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.
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.
"},{"@language":"ja","@value":"八代海湾奥部では，土砂堆積による浅海化が進んでおり，背後農地の排水不良，樋門の閉塞，海水交換の低下による漁業価値の減少などの問題が生じているとされている．
本研究では，地盤高調査を行い過去の結果との比較を行った．次に干拓による潮流・波浪および土砂の堆積・浸食環境の変化について解析を行った．2024年が最も地盤高が大きく浅海化が進行しており，その年変化率は，1991年～2006年～2024年の時間スケールではほぼ一定であることが分かった．一方，2006年～2018年は他の時期の傾向と異なり浸食傾向であったことから，長期的な堆積傾向ではあるが短期的な変動の影響も大きいことが示された．干拓の影響により，潮流も波高も減少し，本海域が堆積しやすい状況になったことが示された．
"}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410306053352053762","@type":"Researcher","foaf:name":[{"@language":"ja","@value":"田井 明"},{"@language":"en","@value":"TAI Akira"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"福岡工業大学 社会環境学部社会環境学科"}]},{"@id":"https://cir.nii.ac.jp/crid/1410306053352053761","@type":"Researcher","foaf:name":[{"@language":"ja","@value":"小森田 智大"},{"@language":"en","@value":"KOMORITA Tomohiro"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"熊本県立大学 環境共生学部環境資源学専攻"}]},{"@id":"https://cir.nii.ac.jp/crid/1410306053352053760","@type":"Researcher","foaf:name":[{"@language":"ja","@value":"山田 勝雅"},{"@language":"en","@value":"YAMADA Katsumasa"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"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"}]},{"@id":"https://cir.nii.ac.jp/crid/1410306053352053763","@type":"Researcher","foaf:name":[{"@language":"ja","@value":"齋田 倫範"},{"@language":"en","@value":"SAITA Tomonori"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"鹿児島大学 学術研究院理工学域"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"24366021"}],"prism:publicationName":[{"@language":"ja","@value":"土木学会論文集"},{"@language":"en","@value":"Japanese Journal of JSCE"},{"@language":"ja","@value":"土木学会論文集"},{"@language":"en","@value":"Japanese Journal of JSCE"}],"dc:publisher":[{"@language":"en","@value":"Japan Society of Civil Engineers"},{"@language":"ja","@value":"公益社団法人 土木学会"}],"prism:publicationDate":"2025","prism:volume":"81","prism:number":"18","prism:startingPage":"n/a"},"reviewed":"false","url":[{"@id":"https://www.jstage.jst.go.jp/article/jscejj/81/18/81_25-18170/_pdf"}],"availableAt":"2025","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=the%20head%20of%20Yatsushiro%20Sea","dc:title":"the head of Yatsushiro Sea"},{"@id":"https://cir.nii.ac.jp/all?q=sediment%20deposition","dc:title":"sediment deposition"},{"@id":"https://cir.nii.ac.jp/all?q=land%20reclamation","dc:title":"land reclamation"},{"@id":"https://cir.nii.ac.jp/all?q=POM","dc:title":"POM"},{"@id":"https://cir.nii.ac.jp/all?q=SWAN","dc:title":"SWAN"}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360025034138062976","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Effects of tidal flat reclamation on the stability of coastal wetland ecosystem services: A case study in Jiangsu Coast, China"}]},{"@id":"https://cir.nii.ac.jp/crid/1360306506217640192","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Expected changes in the benthic fauna of Wadden Sea tidal flats as a result of sea-level rise or bottom subsidence"}]},{"@id":"https://cir.nii.ac.jp/crid/1360869454561043200","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Where land meets sea: Intertidal areas as key‐habitats for sharks and rays"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001205353982336","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"EECTS ON TIDE, TIDAL CURRENT AND SEDIMENT TRANSPORT BY COASTLINE CHANGE IN HAKATA BAY"},{"@language":"ja","@value":"博多湾の海岸線改変による潮汐・潮流と底質輸送への影響"}]},{"@id":"https://cir.nii.ac.jp/crid/1390009640045156480","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"CHANGE OF PRECIPITATION AND RIVER DISCHARGE IN KYUSHU ISLAND BY GLOBAL WARMING BASED ON LARGE ENSEMBLE EXPERIMENTS"},{"@language":"ja","@value":"気候予測データベースd4PDFに基づく九州地方の降雨及び河川流量の将来変化特性について"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282680328488064","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"内湾浅海域における縣濁物質の応答特性"},{"@language":"en","@value":"RESPONSE CHARACTERISTICS OF SUSPENDED SOLIDS IN NERITIC REGION IN INNER BAY"},{"@language":"ja-Kana","@value":"ナイワンセンカイイキ ニ オケル ケン ダク ブッシツ ノ オウトウ トクセイ"}]}],"dataSourceIdentifier":[{"@type":"JALC","@value":"oai:japanlinkcenter.org:2014648085"},{"@type":"CROSSREF","@value":"10.2208/jscejj.25-18170"}]}