2018 Fiscal Year Final Research Report
Estimation of longshore sediment flux from remote sensing data
| Project/Area Number |
16K06502
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Hydraulic engineering
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | 漂砂 / リモートセンシング / Xバンドレーダ / SAR / 汀線 |
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| Outline of Final Research Achievements |
Field observations on shoreline variation have been conducted at southern Kashimanada, Ibaraki, Japan. X-band radar is installed at research pier HORS to observe hourly shoreline position of 5 km. Also, shoreline positions of 16 km are extracted from SAR images. Both data are combined by a statistical method which is based on Empirical Orthogonal Function. The processed data set is analyzed by EOF and separated into two major components. One is the most prevailing component which maybe represents on-offshore motion due to seasonal wave variation. The second is maybe the longshore motion which is induced by seasonal variation of wave incidence direction. Latter component is the interest for understanding longshore sediment flux variation. Attempts have been done to correlate this component with longshore wave energy flux, but it was not fully successful. To improve the assessment, effects of current must be included.
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| Free Research Field |
海岸工学
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| Academic Significance and Societal Importance of the Research Achievements |
Xバンドレーダの観測結果を潮汐観測結果と合わせて解析し，汀線位置と前浜勾配の沿岸分布をを自動的に推定するシステムを完成させた．これにより，広域の海岸地形を自動的に収集することが可能となり，モニタリングの効率が向上した．課題は，推定の精度が波浪が大きい時，海浜勾配が非常に緩くなる時に悪くなることへの対応である．
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