Sedimentation process on organic settling matter in brackish lake in cold region

2014 Fiscal Year Final Research Report

• Project/Area Number: 24540466
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Kitami Institute of Technology
• Principal Investigator: KOMAI Katsuaki 北見工業大学, 工学部, 准教授 (90314731)
• Co-Investigator(Kenkyū-buntansha): NAKAYAMA Keisuke 北見工業大学, 工学部, 教授 (60271649) ; NAKASHITA Shinya 広島大学, 大学院工学研究院, 助教 (90613034)
• Co-Investigator(Renkei-kenkyūsha): YOKOYAMA Hiroshi 独立行政法人土木研究所, 寒地土木研究所, 主任研究員 (70442879)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 沈降速度分布 / 解析的推定手法 / 有機懸濁物質 / 有機物質 / ゼータ電位 / 塩分

Outline of Final Research Achievements

Measuring of particle size distribution and modeling of particle settling were conducted, and new analytical method on settling velocity distribution from temporal variation of particle size distribution was proposed. From the results of settling experiment by using clay mineral and dispersing agent, the reliable data were obtained. Settling velocity of lake sediment estimated from the model by using ignition loss and carbon/nitrogen ratio was slightly larger in the east of Hokkaido than in the temperate region. The differences of organic matter and solvent influences settling properties of organic settling matter. In Lake Komuke, the settling velocity distribution of organic settling matters also prominently differs. Settling velocity and flocculation were closely related to organic substance depending on seawater exchange rate in the brackish lake.

Free Research Field

水環境工学