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Wave flume

About: Wave flume is a research topic. Over the lifetime, 1627 publications have been published within this topic receiving 23335 citations.


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Journal ArticleDOI
TL;DR: In this paper , the authors developed a FOSS derived model, obtained by independently introducing relevant modifications in the original model SPHERA v.9.0 (RSE SpA) based on the Weakly Compressible Smoothed Particle Hydrodynamics (WCSPH) method.

1 citations

01 Dec 2011
TL;DR: In this paper, an integrated GPS receiver that employed direct and reflected GPS signals for the measurement was introduced, and the results of the RGPS, wave gauge, and staff meter were coincided within 0.5cm ~ 1.0cm differences.
Abstract: The purpose of this study is to use the direct and reflected signals of GPS to determine the patterns of water wave in the water flume, as well as to establish a practicable technique of measuring sea water level. The measurements of (1) water waves in the Super Tank and tranquil water level with steadily descending water level in the Mid-size wave flume of the Tainan Hydraulics Laboratory, National Cheng Kung University, and (2) sea water level in the Tainan An-Ping Harbor, were performed. In this research, an integrated GPS receiver that employed direct and reflected GPS signals for the measurement was introduced. Both RHCP and LHCP antennas were employed to simultaneously receive the L1 and L2 carrier phase of direct and reflected signals. After the data analysis of the GPS observation, the position of signal reflection and the water level of the wave were solved. After improving RGPS positioning procedure, the tranquil water level and the steadily descending of water level observation for one hour were performed, and the results of the RGPS, wave gauge, and staff meter were coincided within 0.5cm ~ 1.0 cm. In the Super Tank, the 60cm amplitude with 5 second/cycle of regular wave was generated. The differences between the reflection heights of this GPS system and the record of wave gauge were almost identical within 90%. In addition, a 6-hour observation of sea water level in An-Pin Harbor indicated that results among the RGPS, tide gauge, and staff meter had only 1.0cm ~ 3.0cm differences.

1 citations

Journal ArticleDOI
TL;DR: In this paper, the authors discuss the effect of altitude on the performance of the human body in terms of its ability to deal with the effects of altitude and its effect on the human brain.
Abstract: (2)捨石および被覆ブロック 捨石は,大きさが均一の単一のDEM粒子として扱う. 一方,被覆ブロックは,ケーソンと同様に複数の粒子で 構成する.ケーソンに適切な揚圧力を作用させるために は,マウンドやブロック層の透水性を考慮する必要があ る.そのため,マウンドおよびブロック構成粒子の存在 位置にも流体の計算点をオーバーラップさせて配置し, マウンドおよびブロック構成粒子に作用する流体力は, 局所流速を用いた抗力によって評価した.抗力係数は, マウンド上に設置したブロックあるいは捨石に流れを作 用させて移動限界を調べる予備計算を実施して決定し た.図-1に,予備計算の模式図を示す.領域右側の水位 を自由流出によってほぼ一定に保ちつつ,流入によって 領域左側の水位を徐々に上昇させることで流速を上げて いく.本研究では,100kgの捨石と35tのブロックを扱う ので,これらをイスバッシュ式に代入すると,それぞれ の移動限界流速,約3.2m/sおよび約7.6m/sが得られる. 図-2に,抗力係数を捨石で1.1,ブロック構成粒子で7.0 とした場合の重心の水平方向変位と作用流速を時系列で 示す.双方ともに概ね移動限界流速近辺で移動が開始し ていることが確認できる. なお,被覆ブロックから流体への作用力は,上記の抗 力の反作用として与えるが,捨石に関しては,Shao (2010)を参考に以下の相互作用項を用いる.

1 citations

Journal ArticleDOI
TL;DR: In this article, the effectiveness of emerged and submerged coastal bio-shields in storm surge protection, a laboratory experiment was carried out in a 22 m long, 0.75 m wide and 0.5 m deep wave flume in the Hydraulics and River Engineering Laboratory of Bangladesh University of Engineering and Technology (BUET).
Abstract: Surges and waves induced by cyclones and other severe storms can cause devastating damage of property and loss of life in coastal areas of Bangladesh. Bio-shield in wetlands can reduce the energy of storm surges and cyclones. To study the effectiveness of emerged and submerged coastal bio-shield in storm surge protection, a laboratory experiment was carried out in a 22 m long, 0.75 m wide and 0.75 m deep wave flume in the Hydraulics and River Engineering Laboratory of Bangladesh University of Engineering and Technology (BUET). Experiments were carried out for investigating the performance of the bio-shields in submerged as well as emerged conditions. Bio-shields were represented by cylindrical bamboo sticks as rigid bio-shield and polyethylene as flexible bio-shield whose diameter was 6 mm. There were a total of 51 experimental runs covering 3 different wave periods of 1.6, 1.8 and 2.0 seconds. Time-series of water surface elevations for vegetated (with bio-shield) and non-vegetated (without bio-shield condition) were compared to identify the influence of bio-shield on wave height reduction. It is found for emerged and submerged conditions of bio-shield that the maximum wave height reductions are 71% and 52% at a location which is 3.5 m away from the embankment for wave periods of 2.0 sec at bio-shield spacing of 50 mm c/c and 25 mm c/c respectively. These reductions of wave heights occur when bio-shield of 2 m width (1 m Rigid + 1 m Flexible) are placed at 4 m distance from the embankment. Hence, the most effective position for maximum wave height reduction by both emerged and submerged bio-shield of 2 m width is 4 m distance from the embankment. It is anticipated that these results will find broad application in coastal management and planning for areas with existing coastal bio-shield as well for bio-shield restoration and establishment efforts.

1 citations

01 Jan 1980
TL;DR: In this article, the performance characteristics of fixed breakwaters and floating breakwaters are discussed and the performance of these breakwaters is analyzed in a laboratory wave flume, and the results show that the breakwaters can handle regular waves well.
Abstract: Transmission of regular waves past fixed breakwaters and floating breakwaters are studied in detail in a laboratory wave flume. The performance characteristics of these breakwaters are presented and discussed.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202331
202284
202165
202069
201964
201859