Establishment of a real-time estimation method for local wave information using wave sounds recorded with an IC recorder

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K21021
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 22:Civil engineering and related fields
• Research Institution: Yokohama National University
• Principal Investigator: Suzuki Takayuki 横浜国立大学, 大学院都市イノベーション研究院, 教授 (90397084)
• Project Period (FY): 2020-07-30 – 2023-03-31
• Keywords: 波高予測 / ICレコーダ / リアルタイム / 相模灘

Outline of Final Research Achievements

The objective of this study is to analyze various wave sounds on land, considering the characteristics of the coastal environment, while aiming to simplify and reduce the cost of measuring wave fields. Wave sound pressure levels were measured at seven locations, including Hazaki Beach in Ibaraki Prefecture and beached in Sagami Bay in Kanagawa Prefecture. The collected data were examined and analyzed. Utilizing the observation results from Hiratsuka Beach, wave height estimation was achieved with an accuracy of R2 = 0.53 by employing wind noise-canceled sound pressure, relative deviation, and air pressure. Moreover, by integrating the findings from simultaneous studies conducted at four other coasts in Sagami Bay, a generalized wave height estimation formula was developed, utilizing the nearshore beach slope and sea bed slope as variables.

Free Research Field

海岸工学

Academic Significance and Societal Importance of the Research Achievements

本研究は海岸に響き渡る波浪音を用いて波高をリアルタイムで推定する内容である．音の観測は陸上で可能であることから，安全に，かつ，計測はICレコーダでおこなうことから容易に実施でき，高波浪時も含めて紛失の恐れもなく，昼夜を問わず計測できる利点がある．今回の検討により，単一海岸のみならず，個々の海岸の勾配を変数にすることで相模灘においては統一的に推定することが示された．他海域での検討は必要であるが，簡易に空間的にも波浪場を推定できることは示され，これは沿岸域の防護や防災面からも本成果の意義は大きいと考える．