2009 Fiscal Year Final Research Report
Investigations of Sea Spray Icing on Lighthouses and Ice Adhesion Tests on Hydrophilic and Hydrophobic Pliable Polymer Sheets for Protection against Sea Spray Icing
| Project/Area Number |
19310119
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Natural disaster science
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| Research Institution | Hokkaido University of Education |
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Principal Investigator |
OZEKI Toshihiro Hokkaido University of Education, 教育学部, 准教授 (20301947)
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| Co-Investigator(Kenkyū-buntansha) |
KOSE Katsumi 筑波大学, 数理物質科学研究科, 教授 (60186690)
IZUMIYAMA Koh 独立行政法人海上技術安全研究所, 流体部門氷海技術研究グループ, グループ長 (40358403)
NOUJOU Ayumu 北海道教育大学, 教育学部, 准教授 (20311524)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 海洋物理・陸水学 / 自然災害 / 着氷 / 可視化 / 構造・機能材料 |
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| Research Abstract |
Heavy sea spray icing on lighthouses severely affects their maintenance in the northern harbors that face the Sea of Japan. We tested hydrophilic and hydrophobic pliable sheets that can be used to wrap small lighthouses.
We investigated the wet growth of spray ice through a cold experiment conducted using an ice model basin. Experiments were conducted to reveal the sea spray icing characteristics of hydrophobic and hydrophilic surfaces. Deicing was easy for the both pliable sheets due to the low adhesion strength of saline ice and the exfoliation. Field observation was carried out using two dummy lighthouses built on the breakwater. We developed a method employing static ropes in order to withstand the fluttering and green water through one entire winter. The effect of the high hydrophilic sheet was verified using growth rate of sea spray icing. In the case of sea spray ice, the high hydrophilic surface worked effectively because of the low adhesion strength of saline ice.
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