EVALUATIONS OF THE IMPACTS OF RECENT SEAFLOOR ELEVATION CHANGES AND LAND RECLAMATION IN THE NORTHERN YATSUSHIRO SEA

DOI Web Site 6 References
  • TAI Akira
    福岡工業大学 社会環境学部社会環境学科
  • KOMORITA Tomohiro
    熊本県立大学 環境共生学部環境資源学専攻
  • YAMADA Katsumasa
    熊本大学 くまもと水循環・減災研究教育センター合津マリンステーション
  • SAITA Tomonori
    鹿児島大学 学術研究院理工学域

Bibliographic Information

Other Title
  • 八代海北部海域の近年の地盤高変化と海岸線改変による影響の評価
Published
2025
DOI
  • 10.2208/jscejj.25-18170
Publisher
Japan Society of Civil Engineers

Description

<p> At the head of Yatsushiro Sea, shallowing due to sediment deposition has been progressing, leading to several problems such as poor drainage in the adjacent agricultural lands, blockage of sluice gates, and a decline in fishery value caused by reduced seawater exchange.</p><p> In this study, ground elevation surveys were conducted and compared with historical data. Subsequently, changes in tidal currents, wave conditions, and sedimentation/erosion environments due to land reclamation were analyzed. The results showed that in 2024, ground elevation reached its highest level, indicating significant progress in shallowing. The annual rate of change remained almost constant over the periods from 1991 to 2008 and from 2008 to 2024. In contrast, the period from 2006 to 2018 showed a trend of erosion, which deviated from the other periods. The analysis demonstrated that both tidal currents and wave heights decreased due to the effects of land reclamation, creating conditions more favorable for sediment deposition in the study area.</p>

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