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http://dx.doi.org/10.3741/JKWRA.2005.38.2.143

An Experimental Study on Tip Velocity and Downstream Recirculation Zone of Single Groyne Conditions  

Kang, Joon-Gu (한국건설기술연구원 수자원연구부)
Yeo, Hong-Koo (한국건설기술연구원 수자원연구부)
Kim, Sung-Jung (한국건설기술연구원 수자원연구부)
Publication Information
Journal of Korea Water Resources Association / v.38, no.2, 2005 , pp. 143-153 More about this Journal
Abstract
Recently, the concern of groynes that provide us with various ecological environment and improvement of scenary near river as well as hydraulic improvement has greatly increased for naturalized river and ecological river restoration. However there is no adequate design guidelines in Korea. Furthermore there is lack of research for installation of groynes in Korea. Thus, in this study, we have conducted hydraulic modeling test for kinds of groyne and changes of permeability and made a study of the analysis for installation factor of groyne. Experimental conditions were the fixed bed model for flow pattern of groyne tip and separation length about changes of groyne length and permeability. The Experiments were conducted to measure velocity and drift angle at groyne tip. The main study kas measured the groyne tip velocity for a factor of scour and drift angle for velocity increase at center of channel. We have suggested the equation about groyne tip velocity rate(tip velocity/ approach velocity) and area rate(groyne area/ flow area). And In recirculation zone of groyne downstream, To study the basic data of groyne about installation interval has analyzed the change of separation length and incidence angle. We have suggested the equation about separation length rate(separation length/ groyne length), changes of permeability and installation angle.
Keywords
groyne; recirculation zone; separation length; tip velocity;
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