ANALYSIS ON MANGROVES DISTRIBUTION CHANGE OVER THE LAST 40 YEARS BY USING RGB IMAGES OF AIRA RIVER MOUTH IN ITIOMOTE ISLAND, JAPAN AND EFFECT BY SEA LEVEL RISE
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- NAKAMURA Wataru
- 東京大学 大学院 新領域創成科学研究科社会文化環境学専攻
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- NAKAMURA Yoshiyuki
- 元横浜国立大学
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- FUJIMOTO Kiyoshi
- 南山大学 総合政策学部
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- SUZUKI Takayuki
- 横浜国立大学 大学院都市イノベーション研究院
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- HIGA Hiroto
- 横浜国立大学 大学院都市イノベーション研究院
Bibliographic Information
- Other Title
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- RGB画像を用いた西表島相良川河口域マングローブ林の過去40年間の分布変化の解析と海面上昇による影響
- RGB ガゾウ オ モチイタ イリオモテジマ サガラガワ カコウイキ マングローブリン ノ カコ 40ネンカン ノ ブンプ ヘンカ ノ カイセキ ト カイメン ジョウショウ ニ ヨル エイキョウ
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Abstract
<p> To analyze the mangroves distribution change in Aira river mouth in Iriomote Island and the effects of sea level rise, the growing ground heights of four mangroves species were measured. As a result of analyzing the tidal observation records in Ishigaki Island, the sea level rise rate was about 2.3 mm/year, and the annual inundation period of the ground height where the tallest mangroves were growing was 3288 hours for A. marina, 2424 hours for S. alba, 2040 hours for R. stylosa, and 1584 hours for B. gymnorhiza. As a result of analyzing the images of Aira river mouth taken in the past, the mangrove forest expanded from 5.24 ha in 1978 to 7.74 ha in 2017, and the R. stylosa forest transitioned to the B. gymnorhiza forest, and the S. alba growing on the tidal flat to the R. stylosa forest. By analyzing the tidal observation records in Ishigaki island and the estimated distribution of mangrove species in Aira river mouth, the sediment accumulation rate of mangrove species in Aira river mouth is about 3.85 mm/year, which is higher than the sea level rise rate of 2.3 mm/year, indicating that the distribution of mangrove species has been expanding.</p>
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) 77 (2), I_925-I_930, 2021
Japan Society of Civil Engineers
