Study on the Effect of Wave Grouping on the Destruction of Offshore Structure

波群对海上结构物破坏的影响研究

• 批准号: 01460184
• 负责人: SAWARAGI Toru
• 金额: $ 2.5万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01460184/
• 关键词: Offshore Structure; Wave Grouping; Rubble Mound Breakwater; Long Wave; Sand Drift; Longshore Current; Run; Moored Vessel; グル-ピング特性; 長周期水位変動; 不規則波; 群波; 波変形; 浮遊式海洋構造物

Sawaragi carried out a series of experiments to investigate the effect of grouping on the stability of rubble mound breakwater. It is found that the critical condition of stability is closely related to the runs of wave height and surf similarity parameter together with the run-length of incident wave energy. A new design formula for the rubble mound breakwater is proposed based on the expected damage rate where the initial slope of the rubble mound and the effect of frictional resistance of rubbles are taken into account. Deguchi and Nochino investigated the characteristics of grouping of measーured wind waves in the fields. Any significant relation can not be found between parameters which represent the property of grouping (eg. run-length or groupiness factor) and those which express the characteristics of the frequency spectrum (eg. peakedness or band-width parameter). However, the probability distribution of wave height became flatter than Rayleigh distribution when waves indicate strongly grouping property. Further, although groupiness become weak in the surf zone, amplitudes of bounded long wave increase toward shoreline which cause low frequency fluctuation in longshore current and mean water surface. Aoki investigated characteristics of oscillation at the grouping frequency in the two oscillation systems, that is, an oscillation of a floating vessel and surface oscillation in a rectangular bay. It is found that the oscillation of rectangular vessel becomes large when the grouping frequency is the same as the natural frequency of the moored vessel. Ono studied the differences of suspended sediment caused by irregular waves and regular waves through experiments and found that the irregular waves have higher diffusivities than the regular waves.

Sawaragi进行了一系列的实验，对瓦砾的稳定性稳定性的稳定性与波浪和冲浪相似性参数共同相关。在磁场中的r块中，任何有意义的都不能在代表（例如ngth或glopiness）的参数之间或带宽的参数）。浮动容器和表面振荡在与系泊船的固有频率相同时，通过不规则的波和常规波。

项目成果

椹木 亨: "港内係留船の波浪動揺特性とその予測" 海岸工学論文集. 37. 711-715 (1990)

Toru Sawaragi：“港口停泊船舶的波浪搅动特征和预测”海岸工程杂志 37. 711-715 (1990)。

椹木 亨: "港内係留船の波浪動揺特性とその予測" 海岸工学論文集,土木学会. 37. 711-715 (1990)

Toru Sawaragi：“港口停泊船舶的波浪运动特征和预测”海岸工程论文，日本土木工程师学会 37. 711-715 (1990)。

Kwon, J.: "On the joint distribution of wave height, period and direction for shallow water waves." Proc. of Coastal Engineering. vol. 36. 148-152 (1989)

Kwon, J.：“关于浅水波的波高、周期和方向的联合分布。”

出口 一郎: "砕波帯内の水平混合係数について" 海岸工学論文集,土木学会. 38. (1991)

出口一郎：“关于破浪带的水平混合系数”，海岸工程论文，日本土木工程师学会38。（1991）。

権正 坤: "浅海域で測定された波高,周期,波向の結合確率分布" 海岸工学論文集. 36. 148-152 (1989)

K. Gonmasa：“浅水中测量的波高、周期和波向的联合概率分布”《海岸工程杂志》36. 148-152 (1989)。