LONG-TERM ANALYSIS ON GROUND ELEVATION CHANGE OF TIDAL FLAT USING WATER LEVEL IN RIVER MOUTH AT LOW TIDES
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- OHTSUKI Kazuaki
- Tokyo University of Science
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- NIHEI Yasuo
- Tokyo University of Science
Bibliographic Information
- Other Title
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- 干潮時河川水位に基づく干潟地盤高の長期変動トレンドの検討
- カンチョウジ カセン スイイ ニ モトズク ヒガタ ジバン ダカ ノ チョウキ ヘンドウ トレンド ノ ケントウ
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Abstract
This study is to evaluate the long-term evolution of morphological changes in tidal flat focusing on a characteristic of water level changes at river mouth, where the water level is distorted and separate against tidal level during ebb tide. For the estimation relationships between the elevation change and parameters representing the water level characteristics, two-dimensional current models are developed and the relationships were applied to the field observation data. As a result, we found the elevation decreased from 60's to 90's and slightly increased from around 2005. The estimated changes of sediment volume on the tidal flat clearly corresponded to the sediment losing rate by dam trapping and sand mining with about 10 years delay.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 71 (2), I_631-I_636, 2015
Japan Society of Civil Engineers