Abstract
The local scouring that occurs around submerged vertical piles in steady currents was studied experimentally in this paper. Three experiments were carried out for square cross-section (SC) piles and a circular cross-section (CC) pile with the same width. The key point scour depths, including the center of the upstream boundary point (KC) and the two upstream corners (KM), were observed over time. The two-dimensional profiles and the three-dimensional topography around each pile were measured using a Seatek. The different scouring characteristics of the SC and CC piles were investigated. The experiment results show that the scour depth at KC is much smaller than that of KM. The equilibrium scour depth of the CC pile is far less than that of the SC piles. The scour and deposition distributions were different between the CC and SC piles. The maximum scour depth was found at the lateral rear of the CC pile, and the maximum deposition was observed in sections of the SC piles. The evolutions of the scour depths at KM are predicted using a developed exponential equation.
Highlights
Local scouring is a morphodynamic process generated by the presence of the obstacles in currents, waves, or currents plus waves
Experimental tests of local scouring around the submerged vertical SC and CC piles under deposition close to the lateral sides of the pile was lower
All tests were conducted under clear-water scour conditions with a found at the scour pits downstream of the CC pile (Figure 9c)
Summary
Local scouring is a morphodynamic process generated by the presence of the obstacles in currents, waves, or currents plus waves As it is an interdisciplinary subject, research studies are usually based on the theories of hydraulic and sediments transport in literature, such as [1,2,3,4,5]. Dey et al [14] conducted a series of experiments to study the influences of circular cross-section (CC) pile submergence on the scour depth under clear-water scour conditions. They stated that the horseshoe vortex circulations and scour depth decrease with an increase in submergence. When the pile height-to-width ratio hc /D exceeds 2, Water 2019, 11, 1820; doi:10.3390/w11091820 www.mdpi.com/journal/water
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