Conversion Ratio of Wind Velocity From Prototype to Experimental Model on Wave-Overtopping

Yamashiro, Masaru; Yoshida, Akinori; Hashimoto, Hiroki; Irie, Isao

doi:10.1142/9789812709554_0398

Cited by 4 publications

(4 citation statements)

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“…The main problem concerning hydraulic models is the scale effect. According to Yamashiro et al (2006), the scale factor for wind velocity effects modeling should not be less than 1/3. However, most performed experiments use models scaled on a range of 1/10 to 1/45.…”

Section: Literature Reviewmentioning

confidence: 99%

Wave Run-Ups and Overtopping Affected by Oblique Wave Approaches and Currents

Špano

Bornschein²,

Pohl

et al. 2022

Slovak Journal of Civil Engineering

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To quantify the effect of a current on the height of a wave’s run-up and overtopping combined with an oblique wave approach, the “FlowDike” hydraulic research project was carried out. Tests were performed on two dike slopes of 1:3 and 1:6. Waves were generated across (perpendicular to) the physical model and also inclined in-plane to the stream axis. Oblique waves were generated both towards and along the flow’s direction. The effect of the current and of the wave direction on the height of the wave run-up and amount of the wave overtopping was expressed by means of a combined correction factor for the wave’s inclination and flow velocity. The results of the research confirmed that the flow velocity had only a small effect.

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Section: Literature Reviewmentioning

confidence: 99%

Wave Run-Ups and Overtopping Affected by Oblique Wave Approaches and Currents

Špano

Bornschein²,

Pohl

et al. 2022

Slovak Journal of Civil Engineering

View full text Add to dashboard Cite

show abstract

“…The main problem for hydraulic models is the scale effect. According to Yamashiro et al (2006) the scale factor for wind velocity should not be less than 1/3, while most experiments are scaled within the range of 1/10 to 1/45. In practice, the effect of strong wind should be taken into account during the design process.…”

Section: Literature Reviewmentioning

confidence: 99%

The Influence of Current on the Height of Wind Wave Run-Up: A comparison of experimental results with the Czech National Standard

Říha¹,

Špano²

2012

Journal of Hydrology and Hydromechanics

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One of the basic questions related to the safety of dikes and river levees is the size of the freeboard. One of the important parameters for freeboard design is the height of waves and wave run-up on levee slopes. Routine and standardised calculations of wave run-up deal with the freeboards of dams where wind waves originate on the still water of the reservoir. In the case of running water in streams (thereinafter only "currents") the effect of wave and current interaction on wave run-up is usually not taken into account due to the lack of reliable knowledge regarding the phenomenon. In the Czech Republic this question is topical in the case of large rivers such as the Elbe, the Vltava and the Morava. Within the framework of the projects Hydralab III and NAZV QI 92A139, hydraulic research and further analysis focused on wave run-up as a result of the combination of current and wind wave parameters were performed. The laboratory research was carried out in a hydraulic flume with a wavemaker on the right bank and a levee with a slope of 1:3 installed on the left bank opposite the wavemaker. Waves were generated both perpendicular and oblique to the levee axis; the angle of oblique wave attack varied within the range of ± 30°. The aim of this paper is to compare the results of the mentioned research with recommendations mentioned in the Czech National Standard CSN 75 0255 Calculation of wave effects on water structures and to quantify the effect of current on the wave run-up height. Jednou ze základních otázek spojených s bezpečností hráze je návrh převýšení její koruny nad maximální hladinou vzdouvané vody. Důležitým parametrem ovlivňujícím návrh převýšení je výška vln vybíhajících po svahu hráze. Běžné postupy výpočtu výšky výběhu vlny na svah jsou realizovány za předpokladu, že vlny vznikají na stojatých vodách. Vliv proudění se obvykle vzhledem k nízké úrovni znalostí tohoto jevu na tekoucích vodách zanedbává. V podmínkách České Republiky je otázka vlivu proudění na výšku výběhu relevantní zejména na velkých tocích jako Labe, Vltava nebo Morava. V rámci projektů Hydralab III a NAZV QI 92A139 byl uskutečněn hydraulický výzkum a analýza dat se speciálním zaměřením na výšku výběhu větrových vln při započtení vlivu proudění. Výzkum byl realizován na modelu hráze se sklonem svahu 1 : 3, který byl umístěn ve zkušební nádrži osazené vlnoproduktorem vedeným rovnoběžně s modelem hráze. Vlny zde byly generovány jednak kolmo vzhledem k podélné ose hráze, jednak šikmo v rozsahu úhlů ± 30°. Výsledky výzkumu byly porovnány s doporučeními uvedenými v České státní normě ČSN 75 0255 Výpočet účinků vln na stavby na vodních nádržích a zdržích.KLÍČOVÁ SLOVA: ochranná hráz, hrázka, větrová vlna, výška vlny, výběh vlny, proudění, návrh převýšení.

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“…Therefore, one of the most important problems with the reproduction of prototype storms in small scale is the unknown effect and scaling procedure of the wind field. Yamashiro et al (2006) performed model test in scale 1:45 with reproduction of prototype measurements from Fukuda et al (1974). The model tests were performed in a wind-wave facility.…”

Section: Prototype Measurements and The Effect Of Windmentioning

confidence: 99%

“…However, Geeraerts could not quantify the corresponding prototype wind speed. If the rule of thumb by Yamashiro et al (2006) is applied for the Zeebrugge case the wind speeds are absolutely realistic and thus the wind alone might explain most of the observed differences on overtopping.…”

Section: Prototype Measurements and The Effect Of Windmentioning

confidence: 99%