Article
Engineering, Civil
Yuan Li, Chi Zhang, Shaohua Zhao, Hongshuai Qi, Feng Cai, Jinhai Zheng
Summary: Sandy-muddy transitional beaches (SMT-Beaches) are a type of coastal formation consisting of upper sandy beach and lower mudflat. This study examined the morphological characteristics of SMT-Beaches and the mechanisms of the formation of sandmud transition (SMT) boundary. Field surveys were conducted on SMT-Beaches in South China Coasts and a new equilibrium profile function for SMT-Beaches was developed. The function demonstrated good performance and improved accuracy compared to traditional methods. It was also found that sediment characteristics differ on both sides of the SMT boundary, with clay-to-silt grains increasing seaward.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
Zhihao Shen, Duruo Huang, Gang Wang, Feng Jin
Summary: In this study, a resolved CFD-DEM coupling procedure was proposed to study the interaction of waves and irregularly shaped armour units. The model was validated by comparing the numerical results with a flume wave erosion test. The influence of armour shape on overtopping discharge, pressure distribution, and vortex structure was also studied.
COASTAL ENGINEERING
(2024)
Article
Engineering, Ocean
Knut Andreas Kvale, Bernt Leira, Ole Oiseth
Summary: As future floating bridges become longer, the chance of encountering significant inhomogeneous wave conditions increases. This paper presents an approach to model these conditions using generalized harmonic decomposition and applies it to a conceptual floating bridge model in Norway. The paper focuses on frequency-domain simulation and highlights the importance of considering the coherency in swell sea conditions.
APPLIED OCEAN RESEARCH
(2024)
Article
Engineering, Ocean
Canjun Yang, Dingze Wu, Puzhe Zhou, Shuyang Ma, Rui Zhou, Xin Zhang, Yang Zhang, Qingchao Xia, Zeliang Wu
Summary: The Argo Global Ocean Observing Network is the preeminent ocean observation network worldwide, but its buoys fail to complete long-term observations in designated sea areas due to their lack of lateral movement. To solve this problem, a portable underwater profiler (PUP) that combines buoy and underwater glider functionalities was developed. The PUP is lightweight, allows for rapid deployment, and enables continuous observation.
APPLIED OCEAN RESEARCH
(2024)
Article
Engineering, Civil
Myung Jin Koh, Hyoungsu Park, Albert S. Kim
Summary: A framework combining tsunami flow model and debris transport model is developed to evaluate the kinematics of multiple debris and sequential hazards in a coastal community. The impact of tsunami-driven debris at Honolulu Harbor, Hawaii is assessed by simulating the motion of 2500 shipping containers under a hypothetical tsunami event. New types of intensity measures for tsunami-driven debris hazards are introduced, and hazard maps showing the potential impact loadings from debris dispersion are presented.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
Jana Haddad, Johanna H. Rosman, Richard A. Luettich, Christine M. Voss
Summary: Understanding wave transformation in marsh vegetation canopies is crucial for assessing nature-based shoreline strategies. This study investigates the challenges of accurately modeling wave dissipation in coastal marshes and proposes a new dimensionless parameter to represent the canopy drag coefficient (C-D). The study finds that uncertainties in vegetation measurements lead to variations in C-D expressions, and suggests using the Cauchy number (Ca) as the more appropriate parameter for larger waves.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
He Ma, Ludi Xu, Samuel Ukpong Okon, Peng Hu, Wei Li, Huabin Shi, Zhiguo He
Summary: This study presents a coupled model to predict morphodynamic changes during storm surges. The model accurately simulates the morphological evolution of the Santa Rosa barrier island caused by Hurricane Ivan's storm surge.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
Xinyu Hou, Zhonghua Weng, Xin Chen, Gengfa Chen
Summary: A single-phase model is proposed to predict sediment motion on vortex rippled bed under wave action. The model takes into account the acceleration effect of bottom sediment, the development of asymmetric boundary layer, and the sediment phase-lag, and successfully predicts the velocity, concentration, and development of sediment cloud on vortex ripples.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
Dirk P. Rijnsdorp, Arnold van Rooijen, Ad Reniers, Marion Tissier, Floris de Wit, Marcel Zijlema
Summary: This paper extends the non-hydrostatic wave-flow model SWASH to account for the influence of a depth-uniform ambient current on wave dynamics. The model's ability is verified by comparing predictions to results from linear theory, laboratory experiments, and a spectral wave model. The extended model accurately captures current-induced changes in the wave field and simulations of wave dynamics in the presence of strong opposing currents.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
Mark Loveland, Eirik Valseth, Jessica Meixner, Clint Dawson
Summary: This article discusses the importance of using numerical models to predict the wind wave spectrum of the ocean. The article explores various finite element discretizations of the Wave Action Balance Equation and examines their convergence properties through simplified 2-D test cases. It also introduces a new spectral wind wave model called WAVEx and its implementation method.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
Salika Thilakarathne, Takayuki Suzuki, Martin Mall
Summary: This study quantifies the susceptibility of sandy beaches to storm-induced erosion by analyzing 14 morphometric indicators. Using a 24-year dataset, the study identifies 347 storms and their beach responses. The study found that beach profiles can be categorized into four types, and the contribution of morphometric indicators to beach susceptibility varies depending on the profile type.
COASTAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Marine
Hongdan Liu, Zhicheng Jia, Bing Li, Yan Liu, Zhigang Qi
Summary: This paper explores the monitoring and detection mechanism of vessel abnormal behavior based on Graph Attention Prediction and Reconstruction Network. It proposes a sliding window mechanism to generate fixed data input, effectively capturing the inter-dependencies among vessel behavior characteristics. The proposed mechanism dynamically adjusts the anomaly detection threshold based on variations in the marine environment, leading to an enhancement in the accuracy of detecting abnormal behavior in vessels.
Article
Engineering, Marine
Heath Palmer, Ming Zhao, Helen Wu, Pan Hu, Mohammad Rashed Mia, Chengwang Lei
Summary: This study investigates the improvement of hydrodynamic efficiency in dual chamber oscillating water columns (OWC) through numerical simulations. The results show that the dual chamber dual turbine configuration achieves higher efficiency compared to single chamber single turbine and dual chamber shared turbine configurations, operating over a broader range of wavelengths.
Article
Engineering, Marine
Ashok Kumar Pradhan, Ashok Kumar Barik, Manmatha Kumar Roul, Prafulla Kumar Swain
Summary: This study examines the tandem hydrofoil with two new flapping trajectories, elliptical and fishtail, to enhance induced thrust. Computational methods are used to analyze the hydrodynamic efficiency and the effects of Strouhal number and inter-foil spacing on the tandem hydrofoil.
Article
Engineering, Marine
Domenico Ferraro, Francesco Aristodemo, Agostino Lauria, Emilio Lazzaro, Davide Pasquali, Marcello Di Risio
Summary: This paper addresses the influence of waves on propeller jets in unconfined conditions, leading to alterations in scour and deposition patterns. Experimental tests and numerical simulations were conducted to investigate the effects of wave-induced velocity on the propeller jets hydrodynamics, providing insights into the complex bathymetry configuration induced by the propeller jet and waves.
Article
Engineering, Marine
Jingcheng Wang, Aijun Ye, Lianxu Zhou
Summary: This study reveals the ductile seismic behavior of scoured pile group foundations considering the pile uplift behavior. Quasi-static tests were conducted on reinforced concrete pile group specimens, and the experimental results were compared and discussed. The findings indicate that pile uplift reduces lateral strength and residual deformation, but increases displacement ductility of the foundation.
Article
Engineering, Marine
Pooya Rezadoost, Hossein Nassiraei
Summary: This study focuses on identifying the most suitable probability distribution models for the ultimate strength of FRP-strengthened X-shaped tubular joints under axial loads. The accuracy of finite element models is verified through comparisons with experimental results, and extensive analyses are conducted to generate reliable datasets. The findings indicate that the Generalized Extreme Value distribution and the Burr distribution are the best models for characterizing the ultimate strength under compressive and tensile axial loads, respectively. The probability differences between the proposed models for compressive and tensile loads are minimal, enhancing the reliability and confidence in predicting the behavior and performance of these joints.
Article
Engineering, Marine
Minji Kim, Vladas Pipiras, Arthur M. Reed, Kenneth Weems
Summary: This study addresses the problem of obtaining forces for lower-fidelity models by regressing forces from higher-fidelity models, and provides numerical simulations for verification.
Article
Engineering, Marine
Jongdae Jung, Jeonghong Park, Yeongjun Lee, Tae-Kyeong Yeu, Jinwoo Choi, Jong-bu Han
Summary: In this study, a structural monitoring system using an autonomous surface vehicle (ASV) is proposed for inspecting offshore power plants in harsh ocean conditions. The ASV incorporates navigation sensors to accurately estimate its motion in ocean disturbances and is equipped with multi-modal sensors for mapping underwater and surface structures. The system also utilizes outlier removal methods to improve mapping performance.
Article
Engineering, Marine
S. A. Brown, T. Tosdevin, S. Jin, M. Hann, D. Simmonds, D. M. Greaves
Summary: This paper explores the application of short design waves in offshore wind energy, specifically on semi-submersible platforms. Short design waves show promise in certain aspects but require further refinement and validation.
