2. Characteristics and Motion of Sédiments
37
Problem II
What shear stress will move a 2.0 cm particle resting on the seabed?
Solution
From the graph shown in Fig. 2.5, for the given grain size particle (read
from horizontal axis), the line intersecting the curve corresponds to the
shield’s parameter (read from vertical axis).
Shields parameter = 0.05
{pa -rfgD = °-05
Tcr = 0.05 x (2650 - 1025) x 9.81 x 0.02
rcr = 15.94 Nm-2
The shear stress of 15.94Nm-2 will initiate the movement of a particle
of diameter 2.0 cm.
References
ASTM D4318-17, Standard Test Methods for Liquid Limit, Plastic Lirait, and
Plasticity Index of Soils, ASTM International, West Conshohocken, PA, 2017.
Edgers, L. and Karlsrud, K. (1982). Soil flow generated by submarine slides —
Case studies and conséquences, Proc. 3rd Int. Conf. Behaviours of Offshore
Structures, pp. 425-437.
Pair, G. M. and Hatch, L. P. (1933). Fondamental factors governing the streamline
flow of water through sand, J. Amer. Water Works Assoc., 25, 1151-1565.
Hallermeier, R. J. (1980). Sand motion initiation by water waves: Two asymptotes, Journal of Waterway, Port, Coastal and Océan Engineering, 106, No. 3,
299-318.
Richardson, J. F. and Jeronimo, M. A. D. (1979). Velocity-voidage relations for
sédimentation and fluidization, Chem. Eng. Sci., 34, 1419-1422.
Shields, A. (1936). Anwendung der Aehnlichkeitsmechanik und der Turbulenzforschung auf die Geschiebebewegung, Mitt. Preuss. Versuchsanst. Wasserbau Schiffbau, 26, 36 pp.
37
Problem II
What shear stress will move a 2.0 cm particle resting on the seabed?
Solution
From the graph shown in Fig. 2.5, for the given grain size particle (read
from horizontal axis), the line intersecting the curve corresponds to the
shield’s parameter (read from vertical axis).
Shields parameter = 0.05
{pa -rfgD = °-05
Tcr = 0.05 x (2650 - 1025) x 9.81 x 0.02
rcr = 15.94 Nm-2
The shear stress of 15.94Nm-2 will initiate the movement of a particle
of diameter 2.0 cm.
References
ASTM D4318-17, Standard Test Methods for Liquid Limit, Plastic Lirait, and
Plasticity Index of Soils, ASTM International, West Conshohocken, PA, 2017.
Edgers, L. and Karlsrud, K. (1982). Soil flow generated by submarine slides —
Case studies and conséquences, Proc. 3rd Int. Conf. Behaviours of Offshore
Structures, pp. 425-437.
Pair, G. M. and Hatch, L. P. (1933). Fondamental factors governing the streamline
flow of water through sand, J. Amer. Water Works Assoc., 25, 1151-1565.
Hallermeier, R. J. (1980). Sand motion initiation by water waves: Two asymptotes, Journal of Waterway, Port, Coastal and Océan Engineering, 106, No. 3,
299-318.
Richardson, J. F. and Jeronimo, M. A. D. (1979). Velocity-voidage relations for
sédimentation and fluidization, Chem. Eng. Sci., 34, 1419-1422.
Shields, A. (1936). Anwendung der Aehnlichkeitsmechanik und der Turbulenzforschung auf die Geschiebebewegung, Mitt. Preuss. Versuchsanst. Wasserbau Schiffbau, 26, 36 pp.