Characteristics of response of coastal morphological system in dynamic equilibrium to the change of sea level and wave direction

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H02256
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 22040:Hydroengineering-related
• Research Institution: Kanazawa University
• Principal Investigator: Yuhi Masatoshi 金沢大学, 地球社会基盤学系, 教授 (20262553)
• Co-Investigator(Kenkyū-buntansha): 楳田 真也 金沢大学, 地球社会基盤学系, 教授 (30313688) ; 谷口 健司 金沢大学, 地球社会基盤学系, 教授 (20422321) ; 二宮 順一 金沢大学, 地球社会基盤学系, 准教授 (20748892)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 海浜変形 / 多段砂州 / 漂砂循環系 / 海面上昇 / 波向き変化

Outline of Final Research Achievements

This study examined the influences of future sea-level rise and changes in wave climate induced by global warming. A series of analyses were conducted for the Kaetsu Coast, Ishikawa, Japan, to investigate the characteristics of the large-scale and long-term response of coastal morphology to the relative sea level rise (coastal erosion) and to estimate the influence of the change in wave direction and sea level on the wave transmission, coastal currents, and sediment transport. A series of results were obtained as shown below; (1) The characteristics of the morphological response of a multiple-bar coast to relative sea level change were clarified; (2) The effects of expected future sea-level changes on wave transmission, longshore currents, and sediment transport were estimated in a littoral cell with variations in dominant transport directions; (3) A model was developed that can efficiently estimate the change in wave run-up due to future sea level rise and the change in wave climate.

Free Research Field

海岸工学

Academic Significance and Societal Importance of the Research Achievements

近年，世界各地の海岸において，主に人為的影響により土砂移動のバランスが崩壊した．さらに，地球温暖化に伴う海象変化が長期的に予想されており，順応的海岸管理に資する検討が求められている．本研究の内容は，多段砂州の大規模移動や漂砂方向の反転を伴う複雑な海浜システムにおいて， 将来の海水面上昇や波向き変化に対する応答を推定し，海象変動とそれに伴う地形変化が背後域の波浪災害に及ぼす影響を予測する上で有用な知見，モデルを提示するものである．