Kp. Black et Ma. Rosenberg, SUSPENDED SAND MEASUREMENTS IN A TURBULENT ENVIRONMENT - FIELD COMPARISON OF OPTICAL AND PUMP SAMPLING TECHNIQUES, Coastal engineering, 24(1-2), 1994, pp. 137-150
Suspended sediment concentrations in and around the surf zone measured
from pumped samples were compared to measurements from an optical bac
kscatterance (OBS) sensor. At higher values of the eddy diffusivity an
d sediment grain size under breaking waves, the pump trapping efficien
cy was increased by up to 2.1 times, possibly due to turbulent diffusi
on or convection of suspended sediment particles in directions paralle
l to the pump inlet. Offshore of the break point, the pump undersample
d the suspended sediment in accordance with prior laboratory tests in
uni-directional flows. The response of OBS sensors is dependent on the
grain size in suspension, and a correction formula for grain size eff
ects was obtained.