China
Africa
Explore chapters and articles related to this topic
Spectral analysis of group waves run-up
Published in Zhao-Yin Wang, Shi-Xiong Hu, Stochastic Hydraulics 2000, 2020
Zheng Jinhai, Yan Yixin, Qu Yonggang
Wave run-up on coastal structures, such as seawalls, dykes, surge barriers and so on, is an important factor in the design of structures. Besides, the height of wave run-up is the limit of on-shore side for on-offshre and littoral sand transports. There are mainly two ways to analyze the characteristics of wave run-up. One is the individual wave run-up analysis, the other is the spectral analysis. From the engineering viewpoint, such as to determine the heights of coastal structures, the individual run-up wave analysis is preferable, because frequency distributions or extreme statistics of individual run-up wave heights are required. The spectral analysis is employed to investigate the dynamic response between the incident waves and the run-up variations and the spectral characteristics of run-up variations themselves (Mase H.,1988). Compared with studies and conclusions on the run-up of monochromatic waves (Xue Hongchao et al., 1991), there are few studies which discussed group waves and little understandings about their run-up properties. However, model tests of three different wave patterns to investigate their run-up and run-down on the permeable and impermeable slopes and the stability of dolos armour have demonstrated a significant influence of the succession of waves on coastal structures. Also a conclusion of strongly grouped waves are more critical than regular wave was reached (Burcharth H., 1979).
Numerical study of turbulence overtopping and erosion
Published in Lin Li, Farshad Amini, Yi Pan, Saiyu Yuan, Bora Cetin, Hydraulics of Levee Overtopping, 2020
Lin Li, Farshad Amini, Yi Pan, Saiyu Yuan, Bora Cetin
Numerical models are often employed to fill the gaps that physical models have due to the limitations of instruments. In recent years, the increase in computational power has enabled researchers to develop complicated numerical models to simulate the hydrodynamics of wave overtopping. Many models have been developed to simulate wave run-up and wave overtopping based on the nonlinear shallow water equations (Titov and Synolakis 1995; Lin and Liu 1999; Hubbard and Dodd 2002; Reeve et al. 2008; Yuan et al. 2014, 2015b). Lin and Liu (1999) employed a two-dimensional (2D) numerical model, which was a combination of a modified version of RIPPLE and a k-ε model to study wave overtopping above a seawall protected by a porous armor layer. Reeve et al. (2008) studied the effects of combined wave overtopping and storm surge overflow discharge on an earthen levee in a numerical flume by applying a modified model of Lin and Liu (1999). It expanded this model to three dimensions to solve complex free surface (Lin and Xu 2006). Reeve et al. (2008) used experimental data results from Soliman and Reeve (2004) to verify the numerical model, and developed empirical overtopping discharge formulas for combined wave overtopping and storm surge overflow. While Reeve et al. (2008) studied the combined waver overtopping and storm surge overflow, there is very limited information about the effect of combined wave overtopping and storm surge overflow on the HPTRM-strengthened levee on the toe of landward-side slope in particular.
Wave run-up influenced by the protective facings of the sloping breakwater
Published in Guojun Hong, Gongxun Liu, Liquan Xie, Hydraulic Engineering V, 2018
T.T. Sun, D.T. Wang, Q.J. Liu, V. Penchev
Wave run-up has a significant effect on coastal erosion, scouring, siltation, sediment transport, and seawall safety. The influence factors of wave run-up on the sloping breakwater is complex, mainly including the incident wave elements, such as wave height, wave length, wave steepness, and wave period; direction of incident wave; wind speed and direction, platform properties of complex slope; slope roughness and seepage properties; and the slope of the breakwater. Because the sloping breakwater has many types of cross-sectional forms, such as single slope and compound section with platform, research results with different application conditions are obtained. Literature review shows that systematic studies on the wave run-up influenced by the protective facings of the sloping breakwater are relatively few.
Flared front pile supported breakwater in oblique waves
Published in ISH Journal of Hydraulic Engineering, 2023
Jemi Jeya T.J, Sriram V, Sundar V
The run-up over the model is obtained by evaluating the shoreward height of measured wave run-up from the run-up meter fixed either side over the structure and normalized by measured incident wave height. Although, the run-up for each of the models was measured at its two extreme ends, as the crest elevation of the structure is decided on the maximum run-up the maximum registered between them are herein presented. The variations of dimensionless run-up by Ru = (Ru)max/Hi with ka and d/L for FPSB are compared with the VPSB model exposed to different angles of wave attacks for d/h = 1.43 and 1.57 in Figure 8.
Experimental study on wave-structure interaction of an offshore intake well with a curtain wall
Published in Ships and Offshore Structures, 2021
V. Prabu kumar, R. Sundaravadivelu, K. Murali
The wave run-up is an essential phenomenon in the external hydrodynamics of the offshore structures. The wave uprush known as wave run-up induces local impact force on the top deck of the structure and may lead to localised damage. Moreover, the safe clearance between the top deck and the sub-structure is decided by considering the maximum wave run-up value recorded during a continuous-wave attack.
A numerical model for predicting waves run-up on coastal areas
Published in Coastal Engineering Journal, 2023
Hasan Karjoun, Abdelaziz Beljadid
Coastal areas involve several complex natural processes such as surface flows, sediment transport, soil erosion, and moving shorelines. The propagation of waves on coastal areas near urban zones can have negative environmental impacts and cause considerable damages (Clare, Piggott, and Cotter 2022; Ko and Lynett 2019; Satake 2005). Understanding the dynamics of flow waves and predict its effects on coastal areas is necessary for developing solutions for sustainable water management and reducing water-related hazard including environment risks. Coastal wave propagation is mainly affected by the complex geometry of nearshore zones and the bottom topography. The rugged topography can cause many wave transformations such as wave refraction, diffraction, and breaking as the wave approaches the shoreline (Afzal and Kumar 2022; Guo and Chen 2012; Xie and Stoesser 2020). Wave run-up at the coastline is mainly depends on the offshore wave conditions such as height, length, and velocity of waves and on the coastal geometry and topography (Dodet et al. 2018). Several previous studies have been devoted to predict waves propagation and determine the height of run-up along the coastlines (Bellotti 2020; Delis, Kazolea, and Kampanis 2008; Dodd 1998; Domnguez et al. 2019; Farhadi, Emdad, and Rad 2015; Gedik, Irtem, and Kabdasli 2006; Liu et al. 2011; Uda et al. 1988; Varing et al. 2021; von Häfen et al. 2022; Wu, Higuera, and Liu 2021; Zhu et al. 2017). Synolakis (1986, 1987) performed theoretical and experimental studies to analyze the evolution of non-breaking and breaking solitary waves and approximated the wave maximum run-up, as well as the breaking criterion when the wave climbs up the sloping beach. Madsen and Mei (1969) investigated the transformation of the solitary wave over an uneven bottom topography and showed that the wave height rises depending on the slope and its initial height. Tang et al. (2013) used nonlinear shallow water equations to investigate the vegetation damping effects on solitary wave run-up. Kaplan (1955) studied the evolution of periodic waves and derived an empirical formula for wave maximum run-up over a sloping beach.