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http://dx.doi.org/10.3741/JKWRA.2010.43.5.433

An Experimental Study for the Empirical Equation to Quantify the Subsidence of Riprap Scour Protection at Downstream of Vertical Drop Structures  

Kim, Chang-Sung (River, Coastal and Harbor Research Division, Korea Institute of Construction Technology)
Kang, Joon-Gu (River, Coastal and Harbor Research Division, KICT)
Yeo, Hong-Koo (River, Coastal and Harbor Research Division, KICT)
Yeo, Woon-Kwang (Dept. of Civil and Environmental Eng., Myongji Univ.)
Publication Information
Journal of Korea Water Resources Association / v.43, no.5, 2010 , pp. 433-443 More about this Journal
Abstract
Drop structures that span the entire width of channels are installed to alleviate channel grades and have been constructed widely in Korean rivers. Aprons are normally installed and integrated with drop structures and bed protections are added on the downstream part of aprons to protect both drop structures and aprons. Scour occurring on aprons is reported to provide various habitats such as ripples and pools in natural rivers. This study focuses on the scour characteristics on an apron integrated with a drop structure and the subsidence of a riprap protection. The scour depth on the downstream part of the drop structure is found to increase with the increase of unit discharge; however, to decrease as the tail water depth gets deeper. Based on the experimental measurements, the subsidence of the riprap scour protection is calculated with respect to the thickness of riprap. Finally, the dimensionless empirical equation to quantify the subsidence of the riprap scour protection without filters at downstream of the vertical drop is suggested.
Keywords
drop structure; scour depth; riprap protection; riprap subsidence equation;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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