Flow Characteristic Variations on Groyne Types for Aquatic Habitats

Joongu Kang, Hongkoo Yeo, Sanghwa Jung

Department of Water Resource Research, Korea Institute of Construction Technology, Ilsan, Korea.

DOI: 10.4236/eng.2012.411103                

Abstract

The field formed by groyne has the function of aquatic habitats for the underwater biology. The characteristic of groyne field occurring around downstream of groyne depends on groyne type and shape. Thus to maximize the function of groyne, it needs to understand the flow characteristic around groyne. In this study, experiment model test was conducted in recirculation zone located in downstream of groyne. Groyne types for experiment are three: permeable, impermeable and inclined crest groyne. LSPIV (Large Scale Particle Image Velocimetry) is used to measure flow field around the groyne and it revealed flow characteristic in recirculation zone at each case. In order to estimate the aquatic habitats of groyne fields, critical swimming speed of major fleshwater fish in Korea was compared with the variation of velocity distribution in groyne fields. From the results, the rate of velocity decreases in groyne fields, V/Vapp were measured to be 0 to 0.5 and the results can be fundamental data which are used to estimate the aquatic habitable function of groyne.

Keywords

Groyne; Recirculation Area; Aquatic Habitats; Critical Swimming Speed

Conflicts of Interest

The authors declare no conflicts of interest.

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