Yonguk Ryu
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View article: Assessment of Downstream Flood Safety Based on Dam Operation Strategies for Extreme Rainfall Events
Assessment of Downstream Flood Safety Based on Dam Operation Strategies for Extreme Rainfall Events Open
With the global increase in the frequency and magnitude of extreme rainfall events owing to climate change, there is a growing need to analyze how major hydraulic structures, such as dams, influence downstream flood safety through their fl…
View article: Experimental Study of Wave Overtopping Flow Behavior on Composite Breakwater
Experimental Study of Wave Overtopping Flow Behavior on Composite Breakwater Open
The safety of pedestrians on a breakwater structure or seawall is significantly influenced by two essential factors: the wave overtopping flow velocity (OFV) and the overtopping layer thickness (OLT). The main issue, however, is that most …
View article: Flow Turbulence and Pressure Fluctuations in a Hydraulic Jump
Flow Turbulence and Pressure Fluctuations in a Hydraulic Jump Open
Turbulence and pressure fluctuations are key elements in the bed protection design of hydraulic structures. However, their roles in a hydraulic jump are not yet fully understood, and the nature of their relationships are not conclusive. In…
View article: Study of Overtopping Flow Velocity and Overtopping Layer Thickness on Composite Breakwater under Regular Wave
Study of Overtopping Flow Velocity and Overtopping Layer Thickness on Composite Breakwater under Regular Wave Open
Overtopping flow velocity (OFV) and overtopping layer thickness (OTL) are essential parameters in breakwater design. Several empirical equations to predict these parameters are available in many works of literature, but most of the equatio…
View article: Numerical Study on Tide and Tidal Current along Bali Strait, Indonesia using Finite Volume Coastal Ocean Model (FVCOM)
Numerical Study on Tide and Tidal Current along Bali Strait, Indonesia using Finite Volume Coastal Ocean Model (FVCOM) Open
A numerical study was carried out in Bali Strait, Indonesia. Finite Volume Coastal Ocean Model (FVCOM) was used to simulate the seawater circulation in Bali Strait. The water circulations were forced by the four major tidal components (…
View article: Experimental Study of Vegetated Flows in the Stream-scale Natural Channel
Experimental Study of Vegetated Flows in the Stream-scale Natural Channel Open
View article: TURBULENCE AND PRESSURE FLUCTUATIONS CHARACTERISTICS OF DOWNSTREAM OF WEIR USING PARTICLE IMAGE VELOCIMETRY AND BUBBLE IMAGE VELOCIMETRY
TURBULENCE AND PRESSURE FLUCTUATIONS CHARACTERISTICS OF DOWNSTREAM OF WEIR USING PARTICLE IMAGE VELOCIMETRY AND BUBBLE IMAGE VELOCIMETRY Open
View article: Measurements of Void Fraction of Aerated Flows over Hydraulic Structures
Measurements of Void Fraction of Aerated Flows over Hydraulic Structures Open
View article: Experimental Study on Oscillatory Behavior of Hydraulic Jump Roller
Experimental Study on Oscillatory Behavior of Hydraulic Jump Roller Open
본 ì°êµ¬ë ëì(hydraulic jump)ì 롤ë¬(roller)ì ê±°ëì ë¶ìí기 ìí´ ìì기ë²ì ì´ì©í ì¤íì°êµ¬ë¥¼ ìííìë¤. ì¡°ìë¨í(tidal bore)ì ê±°ë í¹ì±ì ì´í´ì ì ì©í기 ìí´ íë¥ì¬ ìì¹ì…
View article: Measuring Inundation Depth in a Subway Station Using the Laser Image Analysis Method
Measuring Inundation Depth in a Subway Station Using the Laser Image Analysis Method Open
Subway station platforms are vulnerable to flood damage. Thus, investigation of inundation properties in subway platforms is required to ensure the safety of citizens against flooding. In this study, the evacuation time and safety were ana…
View article: Flow patterns over vegetation patches in the natural channel
Flow patterns over vegetation patches in the natural channel Open
This study carried out experiments to investigate the effects of vegetation patches of rooted willows on the flow pattern. Stream-scale experiments on vegetated flows were performed for various hydraulic conditions: emergent and submerged …
View article: Experimental study on the performance analysis of river levee using new substance for improving earth surface resistance
Experimental study on the performance analysis of river levee using new substance for improving earth surface resistance Open
The reasons why levee breaches during floods are largely due to overtopping, seepage, and structurally induced piping. According to an analysis of domestic and overseas reported cases of levee breaches, overtopping was found to be the caus…
View article: New methods for predicting and measuring dispersion in rivers
New methods for predicting and measuring dispersion in rivers Open
To develop a better predictive tool for dispersion in rivers over a range of temporal and spatial scales, our group has developed a simple Lagrangian model that is applicable for a wide range of coordinate systems and flow modeling methodo…
View article: Wave Energy Dissipation by Permeable and Impermeable Submerged Breakwaters
Wave Energy Dissipation by Permeable and Impermeable Submerged Breakwaters Open
The purpose of this study was to investigate the effect of the porosity of a submerged breakwater on wave fields, including snapshots of the wave, velocity profiles of the water over the structure, and the kinetic energy of the wave. Two-d…
View article: Wave Transformation Modeling with Effective Higher-Order Finite Elements
Wave Transformation Modeling with Effective Higher-Order Finite Elements Open
This study introduces a finite element method using a higher-order interpolation function for effective simulations of wave transformation. Finite element methods with a higher-order interpolation function usually employ a Lagrangian inter…
View article: Run-up Height around Axis-symmetric Topographies
Run-up Height around Axis-symmetric Topographies Open
본 연구에서는 수심이 해안선에서 0이 되며 임의로 변하는 축 대칭 지형의 주변을 통과하는 파를 해석하기 위하여 타원형 완경사 방정식을 이용한 수치모델을 개발하였다. 수치해석을 위해 전체 영역을 세 부분으로 구분하였는데, 안쪽 및 바깥쪽 영역에서는 기존 해석해를 활용하였으며, 가운데 영역에서는 지배방정식에서 유한요소기법을 적용하였다. 영역 1에서의 해석해는 변수분리법 및 Frobenius 급수를 사용하였다. 개발된 수치해는 기…