DEVELOPMENT OF NEW WAVE OVERTOPPING MODELS FOR SEAWALLS WITH WAVE ABSORBING BLOCKS AND SLOPED SEAWALLS

Author(s):  
Naoto HIGUCHI ◽  
Yoji TANAKA ◽  
Katsuyuki SUZUYAMA ◽  
Hidenori SHIBAKI
Keyword(s):  
New Wave ◽  
2019 ◽  
Vol 75 (2) ◽  
pp. I_145-I_150
Author(s):  
Kazuhiro NAKATANI ◽  
Masaru YAMASHIRO ◽  
Mitsuyoshi KODAMA ◽  
Masahide TAKEDA ◽  
Yoshinosuke KURAHARA ◽  
...  

2012 ◽  
Vol 1 (33) ◽  
pp. 64
Author(s):  
Gosse Jan Steendam ◽  
Yvo Provoost ◽  
Jentsje Van der Meer

In March 2011 new wave overtopping tests have been performed in the Netherlands. In contrast to previous tests the grass cover of this dike was not maintained well, which had significant effect on erosion stability. Additionally, for the first time a pilot test has been made on wave run-up from an asphalt berm onto the grass covered upper slope of the dike. The tested dike sections had a sand core covered by a layer of clay and a grass cover. The objective was to test the erosion stability of seaward and landward slopes for wave overtopping as well as wave run-up. For the wave overtopping also the influence on erodibility of the grass cover caused by obstacles or other elements, which may be present at dikes (stairs, fences), was investigated.


Author(s):  
Yoji Tanaka ◽  
Katsuyuki Suzuyama ◽  
Naoto Higuchi ◽  
Hidenori Shibaki

In a situation where water overflow occurs on the seawalls due to a storm surge, generally it is high waves that cause wave overtopping. However, it is common that overflow and overtopping are modeled as separate phenomena, in a situation where both phenomena occur at the same time, the amount of water exceeding the seawalls may not be evaluated correctly. The purpose of this research is to develop a new wave overtopping model including the water overflow for vertical seawalls. The new overtopping model improved the overtopping model of Goda (Goda, 2008: Goda08 model). Goda08 model was developed to adapt for various seawall forms. Goda (2008) insisted it was more accurate than EurOtop model. Nonetheless, Goda08 model has a problem of overestimation in shallow area. Therefore, we tuned the parameters again. It is difficult to reproduce the situation where the overtopping and overflow occur at the same time in a hydraulic experiment. Consequently, CADMAS-SURF which is based on the 2-dimensional non-compressive fluid using the VOF method was used as an experimental data provider for comparative verification of the model.


2012 ◽  
Vol 1 (33) ◽  
pp. 70 ◽  
Author(s):  
William Veale ◽  
Tomohiro Suzuki ◽  
Toon Verwaest ◽  
Koen Trouw ◽  
Tina Mertens

Wave overtopping tests were performed with a 1:25 physical scale model to determine the optimal geometry for design of new wave return walls at Wenduine, Belgium. Wave overtopping on the shallow foreshore at Wenduine was found to be dominated by low-frequency infragravity waves (f < 0.04 Hz at prototype scale). Mean wave overtopping discharge measured with the physical model compared well with the Van Gent (1999) empirical overtopping equations for shallow foreshores. Physical model tests confirmed that the stilling wave basin concept proposed by Geerearts, et al. (2006) and wave wall parapet concepts of van Doorslaer & De Rouck (2010) were effective at reducing the wave wall height required to meet the tolerable discharge overtopping standards.


Author(s):  
Gosse Jan Steendam ◽  
Jentsje Wouter Van der Meer ◽  
Andre Van Hoven ◽  
Astrid Labrujere

A new Wave Run-up Simulator has been designed, constructed, calibrated and used for testing of the seaward face of dikes. The upper part of dikes or levees often have a clay layer with a grass cover. The new device is able to test the strength of the grass cover under simulation of up-rushing waves for pre-defined storm conditions. The cumulative overload method has been developed to describe the strength of grass covers on the crest and landward side of dikes, for overtopping wave volumes. In essence there is not a lot of difference between the hydraulic load from an overtopping wave volume or from an up-rushing wave. Therefore the hypothesis has been evaluated that the cumulative overload method should also be applicable for up-rushing waves. Tests on a real dike have been used to validate this hypothesis. The main conclusions are that the new Wave Overtopping Simulator works really well, but that the results on testing till so far has not yet been sufficient for a full validation of the method. More research is required. Furthermore, a new technique has been developed to measure the strength of a grass sod on a dike: the grass pulling device. Tests with this device showed that it is possible to measure the critical velocity (= strength) of a grass cover, which is much easier than performing tests with a Wave Run-up or Overtopping Simulator.


2009 ◽  
Vol 56 (2) ◽  
pp. 108-120 ◽  
Author(s):  
Jentsje W. van der Meer ◽  
Hadewych Verhaeghe ◽  
Gosse Jan Steendam

Nature ◽  
2001 ◽  
Author(s):  
Philip Ball
Keyword(s):  

Author(s):  
Alistair Fox

This book investigates the coming-of-age genre as a significant phenomenon in New Zealand’s national cinema, tracing its development from the 1970s to the present day. A preliminary chapter identifies the characteristics of the coming-of-age film as a genre, tracing its evolution and the influence of the French New Wave and European Art Cinema, and speculating on the role of the genre in the output of national cinemas. Through case studies of fifteen significant films, including The God Boy, Sleeping Dogs, The Scarecrow, Vigil, Mauri, An Angel at My Table, Heavenly Creatures, Once Were Warriors, Rain, Whale Rider, In My Father’s Den, 50 Ways of Saying Fabulous, Boy, Mahana, and Hunt for the Wilderpeople, subsequent chapters examine thematic preoccupations of filmmakers such as the impact of repressive belief systems and social codes, the experience of cultural dislocation, the expression of a Māori perspective through an indigenous “Fourth Cinema,” bicultural relationships, and issues of sexual identity, arguing that these films provide a unique insight into the cultural formation of New Zealanders. Given that the majority of films are adaptations of literary sources, the book also explores the dialogue each film conducts with the nation’s literature, showing how the time frame of each film is updated in a way that allows these films to be considered as a register of important cultural shifts that have occurred as New Zealanders have sought to discover their emerging national identity.


2012 ◽  
Vol 9 (4) ◽  
pp. 612-627 ◽  
Author(s):  
Eleni Liarou

The article argues that the working-class realism of post-WWII British television single drama is neither as English nor as white as is often implied. The surviving audiovisual material and written sources (reviews, publicity material, biographies of television writers and directors) reveal ITV's dynamic role in offering a range of views and representations of Britain's black population and their multi-layered relationship with white working-class cultures. By examining this neglected history of postwar British drama, this article argues for more inclusive historiographies of British television and sheds light on the dynamism and diversity of British television culture.


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