Study on Initial Stage of Diffusion Process of Turbidity in Direct Dumping of Soil

Tamai, Masahiro; Muraoka, Kohji; Murota, Akira; Machida, Hideo

doi:10.2208/jscej.1995.515_77

Cited by 5 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The accurate prediction of settling processes of disposed material in open waters, such as descending, transport and dispersion of the material, is of practical importance for both engineering management and environmental protection. A few experimental studies on particle thermals were performed by Murota et al [19], Nakatsuji et al [20], Tamai et al [21] and B uhler and Papantoniou [22]. Nakatsuji et al [20] found that the dynamic behaviour of a sand cloud is close to the heavy thermal motion and the plane particle clouds approached a constant frontal velocity in their ÿnal stage.…”

Section: Background Of Sediment Dumpingmentioning

confidence: 99%

Numerical modelling of 3D stratified free surface flows: a case study of sediment dumping

Lin

Wang

2006

Int. J. Numer. Meth. Fluids

View full text Add to dashboard Cite

SUMMARYA three-dimensional numerical model has been developed to simulate stratiÿed ows with free surfaces. The model is based on the Reynolds-averaged Navier-Stokes (RANS) equations with variable uid density. The equations are solved in a transformed -coordinate system with the use of operatorsplitting method (Int. J. Numer. Meth. Fluids 2002; 38:1045 -1068). The numerical model is validated against the one-dimensional di usion problem and the two-dimensional density-gradient ow. Excellent agreements are obtained between numerical results and analytical solutions. The model is then used to study transport phenomena of dumped sediments into a water body, which has been modelled as a strongly stratiÿed ow. For the two-dimensional problem, the numerical results compare well with experimental data in terms of mean particle falling velocity and spreading rate of the sediment cloud for both coarse and medium-size sediments. The model is also employed to study the dumping of sediments in a three-dimensional environment with the presence of free surface. It is found that during the descending process an annulus-like cloud is formed for ÿne sediments whereas a plate-like cloud for medium-size sediments. The model is proven to be a good tool to simulate strongly stratiÿed free surface ows.

show abstract

Section: Background Of Sediment Dumpingmentioning

confidence: 99%

Numerical modelling of 3D stratified free surface flows: a case study of sediment dumping

Lin

Wang

2006

Int. J. Numer. Meth. Fluids

View full text Add to dashboard Cite

show abstract

“…BWDB 1997). Artificial islands are also created by sand dumping in marine environment (Shields et al 1984, Tamai et al 1991. During building up of sediment mounds, material is continuously fed into the water from barges.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of mounds formed by dumping coarse sediment in channel flow

Bhuiyan

Rajaratnam

Zhu

2010

Journal of Hydraulic Research

View full text Add to dashboard Cite

The development of large sediment mounds formed by continuous release of coarse materials in flowing water is reported. Growths of mound height, longitudinal profile and areal extent were examined for three flow conditions. Longitudinal profiles of depositions during the development phase of the mounds were approximately similar, and they can be expressed by an exponential function if scaled with the maximum height and a width parameter. From observations, it appeared that the mound peak shifted gradually towards upstream and followed the outer part of the sediment plume. The heap growth can be expressed as a function of buoyancy flux due to sediment disposal, flow momentum and densimetric particle Froude number. The deposition height increased with normalized time until reaching close to the water surface. The width and area developed faster with normalized time than the height. The deposition area with coarse sediment was characterized by a downstream tail and fin-like extensions on the sides which differed from observations in previous experiments with fine sand.

show abstract

The dispersion characteristics of sand under water

Yamamoto¹,

Masaaki²,

Maeno³

2004

Environmental Hydraulics and Sustainable Water Management, Two Volume Set

View full text Add to dashboard Cite

Study on Initial Stage of Diffusion Process of Turbidity in Direct Dumping of Soil

Cited by 5 publications

References 5 publications

Numerical modelling of 3D stratified free surface flows: a case study of sediment dumping

Numerical modelling of 3D stratified free surface flows: a case study of sediment dumping

An experimental study of mounds formed by dumping coarse sediment in channel flow

The dispersion characteristics of sand under water

Contact Info

Product

Resources

About