Settling velocity variation caused by porous structure of aggregated particle matter in stratified waters and its effect on distribution of nutrient salts.

2017 Fiscal Year Final Research Report

• Project/Area Number: 26420503
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Hydraulic engineering
• Research Institution: Kagoshima University
• Principal Investigator: SAITA Tomonori 鹿児島大学, 理工学域工学系, 准教授 (80432863)
• Co-Investigator(Kenkyū-buntansha): 橋本 彰博 福岡大学, 工学部, 准教授 (00366387)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: フロキュレーション / フロック / フロック径 / 沈降速度 / フラクタル次元 / 凝集

Outline of Final Research Achievements

In this study, experiments on settling and self-weight consolidation and 2D numerical simulation focused on the effect of a coastal structure on cohesive sediment transports are carried out to figure out a behavior of cohesive sediments in a coastal zone.
As a result of a series of experiments, basic and regional characteristics of settling and self-weight consolidation of fine sediments supplied into major inner bays located to the west coast of Kyushu island are clarified. And it is implied that significant decrease in settling velocity of flocs at pycnocline is possible, which cannot be explained only by a buoyant force acting on primary particles composing flocs.

Free Research Field

環境水理学