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

Kang, Jiwoo; Yeo, Hongkoo; Kim, Sung-Jung

doi:10.3741/jkwra.2005.38.2.143

Cited by 11 publications

(6 citation statements)

References 5 publications

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“…The width of recirculation field decreases as the increase of the water level and the width of board type was larger than inclined crest groyne, which was about 30% -100% as shown in Figure 9. As applying conversion permeability based on permeability of general groyne, P tr , result of the study is well agreed with previous research result by [4] as shown in Figure 10. In Figures 11 and 12, length of recirculation field decreases as water level increases and the length of board type is longer than inclined crest groyne, which is about from 45% up to 110%.…”

Section: Flow Characteristic Of Inclined Crest Groyne In Recirculatiosupporting

confidence: 81%

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Flow Characteristic Variations on Groyne Types for Aquatic Habitats

Kang¹,

Yeo²,

Jung³

2012

ENG

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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/V app 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.

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Section: Flow Characteristic Of Inclined Crest Groyne In Recirculatiosupporting

confidence: 81%

“…The length of recirculation zone, S L for impermeable groyne represented in 12 times of groyne length. In the case of permeable groyne, as the increase of permeability and S L was decreased [4].…”

Section: Flow Characteristic In Recirculation Zone Of Permeable and Imentioning

confidence: 99%

Flow Characteristic Variations on Groyne Types for Aquatic Habitats

Kang¹,

Yeo²,

Jung³

2012

ENG

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“…In Korea, study data related to groynes are very insufficient. Kang, et al [6] proposed an experimental formula on the recirculation zone at the downstream area through experiments on the recirculation zone at downstream groynes on the groyne line end's velocity penetration rate, approaching velocity, and groyne length as the major elements of maximum scour. Yeo, et al [7] presented the separation zone and thalweg line on the I-type, nonpenetrated groyne and carried out an experimental study on the main flow variations but did not deal with various types of groynes.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Flow Characteristics of ￢-Type Groyne

Junsang¹,

Yeo²

2011

ENG

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A hydraulic model test for ㄱ-type groynes (with "ㄱ" shape) was conducted to analyze the flow characteristics around these groynes. The results of the model tests are expected to be used as fundamental information in designing the ㄱ-type groyne constructed in the field. Main hydraulic factors such as velocity and thalweg line changes in the main channel and separation area were analyzed in this study. The thalweg line is a stream line where the maximum velocity occurs, whereas the separation area is the boundary between the main flow and the recirculation zone. Model tests with 5 different arm lengths of the ㄱ-type groynes were conducted by changing the velocity. The LSPIV (Large-Scale Particle Image Velocimetry) technique was used to measure and analyze flow variation around the ㄱ-type groynes. The velocity in the main channel measured to be increased by 1.5 times. The velocity variation on groyne arm length is little. The width of the thalweg lines (T CL) was changed to 55%-57% of the channel width. The Froude number did not affect the thalweg line (T CL) and separation line (S h) changes, however.

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“…The A/D Chip maintains a 5 volt electrical pressure, and the electrical pressure changes in the standard 5 volts caused by the analog signals converts the analog signals into digital signals. It is critical for the A/D Chip to maintain an accurate and a continuous 5 volts [2]. The majority of the latest A/D Chips employ multiplexers that can handle multiple sensor inputs.…”

Section: Data Acquisition Systemmentioning

confidence: 99%

“…The signals from the sensors come in a form of a continuous analog signal, caused by the resistance in the electrical pressure [1,2]. In most cases, these signals become unreliable due to the static and the weakness of the signal as it becomes digitally converted through an elec-trical circuit in its final phase.This process is called "Signal Conditioning" [3].…”

Section: Data Acquisition Systemmentioning

confidence: 99%

Development and Application of Real-time Bridge Scour Monitoring System

Kang¹

2011

ENG

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Because of the complex nature of the changes in the current and movement of the riverbeds by bridge scouring, it is impossible to understand or predict these changes. In order to have a reliable data, it is critical to have the current methods and equipment for measuring bridge scouring replaced with technology that could acquire real-time bridge scouring data. Despite the critical need for real-time data acquisition, the harsh environmental conditions have prevented the scientific community from acquiring real-time data. Harsh environmental conditions were addressed by the developmental of an automated, remote data collection system, allowing real-time data such as scour movement, scour depth, and scour trend to be viewed in a safe location. As a result, accurate sea-floor movements were seen for the first time, aiding the direction and future of bridge scour research, ultimately contributing greatly to the safety of bridges.

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

Cited by 11 publications

References 5 publications

Flow Characteristic Variations on Groyne Types for Aquatic Habitats

Flow Characteristic Variations on Groyne Types for Aquatic Habitats

Experimental Study on the Flow Characteristics of ￢-Type Groyne

Development and Application of Real-time Bridge Scour Monitoring System

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