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.
Highlights
Groyne is the structure that is constructed in bank or foresight of riverside and has the function such as bank protection, flow control and water depth control of main stream
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
Flow around groyne is divided into two fields; Groyne field occurring recirculation zone by flow separation and main field occurring flow change by protrusion of groyne
Summary
Groyne is the structure that is constructed in bank or foresight of riverside and has the function such as bank protection, flow control and water depth control of main stream. The installation purpose of groyne is spread to habitable place for underwater biology and fishes as raising a role of environmental function in recirculation zone. Flow around groyne is divided into two fields; Groyne field occurring recirculation zone by flow separation and main field occurring flow change by protrusion of groyne. Flow velocity in recirculation zone is low and various comparing to main stream so that recirculation zone can be used to aquatic habitats. The recirculation zone can be defined as recirculation length, SL and width, Sh. SL means the maximum downstream length from installation point of groyne and Sh is maximum width. Size of recirculation zone can be defined through SL and Sh
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