An Investigation Of The Depositional Properties Of Flocculated Fine Sediments

Cohesive Sediment Flocculation and the Application to Settling Flux Modelling

“…Optical devices to measure concentration profiles by Spinrad et al (1989), Kineke et al (1989), andGross (1991) have sought to quantify the rate of water clearance, www.intechopen.com but they are unable, like all earlier instrumentation, to measure particle size and settling velocity spectra directly. Whereas sampling devices which directly observe D and Ws can provide an insight into the interaction of flocs with both turbulent eddies and SPM concentration variations during a tidal cycle, particularly within the lower layers of the flow where the turbulent shearing is at its greatest (Mehta and Partheniades, 1975). Deploying floc samplers in conjunction with high frequency velocimeters provides scientists a means of accurately acquiring time series of both the spectral distribution of the floc dry mass and settling velocities, together with information on the turbulence fluctuations, directly from within a turbulent estuarine water column.…”

Three- Dimensional Numerical Simulation of Cohesive Sediment Transport in Natural Lakes

“…Based on Krone (1962) and Mehta and Partheniades (1975), the deposition rate (D b ) can be calculated by:…”

“…www.intechopen.com (Lou et al 2000;Hamilton and Mitchell 1996;Ziegler and Nisbet 1995;Mehta and Partheniades 1975). Since these two critical stresses were not measured in Deep Hollow Lake, sensitivity analyses were conducted to determine the values of critical shear stresses for erosion and deposition (τ ce , τ cd ).…”

“…Thorn (1981), Ziegler and Nisbet (1995), Li and Mehta (1998) established several empirical formulas for settling velocity of flocs by considering the effects of sediment size, sediment concentration, salinity, turbulence intensity, and bed shear stress. Krone (1962) and Mehta and Partheniades (1975) investigated deposition of cohesive sediment and proposed formulas to estimate deposition rates. Partheniades (1965) proposed a formula to calculate the erosion rate of cohesive sediment.…”

Investigating Suspended-Sediment Transport in a Shallow Lake Using a Three-Dimensional Model

“…The dynamic processes involved in suspended-sediment transport such as flocculation, deposition, and erosion (resuspension) have been studied by many scientists [8][9][10][11][12][13][14][15][16]. A number of laboratory studies have improved our knowledge of t he resuspension behavior of fine-grained material.…”