MEASUREMENT OF REFLECTION COEFFICIENT OF SEAWALL IN OMORA BAY

Proceedings of the International Conference on Coastal Engineering

Masahiko Isobe²  Kosuke Kondo¹  Masayuki Akama¹ 

[1] Design and Engineering Department, Penta-Ocean Construction Co., Ltd.;Department of Civil Engineering, Yokohama National University

关键词: Omura Bay;    reflection;    reflection coefficient;    reflection measurement;   

DOI  :  10.9753/icce.v20.%p

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

Field investigations were performed in order to establish the reflecting characteristics of a steel sheet-piling type seawall and two vertical wave-dissipating type seawalls through directional wave measurements of wave reflection systems. A pre-designed line array of several capacitance-type wave gauges was used to measure the wave field just in front of the seawall, and the MMLM (Modified Maximum Likelifood Method) was applied for the calculation of the directional wave spectrum and the reflection coefficient. The estimated directional spectra demonstrated that the MMLM has high resolution power and can sufficiently separate the incident and the reflected wave energies. As a result , it was found that the reflection coefficient of the vertical steel sheet-piling seawall is about 0.9 and is independent of the incident wave conditions, whereas those of the vertical wave-dissipating type seawalls show considerable change in correlation to the incident wave period or the mean water level.

【 授权许可】

Unknown