Mechanisms of the interaction among waves, sediment transport and bed evolution around a marine structure and the integrated analysis

2014 Fiscal Year Final Research Report

• Project/Area Number: 24760389
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Hydraulic engineering
• Research Institution: Kanazawa University
• Principal Investigator: UMEDA Shinya 金沢大学, 環境デザイン学系, 准教授 (30313688)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 海岸工学 / 洗掘 / 砂漣 / 底質輸送 / 波 / 移動限界 / 相互作用

Outline of Final Research Achievements

This study investigates the scour process at a slender monopile during various phases of a storm to give a better understanding of scour and backfilling mechanisms. Laboratory experiments were carried out to simulate the scouring effect at a pile by a storm consisting of a succession of seven phases of irregular waves. A numerical model was developed in order to perform simulations of the process of the scour and backfilling around a pile in waves. The initiation of sediment motion under waves was studied to develop a simple empirical model for determining critical Shields parameter and critical velocity of fine sand. Evolutions of vortex ripples and scour around a pile were simulated to demonstrate the effectiveness of the numerical model and empirical model. It was found that the methods has proved useful in understanding of dynamics of small scale bed form (vortex ripples) and middle scale bed form (pile scour).

Free Research Field

水工学