Yonghwan Cho

Yonghwan Cho
Nagoya University | Meidai · Department of Civil Engineering

About

34
Publications
323
Reads
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27
Citations
Citations since 2017
32 Research Items
27 Citations
2017201820192020202120222023024681012
2017201820192020202120222023024681012
2017201820192020202120222023024681012
2017201820192020202120222023024681012

Publications

Publications (34)
Article
For long-term coastal monitoring, deep learning was applied to images from fixed cameras installed on the coast to estimate wave conditions. Datasets created from images of the Shichiri Mihama Ida coast in Mie Prefecture and the Hasaki coast in Ibaraki Prefecture and wave information obtained from NOWPHAS were used to compare wave estimation accura...
Article
The effectiveness of flume-type anti-oscillation tanks against the motion of a floating caisson under regular, unidirectional irregular, and multi-directional irregular waves was investigated using hydraulic experiments. From experimental results, it was found that the non-dimensional total amplitude of the pitch was reduced with an increase in the...
Article
Climate change effects have become global concern through decades due to its emerging hazards. Sea Level Rise (SLR) is one of the effects which may cause harm to the coastal communities due to the risk of damages, such as shoreline retreat and beach erosion. There are many previous studies regarding the effect of SLR on sandy beaches. However, the...
Article
Two-dimensional hydraulic experiments were conducted using a reversed triangular bottom-hinged flap with the reflection wall behind it. Electricity generation performance when the power take-off system is installed was evaluated from the experimental result based on linear theory. Efficiency is lowest near the antinodes of the standing waves. There...
Article
The effectiveness and mechanism of flume-type anti-oscillation tanks against the motion of a floating caisson under regular waves was investigated from hydraulic experiments. From experimental results, it was found that the amplitude of heave was little affected by free water filled in the anti-oscillation tanks. In contrast, the maximum value of t...
Article
The paper presents power generation characteristics of the proposed wave energy converter based on the bottom-hinged pendulum. The pendulum behavior becomes unstable and the power generation efficiency decreases when the wave energy is small, and the pendulum is installed at the position of D/L ≈ 0.5, which is the antinode of the standing wave. Whe...
Article
In order to reduce the motion of a floating caisson, the effectiveness of a footing was investigated in terms of its width. Free oscillation experiments showed that the natural period of the pitch and the nonlinear extinction coefficients of the heave and pitch increased with the relative footing width. Forced oscillation experiments showed that th...
Article
A temporary floating breakwater has been proposed to keep calm wave conditions in an offshore construction site. In this study, its wave damping mechanism was investigated from numerical simulations. Numerical results showed that the trend of the transmission coefficient can be predicted reasonably well. Furthermore, an energy damping coefficient o...
Article
Tsunami-induced force acting on an inland building located at the landward side of a coastal protection facility with resilient structure combined with a coastal dike and an embankment was investigated numerically. Numerical results showed that the relationship between the tsunami force considering the erosion of the embankment and that assuming th...
Article
Numerical analyses of 1/55.8-scale small experiments and 1/4-scale large experiments on sand erosion under the rubble mound of a composite breakwater were conducted to investigate the effect of wave field on the time scale of the erosion. Numerical results showed that the time for the averaged flow inside the mound to be offshore throughout the mou...
Article
This study describes the improvement of the image analysis of network camera using the orthomosaic created from UAV-SfM/MVS survey and the morphological characteristics of Shichiri-Mihama Ida beach based on the estimated shoreline positions extracted by a network camera and DEM obtained by UAV-SfM/MVS survey. The estimated shoreline extracted from...
Article
A simple method to deal with unsaturated soil for the volume-of-fluid (VOF) method was proposed and incorporated into a VOF-based numerical model, FS3M. Furthermore, the FS3M was improved to compute unsaturated seepage flow more accurately. From comparison with experimental data, the predictive capability of the improved FS3M was demonstrated for u...
Article
The effectiveness of gabions against tsunami-induced scour at the landward toe of a coastal dike was investigated from hydraulic experiments. Experimental results showed that the installation of gabions moved a scour hole landward and reduced its maximum depth. This effect was reconfirmed from the hydraulic experiments in addition to existing numer...
Article
The effectiveness of flume-type anti-oscillation tanks installed on a floating caisson in the pitch and roll directions under regular waves and multi-directional irregular waves was investigated from hydraulic experiments, and a simple numerical method for estimating the effect of the anti-oscillation tanks was developed and applied to the hydrauli...
Article
To prevent the overturning of caissons due to overflow tsunamis, the effectiveness of configuration change in the caissons was investigated from hydraulic experiments and numerical analyses. From experimental and numerical results, it was found that the resilience of a trapezoidal caisson was higher than that of a rectangular caisson and an L-shape...
Article
In this study, to evaluate the effectiveness of the FS3M for assessing the countermeasures of beach erosion, the model was applied to the real-scale domain. We used the FS3M, which is a computational fluid dynamic model using the Navier-Stokes equation, and the survey data provided by Mie Prefecture. To address the problem of calculation cost, the...
Article
A temporary floating breakwater has been proposed to keep calm wave conditions in an offshore construction site. In this study, its transmission coefficient and dynamic behavior were investigated from hydraulic experiments. Experimental results showed that the transmission coefficient decreased with an increase in the wave steepness and relative br...
Article
A three-dimensional coupled fluid-structure-sediment-seabed interaction model (FS3M) was applied to hydraulic experiments on the effectiveness of gabions against tsunami scour at the landward toe of a coastal dike. Numerical results showed that the predictive capability of the FS3M was demonstrated in terms of temporal change in the maximum scour d...
Article
This paper describes the method to calculate sediment transport in the mixed soil condition composed of sand and clay considering the change of clay contents due to clay loss. The concepts of the four-phase soil model and the maximum clay contents classifying mixed soil status were introduced into the method. The model incorporating the proposed me...
Article
The 2011 Tohoku earthquake tsunami caused a catastrophic disaster along the northeast coast of the Honshu Island, Japan. To deal with such massive tsunamis (identified as “level 2” tsunamis in Japan), the concept of disaster mitigation using multifaceted countermeasures is essential in addition to the construction of shore protection facilities for...
Article
This paper presented the beach morphological characteristics at Shichiri-mihama Ida coast based on the UAV-SfM/MVS results for 2 years focusing on the volumetric change and the correlation between the run-up height and the morphological change. As a result, erosion predominates in the leeward side between the artificial reefs during high waves and...
Article
To determine the beach profile evolution of gravel beach under the irregular waves, the hydraulic experiments were conducted. A gravel beach with a slope of 1/7 was installed and the change of spatiotemporal profile according to the irregular wave was analyzed during 6 hours. Two types of beach profile deformation (reflective/step type) occurred un...
Article
Maximum wave force induced by a run-up tsunami containing suspended sediment was investigated using a numerical model considering change in fluid density and viscosity due to suspended sediment. Numerical results showed that the maximum tsunami force induced by quasi-steady wave pressure can be evaluated conservatively from that for no suspended se...
Article
In this study, 1/55.8-scale hydraulic experiments modelled on 1/4-scale large experiments in Suzuki et al. (2002) were carried out as a first step to organize what should be considered in determining the sizes of mound gravel and seabed sand for composite breakwaters covered with wave dissipating blocks. Experimental results showed that sand deposi...
Article
This study describes the stability of PC sleeper applied to the base of Inochi-yama, one of the tsunami evacuation facilities, against tsunami based on laboratory experiments. The experimental results showed that there are three representative damage patterns of PC sleeper, which are the damage in lower layer, upper layer and total layer. The lower...
Article
In this study, 1/55.8-scale hydraulic experiments on a composite breakwater with gabions like large-scale hydraulic experiments were carried out to organize what should be considered in determining the sizes of mound gravel and seabed sand. Experimental results showed that same flow fields around the breakwater were formed as hydraulic experiments...
Article
In this paper, the failure mechanism of armor blocks of submerged breakwater focusing on the top of the slope where the most block failures are concentrated was described. Hydraulic experiments and numerical simulations using FS3M were conducted. As a result, it was confirmed that the failure of armor blocks was dominant at the top of the seaward c...
Article
In this study, the characterisitcs of topographic change at Shichiri-mihama Ida coast, located in the southern part of Mie prefecture, was discussed by means of discriminant analysis based on shoreline change characteristics analyzed by network camera and wave data, and SfM-MVS analysis using UAV. As a result, the shoreline extraction using Sobel G...
Article
Tsunami-induced flow fields around the landward toe of a coastal dike and the effectiveness of countermeasures against local scouring were investigated from full-scale numerical simulations. Numerical results showed that the flow fields were classified into two patterns, i.e., a submerged flow which ran down on the landward slope and submerged unde...
Article
The three-dimensional (3-D) behavior of a sloping-top caisson floating near a fixed existing caisson was investigated using a 3-D coupled fluid-structure-sediment-seabed interaction model (FS3M). From comparison with hydraulic experiments, the predictive capability of the FS3M was demonstrated in terms of the amplitude of the motion of the caisson...
Article
A hindcast wave model was built using the SWAN model to estimate wave fields in front of the Ida beach. To verify its accuracy, estimated hindcast results were compared with NOWPHAS wave data. From numerical results, it was found that the hindcast results were in good agreement in terms of the significant wave height. Although the mean wave period...
Article
A computational procedure for long-term beach profile change was proposed and incorporated into a three-dimensional coupled fluid-structure-sediment-seabed interaction model (FS3M), and numerical experiments on long-term surface profile change in a gravel beach were conducted using the improved FS3M to examine the sensitivity of the size of numeric...
Article
The three-dimensional behavior of a floating sloping-top caisson was investigated using hydraulic experiments. Experimental results showed that a decrease in the relative caisson width resulted in an increase in the amplitudes of the heave and roll under no-mooring conditions and an increase in the amplitudes of the surge, heave, roll, and pitch un...

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