Seasonal to decadal morphodynamics in an integrated watershed composed of a steep river and barred coasts
Project/Area Number |
15K06229
|
Research Category |
Grant-in-Aid for Scientific Research (C)
|
Allocation Type | Multi-year Fund |
Section | 一般 |
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)
|
Research Collaborator |
YUHI Masatoshi
KARUNARATHNA Harshinie
|
Project Period (FY) |
2015-04-01 – 2018-03-31
|
Project Status |
Completed (Fiscal Year 2017)
|
Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
|
Keywords | 海岸 / 河口 / 河川 / 底質輸送 / 汀線 / 砂州 / 海岸工学 / 海浜変形 / 河床変動 / 流域 / 砂浜 / 流砂 / 漂砂 / 季節変化 / 波浪 / データ解析 / 数値解析 |
Outline of Final Research Achievements |
Seasonal to decadal variability of shoreline position at a long multi-barred beach with gentle slopes was investigated using a dataset of biannual shoreline surveys of 23 years. EOF and spectral analysis were conducted to describe characteristic patterns of shoreline variation at multiple scales in time and space. A alongshore uniform shoreline migration toward offshore in summer and onshore in winter was dominant in the first EOF mode which secondarily exhibited a long-term trend of shoreline recession. The shoreline pattern reconstructed on a longer time scale represented a large scale shoreline undulation whose scale and migration speed were comparable to shoreline sand waves observed in various coasts. The shoreline pattern reconstructed on a shorter time scale represented alongshore uniform shoreline migration toward onshore and offshore in about five-year cycles, which corresponded to the average cycle of net offshore sandbar migration observed at the site.
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Report
(4 results)
Research Products
(15 results)