Coastal Engineering最新文献

{"title":"Physics informed neural network modelling for storm surge forecasting — A case study in the Bohai Sea, China","authors":"Zhicheng Zhu ,&nbsp;Zhifeng Wang ,&nbsp;Changming Dong ,&nbsp;Miao Yu ,&nbsp;Huarong Xie ,&nbsp;Xiandong Cao ,&nbsp;Lei Han ,&nbsp;Jinsheng Qi","doi":"10.1016/j.coastaleng.2024.104686","DOIUrl":"10.1016/j.coastaleng.2024.104686","url":null,"abstract":"<div><div>Storm surges have a great impact on ocean engineering and design complex physical changes. Numerical simulation methods are often used for prediction, but they face problems such as long calculation time. Machine learning avoids these, but it also faces some problems, such as delays in predicting results, short prediction durations, and large data demands. Therefore, we built a PINN model to integrate storm surge physics with neural networks to reduce the need for data and improve the accuracy of storm surge forecasting. Using ADCIRC as a smaller dataset, the cold wave storm surge in Bohai Bay during 2018–2022 was simulated. In the storm surge process prediction experiment, the overall error of PINN is small, RMSE is 0.163. In a 48-h prediction experiments, RMSE of PINN's result is 0.241, which is more accurate than DNN. It is revealed that PINN has a strong physical mechanism learning ability. PINN can predict the storm surge of strong cold wave more accurately, the calculation speed is nearly one thousand times faster than ADCIRC, and it has broad application prospect in disaster prevention and reduction.</div></div>","PeriodicalId":50996,"journal":{"name":"Coastal Engineering","volume":"197 ","pages":"Article 104686"},"PeriodicalIF":4.2,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Data-driven shoreline modelling at timescales of days to years","authors":"Joshua A. Simmons,&nbsp;Kristen D. Splinter","doi":"10.1016/j.coastaleng.2024.104685","DOIUrl":"10.1016/j.coastaleng.2024.104685","url":null,"abstract":"<div><div>An increased availability of long-term coastal imaging datasets has opened the door to the use of data-driven modelling approaches to predict shoreline evolution in response to wave and water level conditions. In this study an autoregressive neural network approach has been applied to predict shoreline change over daily to yearly timescales. A dataset comprising two embayed beaches (Narrabeen Beach, Australia and Tairua Beach, New Zealand) has been used, spanning 10 years of daily shoreline position observation at each site. The model shows good cross-validation performance, predicting the shoreline position with an average 4.64 m RMSE (0.78 NMSE) at Tairua and 5.73 m RMSE (0.46 NMSE) at Narrabeen over approximately 2-year test periods.</div><div>The autoregressive component of the model involved the use of the last predicted shoreline position in the prediction of shoreline change over the next timestep. This “memory” of past conditions was found to be crucial to maintaining model stability and prediction accuracy over timescales of weeks to years. Model outputs were interrogated to show the structure of the equilibrium response to previous shoreline position which was more prevalent at Tairua. The model is quite robust to changes in the quantity and temporal resolution of the training data, though training data of more than 2-years was desirable, particularly at Narrabeen.</div></div>","PeriodicalId":50996,"journal":{"name":"Coastal Engineering","volume":"197 ","pages":"Article 104685"},"PeriodicalIF":4.2,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental investigation of evolution of infragravity waves over a large-scale shoal","authors":"Zhiling Liao ,&nbsp;Ye Liu ,&nbsp;Wenhe Liu ,&nbsp;Shaowu Li ,&nbsp;Qingping Zou","doi":"10.1016/j.coastaleng.2024.104687","DOIUrl":"10.1016/j.coastaleng.2024.104687","url":null,"abstract":"<div><div>This study investigates the amplification of infragravity waves induced by short-wave groups over an underwater shoal, as well as their irreversible growth following the processes of shoaling and deshoaling across front and rear slopes of the shoal under various wave conditions. Through laboratory experiments, we observed that, in scenarios without short-wave breaking, the amplification of infragravity waves increased with the peak frequency and spectral width of incident short waves, while decreasing with the water depth atop the shoal. These dependencies were further conceptualized through the introduction of a normalized shoal length, which represents the spatial accumulation of local energy transfer from short to infragravity waves. The normalized shoal length was proved to be equivalent to the normalized bed slope by Battjes et al. (2004), expanding its physical interpretation to include the travel distance of the wave groups. Additionally, the near-resonance solution for infragravity waves by Liao et al. (2021) was extended to incorporate wave attenuation effects, especially under conditions of short-wave breaking within the surf zone where infragravity waves rapidly decay. The modified solution aligns closely with experimental observations regarding infragravity-wave height and phase coupling with short-wave groups. The detailed wave measurements from shoaling to deshoaling zones are useful for enhancing understanding of infragravity wave dynamics over complex seabed features.</div></div>","PeriodicalId":50996,"journal":{"name":"Coastal Engineering","volume":"197 ","pages":"Article 104687"},"PeriodicalIF":4.2,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tsunami debris motion and loads in a scaled port setting: Comparative analysis of three state-of-the-art numerical methods against experiments","authors":"Justin Bonus ,&nbsp;Felix Spröer ,&nbsp;Andrew Winter ,&nbsp;Pedro Arduino ,&nbsp;Clemens Krautwald ,&nbsp;Michael Motley ,&nbsp;Nils Goseberg","doi":"10.1016/j.coastaleng.2024.104672","DOIUrl":"10.1016/j.coastaleng.2024.104672","url":null,"abstract":"<div><div>We present an international comparative analysis of simulated 3D tsunami debris hazards, applying three state-of-the-art numerical methods: the Material Point Method (MPM, ClaymoreUW, multi-GPU), Smoothed Particle Hydrodynamics (SPH, DualSPHysics, GPU), and Eulerian grid-based computational fluid dynamics (Simcenter STAR-CCM+, multi-CPU/GPU). Three teams, two from the United States and one from Germany, apply their unique expertise to shed light on the state of advanced tsunami debris modeling in both open source and professional software. A mutually accepted and meaningful benchmark is set as 1:40 Froude scale model experiments of shipping containers mobilized into and amidst a port setting with simplified and generic structures, closely related to the seminal Tohoku 2011 tsunami case histories which majorly affected seaports. A sophisticated wave flume at Waseda University in Tokyo, Japan, hosted the experiments as reported by Goseberget al. (2016b). Across dozens of trials, an elongated vacuum-chamber wave surges and spills over a generic harbor apron, mobilizing 3–6 hollow debris-modeling sea containers-, in 1–2 vertical layers against friction. One to two rows of 5 square obstacles are placed upstream or downstream of the debris, with widths and gaps of 0.66x and 2.2x of debris length, respectively. The work reports and compares results on the long wave generation from a vacuum-controlled tsunami wave maker, longitudinal displacement of debris forward and back, lateral spreading angle of debris, interactions of stacked debris, and impact forces measured with debris accelerometers and/or obstacle load-cells. Each team writes a foreword on their digital twin model, which are all open-sourced. Then, preliminary statistical analysis contrasts simulations originating off different numerical methods, and simulations with experiments. Afterward, team’s give value propositions for their numerical tool. Finally, a transparent cross-interrogation of results highlights the strengths of each respective method.</div></div>","PeriodicalId":50996,"journal":{"name":"Coastal Engineering","volume":"197 ","pages":"Article 104672"},"PeriodicalIF":4.2,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Forward energy grade line analysis for tsunami inundation mapping","authors":"María F. Estrada ,&nbsp;Rodrigo Cienfuegos ,&nbsp;Alejandro Urrutia ,&nbsp;Patricio A. Catalán ,&nbsp;Patricio Winckler","doi":"10.1016/j.coastaleng.2024.104673","DOIUrl":"10.1016/j.coastaleng.2024.104673","url":null,"abstract":"<div><div>A simplified model using 1D topobathymetric profiles for generating tsunami inundation maps is implemented and evaluated. The approach is a modification of the ASCE Energy Grade Line Analysis, that allows estimation of the maximum inundation distances using an iterative method. The modified methodology is implemented in three coastal cities in central Chile and compared with a database of 5400 full tsunami simulations obtained from a Nonlinear Shallow Water Equations solver. The key parameter of the model is based on the Froude number, for which three parameterizations and a range of values are tested. Results show that errors in the estimation of the areal extent of the inundation can be as low as 4%, after calibration. However, calibration is site specific and the optimal solution depends on the geographical characteristics of the area of interest. A sensitivity analysis based on the aleatoric sampling of the full tsunami simulation database show that as little as 100 inundation maps are required to perform the calibration of the model. This is a manageable number that offers reduced computational costs when compared with full tsunami simulations, and even those required to train other surrogate models using machine learning.</div></div>","PeriodicalId":50996,"journal":{"name":"Coastal Engineering","volume":"197 ","pages":"Article 104673"},"PeriodicalIF":4.2,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Establishment and validation of a versatile SPH-based numerical tank for generating wave-alone, current-alone, and wave-current-combined fields","authors":"Hong-Guan Lyu,&nbsp;Peng-Nan Sun","doi":"10.1016/j.coastaleng.2024.104663","DOIUrl":"10.1016/j.coastaleng.2024.104663","url":null,"abstract":"<div><div>Gravity wave generation, propagation, evolution, and interaction with a current play a key role in coastal and ocean engineering design. Within the Smoothed Particle Hydrodynamics (SPH) framework, this paper presents a versatile meshless numerical tank capable of generating wave-alone, current-alone, and wave–current-combined fields. To this end, the upstream region of the numerical tank is modeled by a so-called Lagrangian particle injector that directly enforces Dirichlet source conditions to generate a desired field. Furthermore, the downstream region of the numerical tank is tackled by deploying a sponge layer in conjunction with an outflow layer to maintain flow consistency during a simulation. Finally, a series of benchmarks and applications are performed to verify and validate the accuracy, convergence, and applicability of the present numerical tank in solving marine hydrodynamics. It is demonstrated that the newly-developed numerical tank is capable of generating accurately different fields widely used in practice in an easy-to-implement manner and hence shows great potential to be a promising alternative to those traditional SPH-based numerical tanks employing a moveable paddle.</div></div>","PeriodicalId":50996,"journal":{"name":"Coastal Engineering","volume":"197 ","pages":"Article 104663"},"PeriodicalIF":4.2,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physical processes explaining the second force peak generated during a surge impact on a vertical wall","authors":"Mohamed Rozki,&nbsp;Stéphane Abadie,&nbsp;Denis Morichon","doi":"10.1016/j.coastaleng.2024.104664","DOIUrl":"10.1016/j.coastaleng.2024.104664","url":null,"abstract":"<div><div>This paper presents an in-depth study of the impact of a surge on a vertical wall using incompressible and compressible RANS model simulations of a classical dam break experiment over a dry bed. The model allows access to the detailed flow structure and pressure field at any instant, which provides valuable complementary information to measurements. Our study focuses on the second force peak, which is often the largest one and for which the literature does not really provide a clear explanation. Before and after this peak, the pressure on the wall is governed by the flow kinematics in the area. Before the peak, an overpressure appears at the root of the reflected jet, corresponding to the violent interaction between the incoming surge and the run-down flow. At the peak instant, the situation suddenly changes, due to the collapse of the reflected jet onto the incoming flow, trapping an air cavity. As in the classical case of direct wave impact on a wall with a trapped air pocket, this process generates an additional strong uniform pressure field in the air cavity, which propagates to the water and nearby boundaries due to the water confinement effect. This compressible effect, which varies depending on the capacity of air to escape the cavity, explains the formation of the second force peak. Finally, the 3D incompressible model provides a much more reliable estimate of the second force peak than the 2D incompressible model. This is likely due to the air escape phenomenon, which occurs when the experimental initial conditions are not perfectly 2D. Although it is unlikely that the 3D simulation perfectly reproduces the experimental flow, nevertheless, with more or less comparable air escape, the computation results appear consistent.</div></div>","PeriodicalId":50996,"journal":{"name":"Coastal Engineering","volume":"197 ","pages":"Article 104664"},"PeriodicalIF":4.2,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A multi-phase SPH model for simulating the floating OWC-breakwater integrated systems","authors":"Yifan Zhang ,&nbsp;Jiapeng Pan ,&nbsp;Mengxia Song ,&nbsp;Haonan Jiang ,&nbsp;Fang He ,&nbsp;Can Huang ,&nbsp;Ahmad Shakibaeinia","doi":"10.1016/j.coastaleng.2024.104658","DOIUrl":"10.1016/j.coastaleng.2024.104658","url":null,"abstract":"<div><div>Oscillating water column (OWC) devices, a type of wave energy converter, have aroused great interest of researchers in the past decades due to their straightforward configuration and superior durability. In this work, an experiment on a fixed bottom-mounted OWC device is first conducted, and then the multi-phase Smoothed Particle Hydrodynamics (SPH) method with the adaptive spacing resolution technology is developed and applied into the simulation of the OWC simulation. In order to calculate the pressure in the chamber of OWC accurately, two improvements are made to the computational model: 1) a modified gas-related far-field boundary condition; 2) particle refinement near the OWC slot. The numerical results agree with the experimental results, indicating an accurate simulation of both the pneumatic and hydrodynamic process in fixed OWC devices. Subsequently, mooring systems and elastic models are validated and then coupled with the multi-phase SPH-OWC. Utilizing the proposed SPH model, a floating OWC-breakwater system with an elastic curtain below is numerically simulated. Results show that the current multi-phase SPH model can be used to investigate hydrodynamic characteristics of complex floating OWC-breakwater systems.</div></div>","PeriodicalId":50996,"journal":{"name":"Coastal Engineering","volume":"197 ","pages":"Article 104658"},"PeriodicalIF":4.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Breaking onset and breaking strength of focused wave packets: Linear prediction model and nonlinear numerical simulations","authors":"Florian Hulin ,&nbsp;Marc Prevosto ,&nbsp;Alan Tassin ,&nbsp;Jean-françois Filipot ,&nbsp;Nicolas Jacques ,&nbsp;Stephan Grilli","doi":"10.1016/j.coastaleng.2024.104660","DOIUrl":"10.1016/j.coastaleng.2024.104660","url":null,"abstract":"<div><div>The possibility of predicting the occurrence of wave breaking and the intensity of the breaking events using linear wave models is investigated. For this purpose, a new linear breaking onset criterion is proposed, based on the definition of a linear-equivalent wave, which has the same energy and impulse as the associated nonlinear wave. The strength of breaking is characterized by the <span><math><mi>Γ</mi></math></span> parameter introduced by Derakhtiet al. (2018) and we derive an empirical law to estimate the breaking strength from the linear-equivalent wave model. The predictive ability of this criterion is assessed through comparisons with results of fully nonlinear potential flow simulations, for focused wave packets of various characteristics. For the considered configurations, the proposed approach is able to predict the onset and strength of breaking with good accuracy.</div></div>","PeriodicalId":50996,"journal":{"name":"Coastal Engineering","volume":"197 ","pages":"Article 104660"},"PeriodicalIF":4.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High fidelity numerical modelling of European brushwood groyne fluid-structure-interaction: Parametrization through Darcy–Forchheimer, reflection and transmission coefficients","authors":"Felix Spröer ,&nbsp;Oliver Lojek ,&nbsp;Christina Bischoff ,&nbsp;Dorothea Bunzel ,&nbsp;Maike Paul ,&nbsp;Nils Goseberg","doi":"10.1016/j.coastaleng.2024.104659","DOIUrl":"10.1016/j.coastaleng.2024.104659","url":null,"abstract":"<div><div>The shoreline retreat of salt marshes and tidal flats due to both accelerated rates of sea level rise (SLR) and altered sediment dynamics as a result of the interlinked impacts of climate change is becoming increasingly visible on a global scale. In particular, salt marsh retreat amplifies pressure on the main coastal protection facilities in areas of coastal squeeze and at the same time leads to the loss of unique biodiverse wetland ecosystems that provide a wide range of key ecosystem services. Salt marshes are generally able to dynamically adapt to SLR through vertical sediment accretion and lateral expansion under hydrodynamically calmed conditions, as long as sufficient sediment budgets are available. However, in areas of little or no foreshore growth, facilitating sufficient sediment accretion is essential to ensure optimal coastal foreshore management. In Northern Europe, brushwood groyne fields used for centuries provide such hydrodynamically calmed settlement spaces that facilitate sediment accretion, yet they are insufficiently investigated and parametrized in regard to their flow-retentive effectiveness. Hence, this study parametrizes European brushwood groynes in the framework of a Darcy–Forchheimer model through a three-dimensional numerical modelling suite within the numerical framework REEF3D:CFD to quantify the fluid–structure interaction of European brushwood groynes systematically. Through validation with an existent laboratory dataset, steady-state current as well as oscillatory wave brushwood groyne interaction is investigated, providing details on flow retention, wave transmissivity and reflectivity. For the first time, laminar and turbulent resistance coefficients of European brushwood groynes are presented that enable the representation of European brushwood groynes in phase-resolved numerical modelling approaches. Furthermore, in-depth wave transmission and reflection coefficients are derived for a vast range of hydrodynamic conditions and numerous relevant brushwood groyne construction variations relevant to coastal protection. The numerical results revealed transmission coefficients in the range of 0.15 to 0.87 and reflection coefficients in the range from 0.17 to 0.73. State of the art and novel parametrized fit-equations are derived from the wave transmission and reflection coefficients, providing readily available tools to estimate European brushwood groyne transmissivity and reflectivity. In turn, this study serves as a first primer for optimizing the design of European brushwood groyne fields and comparable coastal protection structures aimed at facilitating sediment deposition and foreshore stabilization in order to foster the protective capabilities of coastal wetlands and their ecosystem services now and in the future.</div></div>","PeriodicalId":50996,"journal":{"name":"Coastal Engineering","volume":"197 ","pages":"Article 104659"},"PeriodicalIF":4.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}