Study on the Process of Damage Gentle-Slope Sea Dike Attacked Severe Wave for Hours Together of Irregular Waves

不规则波浪持续数小时猛烈波浪侵袭缓坡海堤破坏过程研究

基本信息

批准号：
10650512
负责人：
TAKAHASHI Toshihiko
金额：
$ 0.64万
依托单位：
Tohoku Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650512/
关键词：
Gentle-slope sea dike damage irregular wave severe wave experiment beach profile change 波の打ち上げ高さ現地観測被覆ブロック

项目摘要

○ Comparison of the Beach Profile Changes in front of Gentle-Slope Sea Dike for Regular and Irregular WavesBeach profile changes in front of the gentle-slope sea dike and the damage of dike with them were studied experimentally by using the regular and irregular waves. Beach profile changes caused by irregular wave becomes smaller than that by regular wave. It will be considered that the beach profile changes are smoothed in general, because the wave breaking point for irregular wave is different every one wave. In the case of regular wave, although the damage of dike progresses gradually as a time of wave action becomes longer, the damage becomes early with increasing dike slope. On the other, in the case of irregular wave, the damage of dike did not occur within the limits of this experiment.○ Experiments on the Damage of Gentle-Slope Sea Dike Caused by the Piping of Back filling MaterialsThe experimental investigation on the piping of back filling materials which is considered as a cause for damage of gentle-slope sea dike was carried out. The sands or gravels of 5 different grain sizes were used for the back filling materials. From the experiments, two different patterns of damage were observed. One is a damage caused by the piping from the hole of upper blocks than the still water level and another one by the piping from the end of slope after erosion of foundation works. The former occurred for small grain size of back filling materials.

○比较温和的海堤面前海滩轮廓变化的变化，以通过使用常规和不规则的波浪对柔和的海堤面前的常规和不规则的海浪轮廓变化进行了实验研究。由不规则波引起的海滩轮廓变化比常规波浪小。可以认为，海滩轮廓变化通常是平滑的，因为不规则波的波浪断裂点每一个波浪都不同。在常规波浪的情况下，尽管随着波动作用的时间更长的时间，堤防的损害逐渐发展，但随着堤防斜率的增加，损害变得早。另一方面，在不规则波浪的情况下，堤防的损害并未在本实验的范围内发生。○实验是由于背部填充材料的管道损坏而损坏了损坏的柔和斜坡堤防，因此对背部填充材料的管道进行了实验研究，这被认为是损坏温和的海l型海盘损坏的原因。将5种不同晶粒尺寸的沙子或图用于后填充材料。从实验中，观察到两种不同的损害模式。一种是由静止水位的孔的管道造成的损坏，另一个是由静止水位的损坏，另一个是在侵蚀基础作品后从坡度末端的管道造成的。前者是针对背部填充材料的小晶粒尺寸。