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Schüttrumpf Holger - One of the best experts on this subject based on the ideXlab platform.
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Influence of convex and concave curvatures in a Coastal dike line on wave run-up
'MDPI AG', 2019Co-Authors: Subramaniam, Suba Periyal, Scheres Babette, Schilling Malte, Liebisch Sven, Kerpen, Nils B., Schlurmann Torstern, Altomare Corrado, Schüttrumpf HolgerAbstract:Due to climatic change and the increased usage of Coastal areas, there is an increasing risk of dike failures along the coasts worldwide. Wave run-up plays a key role in the planning and design of a Coastal Structure. Coastal engineers use empirical equations for the determination of wave run-up. These formulae generally include the influence of various hydraulic, geometrical and structural parameters, but neglect the effect of the curvature of Coastal dikes on wave run-up and overtopping. The scope of this research is to find the effects of the dike curvature on wave run-up for regular wave attack by employing numerical model studies for various dike-opening angles and comparing it with physical model test results. A numerical simulation is carried out using DualSPHysics, a mesh-less model and OpenFOAM, a mesh-based model. A new influence factor is introduced to determine the influence of curvature along a dike line. For convexly curved dikes (ad = 210° to 270°) under perpendicular wave attack, a higher wave run-up was observed for larger opening angles at the center of curvature whereas for concavely curved dikes (ad = 90° to 150°) under perpendicular wave attack, wave run-up increases at the center of curvature as the opening angle decreases. This research aims to contribute a more precise analysis and understanding the influence of the curvature in a dike line and thus ensuring a higher level of protection in the future development of Coastal Structures.Peer Reviewe
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Influence of convex and concave curvatures in a Coastal dike line on wave run-up
'MDPI AG', 2019Co-Authors: Subramaniam, Suba Periyal, Scheres Babette, Schilling Malte, Liebisch Sven, Kerpen, Nils B., Schlurmann Torstern, Altomare Corrado, Schüttrumpf HolgerAbstract:Due to climatic change and the increased usage of Coastal areas, there is an increasing risk of dike failures along the coasts worldwide. Wave run-up plays a key role in the planning and design of a Coastal Structure. Coastal engineers use empirical equations for the determination of wave run-up. These formulae generally include the influence of various hydraulic, geometrical and structural parameters, but neglect the effect of the curvature of Coastal dikes on wave run-up and overtopping. The scope of this research is to find the effects of the dike curvature on wave run-up for regular wave attack by employing numerical model studies for various dike-opening angles and comparing it with physical model test results. A numerical simulation is carried out using DualSPHysics, a mesh-less model and OpenFOAM, a mesh-based model. A new influence factor is introduced to determine the influence of curvature along a dike line. For convexly curved dikes (ad = 210° to 270°) under perpendicular wave attack, a higher wave run-up was observed for larger opening angles at the center of curvature whereas for concavely curved dikes (ad = 90° to 150°) under perpendicular wave attack, wave run-up increases at the center of curvature as the opening angle decreases. This research aims to contribute a more precise analysis and understanding the influence of the curvature in a dike line and thus ensuring a higher level of protection in the future development of Coastal Structures.Peer ReviewedPostprint (published version
Pedro Lomonaco - One of the best experts on this subject based on the ideXlab platform.
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tsunami like wave induced lateral and uplift pressures and forces on an elevated Coastal Structure
Journal of Waterway Port Coastal and Ocean Engineering-asce, 2020Co-Authors: Mohammad S Alam, Daniel T Cox, Andrew O Winter, Krishnendu Shekhar, Michael R Motley, Marc O Eberhard, Andre R Barbosa, Pedro Arduino, Glen Galant, Pedro LomonacoAbstract:Abstract A large-scale physical model was constructed in the Large Wave Flume of Hinsdale Wave Research Laboratory (HWRL) at Oregon State University to develop a dataset of measured pressures and f...
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tsunami like wave forces on an elevated Coastal Structure effects of flow shielding and channeling
Journal of Waterway Port Coastal and Ocean Engineering-asce, 2020Co-Authors: Andrew O Winter, Pedro Lomonaco, Mohammad S Alam, Krishnendu Shekhar, Michael R Motley, Marc O Eberhard, Andre R Barbosa, Pedro Arduino, Daniel T CoxAbstract:Abstract During a tsunami event, neighboring Structures can significantly influence the forces experienced by an individual Structure within an urban community. To assess the effects of adjacent st...
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experimental modeling of horizontal and vertical wave forces on an elevated Coastal Structure
Coastal Engineering, 2017Co-Authors: Hyoungsu Park, Tori Tomiczek, Daniel T Cox, John W Van De Lindt, Pedro LomonacoAbstract:Abstract A large-scale physical model was created in Oregon State University's Large Wave Flume to collect an extensive dataset measuring wave-induced horizontal and vertical forces on an idealized Coastal Structure. Water depth was held constant while wave conditions included regular, irregular, and transient (tsunami-like) waves with different significant wave heights and peak periods for each test. The elevation of the base of the test specimen with respect to the stillwater depth (air gap) was also varied from at-grade to 0.28 m above the stillwater level to better understand the effects of raising or lowering a nearshore Structure on increasing or decreasing the horizontal and vertical wave forces. Results indicate that while both horizontal and vertical forces tend to increase with increasing significant wave height, the maximum and top 0.4% of forces increased disproportionally to other characteristic values such as the mean or top 10%. As expected, the horizontal force increased as the test specimen was more deeply submerged and decreased as the Structure was elevated to larger air gaps above the stillwater level. However, this trend was not true for the vertical force, which was maximized when the elevation of the base of the Structure was equal to the elevation of the stillwater depth. Small wave heights were characterized by low horizontal to vertical force ratios, highlighting the importance of considering vertical wave forces in addition to horizontal wave forces in the design of Coastal Structures. The findings and data presented here may be used by city planners, engineers, and numerical modelers, for future analyses, informed Coastal design, and numerical benchmarking to work toward enabling more resilient nearcoast Structures.
Javier L Lara - One of the best experts on this subject based on the ideXlab platform.
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numerical analysis of wave loads for Coastal Structure stability
Coastal Engineering, 2009Co-Authors: Raul Guanche, Inigo J Losada, Javier L LaraAbstract:Abstract The numerical model COBRAS-UC [Losada, I.J., Lara, J.L., Guanche,R., Gonzalez-Ondina, J.M. (2008). Numerical analysis of wave overtopping of rubble mound breakwaters. Coastal Engineering, Vol 55 (1), 47–62.] is used to carry out a two-dimensional analysis of wave induced loads on Coastal Structures. The model calculates pressure, forces and moments for two different cross-sections corresponding to a low-mound and a conventional rubble-mound breakwater with a crown-wall under regular and irregular incident wave conditions. Predicted results are compared with experimental information provided in Losada et al. [Losada, I.J., Lara, J.L., Guanche,R., Gonzalez-Ondina, J.M. (2008). Numerical analysis of wave overtopping of rubble mound breakwaters. Coastal Engineering, Vol 55 (1), 47–62.] and Lara et al. [Lara, J.L., Losada, I.J., Guanche, R. (2008). “Wave interaction with low mound breakwaters using a RANS model”. Ocean engineering (35), pp 1388–1400; doi:10.1016/j.oceaneng.2008.05.006.] on a 1:20 scale. Good agreement is found, and the differences between both typologies are explained in detail. Additionally, numerical results are also compared with several semi-empirical formulae recommended for design at both the 1:20 model scale and two prototype cross-sections. Results suggest that COBRAS-UC is able to provide realistic stability information that can be used to complete the approach based on currently existing methods and tools.
Subramaniam, Suba Periyal - One of the best experts on this subject based on the ideXlab platform.
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Influence of convex and concave curvatures in a Coastal dike line on wave run-up
'MDPI AG', 2019Co-Authors: Subramaniam, Suba Periyal, Scheres Babette, Schilling Malte, Liebisch Sven, Kerpen, Nils B., Schlurmann Torstern, Altomare Corrado, Schüttrumpf HolgerAbstract:Due to climatic change and the increased usage of Coastal areas, there is an increasing risk of dike failures along the coasts worldwide. Wave run-up plays a key role in the planning and design of a Coastal Structure. Coastal engineers use empirical equations for the determination of wave run-up. These formulae generally include the influence of various hydraulic, geometrical and structural parameters, but neglect the effect of the curvature of Coastal dikes on wave run-up and overtopping. The scope of this research is to find the effects of the dike curvature on wave run-up for regular wave attack by employing numerical model studies for various dike-opening angles and comparing it with physical model test results. A numerical simulation is carried out using DualSPHysics, a mesh-less model and OpenFOAM, a mesh-based model. A new influence factor is introduced to determine the influence of curvature along a dike line. For convexly curved dikes (ad = 210° to 270°) under perpendicular wave attack, a higher wave run-up was observed for larger opening angles at the center of curvature whereas for concavely curved dikes (ad = 90° to 150°) under perpendicular wave attack, wave run-up increases at the center of curvature as the opening angle decreases. This research aims to contribute a more precise analysis and understanding the influence of the curvature in a dike line and thus ensuring a higher level of protection in the future development of Coastal Structures.Peer Reviewe
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Influence of convex and concave curvatures in a Coastal dike line on wave run-up
'MDPI AG', 2019Co-Authors: Subramaniam, Suba Periyal, Scheres Babette, Schilling Malte, Liebisch Sven, Kerpen, Nils B., Schlurmann Torstern, Altomare Corrado, Schüttrumpf HolgerAbstract:Due to climatic change and the increased usage of Coastal areas, there is an increasing risk of dike failures along the coasts worldwide. Wave run-up plays a key role in the planning and design of a Coastal Structure. Coastal engineers use empirical equations for the determination of wave run-up. These formulae generally include the influence of various hydraulic, geometrical and structural parameters, but neglect the effect of the curvature of Coastal dikes on wave run-up and overtopping. The scope of this research is to find the effects of the dike curvature on wave run-up for regular wave attack by employing numerical model studies for various dike-opening angles and comparing it with physical model test results. A numerical simulation is carried out using DualSPHysics, a mesh-less model and OpenFOAM, a mesh-based model. A new influence factor is introduced to determine the influence of curvature along a dike line. For convexly curved dikes (ad = 210° to 270°) under perpendicular wave attack, a higher wave run-up was observed for larger opening angles at the center of curvature whereas for concavely curved dikes (ad = 90° to 150°) under perpendicular wave attack, wave run-up increases at the center of curvature as the opening angle decreases. This research aims to contribute a more precise analysis and understanding the influence of the curvature in a dike line and thus ensuring a higher level of protection in the future development of Coastal Structures.Peer ReviewedPostprint (published version
Tomoya Shibayama - One of the best experts on this subject based on the ideXlab platform.
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effect of bed roughness on tsunami bore propagation and overtopping
Coastal Engineering, 2020Co-Authors: Miguel Esteban, Jochem Jan Roubos, Kotaro Iimura, Jorrit Thomas Salet, Bas Hofland, Jeremy D Bricker, Hidenori Ishii, Go Hamano, Tomoyuki Takabatake, Tomoya ShibayamaAbstract:Abstract The accurate modelling of overtopping of Coastal defences by tsunami waves is of vital importance for the formulation of disaster management strategies. To improve knowledge of this phenomena the authors conducted experiments on Coastal Structure overtopping using bores that were generated by a dam-break mechanism. Three types of Structures were tested, namely a Coastal dyke, a wall, and a wall of infinite height. The results highlight the necessity to consider the energy present in a bore to determine if a Structure will be overtopped or not. As a result of these experiments an empirical formula to determine the height of overtopping given the incident bore height and velocity was validated. The study highlights the importance of clearly modelling the velocity and Froude number of a tsunami. Such experiments should be conducted on rough beds, for which a suitable Manning's n seems to be around 0.06 sm-1/3. The study also contrasted the results obtained to those of the ASCE7 method, and concludes that the Manning's n values recommended in ASCE7 are probably too low.
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PREDICTIVE MODEL FOR SCOUR DEPTH OF Coastal Structure FAILURES DUE TO TSUNAMIS
Coastal Engineering Proceedings, 2014Co-Authors: Ravindra Jayaratne, Adewale Abimola, Takahito Mikami, Shunya Matsuba, Miguel Esteban, Tomoya ShibayamaAbstract:Post-tsunami field surveys carried out after the 2011 Great Eastern Japan Earthquake Tsunami revealed that scour around the landward side of concrete sea dikes and seawalls was the most dominant failure mechanism. To better understand this phenomenon, detailed scour data were collected and soil samples from the surveyed locations in Miyagi and Fukushima Prefectures of Japan were comprehensively analysed. Mathematical modeling technique was employed with various combinations of input variables considered in order to determine the effective variables needed to predict the representative scour depth at the leeward of a concrete sea dike or seawall and possible design of these Coastal Structures against tsunami impact. Parameters such as impact overflowing pressure, height of Structure measured at the landward side, inundation height, inundation velocity, angle of landward slope, Darcy’s coefficient of permeability and scour depth were found to be the effective parameters essential to generate proposed scour depth predictive model. The results indicate that the hydrodynamic parameters, soil properties and physical geometry of Coastal Structure play a crucial role in the scour process of such Structures. In addition to that, numerical experiments were also performed in order to understand the characteristics of tsunami flow around a typical Coastal dike, and to propose preliminary guidelines for Structure resilience against future tsunamis.