelation analyses and is...

Shear-induced convective mixing in bottom boundary layers on slopes

Field data from a stratified lake demonstrate that buoyancy-driven convective mixing can be an important mechanism for the formation of well-mixed bottom boundary layers (BBLs) on slopes. Convective turbulence is caused by differential transport of stratified water masses along the slope of a basin. Because the current velocity usually decreases toward the sediment, water at some distance from ...

The effect of waves on subgrid-scale stresses, dissipation and model coefficients in the coastal ocean bottom boundary layer

Boundary Shear Stress in a Trapezoidal Channel

This paper focuses on a hydraulic radius separation approach used to calculate the boundary shear stress in terms of bed and wall shear stress proposed in a trapezoidal channel. The average bed and sidewall shear stress in smooth trapezoidal open channels are derived after using Guo & Julien (2005) early equations taking a part of an investigation to cover both rectangular and trapezoidal chann...

Direct Measurements of Reynolds Stresses and Turbulence in the Bottom Boundary Layer

b. Quantify the temporal variation of turbulent stresses, turbulence production, dissipation and spectra in relation to the oceanographic parameters that represent the local environment, such as waves, currents, vertical density gradient, internal waves and the nature of the water-sediment interface. The conclusions will quantify the relative importance of different mechanisms that control the ...