Effects of Roughness and Vertical Wall Factors on Wave Overtopping in Rubble Mound Breakwaters in Busan Yacht Harbor

Dodaran, Asgar Ahadpour; Park, Sang Kil; Kim, Kook Hyun; Shahmirzadi, M.E. Meshkati; Park, Hong Bum

doi:10.5574/ksoe.2015.29.1.062

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…The wave generator paddle at a 0 • angle wave attack provided mechanically irregular waves on the flume. The generator was controlled by a computer program [57]. The program was developed for simulating regular, irregular, and a variety of other wave conditions.…”

Section: Wave Attack Simulationmentioning

confidence: 99%

Range Image Technique for Change Analysis of Rock Slopes Using Dense Point Cloud Data

et al. 2018

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The use of a terrestrial laser scanner is examined to measure the changes of rock slopes subject to a wave attack test. Real scenarios are simulated in a water flume facility using a wave attack experiment representing a storm of 3000 waves. The stability of two rock slopes of different steepness was evaluated under the set conditions. For quantification of the changes of the slopes after the wave attack test, terrestrial laser scanning was used to acquire dense 3D point cloud data sampling for slope geometries before and after the wave attack experiment. After registration of the two scans, representing situations before and after the wave attack, the cloud-to-cloud distance was determined to identify areas in the slopes that were affected. Then, a range image technique was introduced to generate a raster image to facilitate a change analysis. Using these raster images, volume change was estimated as well. The results indicate that the area around the artificial coast line is most strongly affected by wave attacks. Another interesting phenomenon considers the change in transport direction of the rocks between the two slopes: from seaward transport for the steeper slope to landward transport for the milder slope. Using the range image technique, the work in this article shows that terrestrial laser scanning is an effective and feasible method for change analysis of long and narrow rock slopes.

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Section: Wave Attack Simulationmentioning

confidence: 99%

Range Image Technique for Change Analysis of Rock Slopes Using Dense Point Cloud Data

et al. 2018

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“…Complex coastal terrain and tortuous coastline result in the irregular external contour of harbors, which is unlike regular-shaped buildings such as airports, railway stations, and buildings. Also, due to different functions and applications, the diversification of shapes makes harbors difficult to describe with unified features [29,30]. Moreover, harbor detection is usually carried out in large scene images, which requires low computational complexity of detection methods, and can quickly locate regions of interest.…”

Section: Introductionmentioning

confidence: 99%

A Multidirectional One-Dimensional Scanning Method for Harbor Detection From SAR Images

Wang¹,

Pei²,

Xu³

et al. 2021

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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With the development of economic globalization, coastal harbors have become an increasingly important gateway for international trade. Synthetic aperture radar (SAR) is an important microwave sensor with high resolution imaging capability. Harbor detection in SAR images is of great significance for timely obtaining coastal intelligence of a country. However, due to its complexity and diversity, harbor detection is challenging. In this paper, a harbor detection method based on multidirectional one-dimensional scanning is proposed. First, discrete coastline to obtain control points, and multiple directions are selected at each control point, values of scanned pixels in each direction are recorded to obtain the representation vector. Then, design a onedimensional convolutional neural network for harbor features identification of representation vectors. Finally, the harbors are located by clustering feature points. The proposed method can extract vectors to characterize the distribution of land, waters, and wharfs. Therefore, the problem of object detection in twodimensional images is transformed into the identification of representation vectors. The method is effective for harbors with various scales and forms and has low computational complexity. Experimental results on spaceborne SAR images demonstrate the effectiveness of the proposed method.

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“…The spectrum represents a typical Dutch storm consisting of 3000 waves. The wave attack was simulated by a wave generator (Dodaran et al 2015). The tests are done in the water flume of Delft University of Technology and the flume has a length of 40m, a width of 0.8m and a height of 0.9m.…”

Section: Introductionmentioning

confidence: 99%

Change Analysis of Laser Scans of Laboratory Rock Slopes Subject to Wave Attack Testing

Shen¹,

Lindenbergh²,

Hofland³

et al. 2017

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:For better understanding how coastal structures with gentle slopes behave during high energy events, a wave attack experiment representing a storm of 3000 waves was performed in a flume facility. Two setups with different steepness of slope were compared under the same conditions. In order to quantify changes in the rock slopes after the wave attack, a terrestrial laser scanner was used to obtain 3D coordinates of the rock surface before and after each experiment. Next, through a series of processing steps, the point clouds were converted to a suitable 2D raster for change analysis. This allowed to estimate detailed and quantitative change information. The results indicate that the area around the artificial coast line, defined as the intersection between sloped surface and wave surface, is most strongly affected by wave attacks. As the distances from the sloped surface to the waves are shorter, changes for the mildly sloped surface, slope 1 (1:10), are distributed over a larger area compared to the changes for the more steeply sloped surface, slope 2 (1:5). The results of this experiment show that terrestrial laser scanning is an effective and feasible method for change analysis of rock slopes in a laboratory setting. Most striking results from a process point of view is that the transport direction of the rocks change between the two different slopes: from seaward transport for the steeper slope to landward transport for the milder slope.

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Effects of Roughness and Vertical Wall Factors on Wave Overtopping in Rubble Mound Breakwaters in Busan Yacht Harbor

Cited by 3 publications

References 9 publications

Range Image Technique for Change Analysis of Rock Slopes Using Dense Point Cloud Data

Range Image Technique for Change Analysis of Rock Slopes Using Dense Point Cloud Data

A Multidirectional One-Dimensional Scanning Method for Harbor Detection From SAR Images

Change Analysis of Laser Scans of Laboratory Rock Slopes Subject to Wave Attack Testing

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