Tidal flats are important coastal ecosystems with rich biodiversity and high water-purification capacity and serve as productive habitat substrates for shellfish harvesting and nori cultivation. However, river structures and coastal development have promoted mud deposition and habitat degradation. In this study, we conducted a field experiment applying sand covering with gravel deposited in the Midorikawa Dam lake at the mouth of the Midorikawa River tidal flat, and evaluated effects on ground elevation and the habitat conditions of Ruditapes philippinarum. Six months after covering, elevation remained stable, and both population density and shell-length growth of R. philippinarum increased markedly in sand-covered areas. In particular, using coarse materials improved the habitat environment, showing positive effects on settlement and growth.
"},{"@language":"ja","@value":"干潟は，豊かな生物多様性と高い水質浄化機能を有する重要な沿岸生態系であり，貝類の採取やノリ養殖などの漁業生産の場としても活用されている．しかし，河川構造物や沿岸開発により泥質化や生物生息場の劣化が進行している．本研究では，緑川河口干潟を対象に，緑川ダム湖に堆積した砂礫を用いた覆砂実証実験を実施し，覆砂が地盤高やアサリ個体群の生育環境に及ぼす影響を評価した．得られた結果として，覆砂後半年間，地盤高はおおむね安定して維持され，覆砂区域ではアサリの個体密度および殻長の成長が顕著に促進されることが分かった．特に粗粒材を含む覆砂は，生息環境の改善に寄与し，アサリの定着や成長に好影響を及ぼすことが示された．
"}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410025817053680896","@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/1410025817053680898","@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/1410025817053680897","@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"}]}],"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":"2026","prism:volume":"82","prism:number":"16","prism:startingPage":"n/a"},"reviewed":"false","url":[{"@id":"https://www.jstage.jst.go.jp/article/jscejj/82/16/82_25-16149/_pdf"}],"availableAt":"2026","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=tidal%20flat","dc:title":"tidal flat"},{"@id":"https://cir.nii.ac.jp/all?q=sand%20covering","dc:title":"sand covering"},{"@id":"https://cir.nii.ac.jp/all?q=Ruditapes%20philippinarum","dc:title":"Ruditapes philippinarum"},{"@id":"https://cir.nii.ac.jp/all?q=habitat%20improvement","dc:title":"habitat improvement"},{"@id":"https://cir.nii.ac.jp/all?q=ground%20elevation","dc:title":"ground elevation"}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360870489931651584","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Dynamics of marine sands"}]},{"@id":"https://cir.nii.ac.jp/crid/1361418518380648448","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Bedload Transport of Newly-Settled Juveniles of the Manila ClamRuditapes philippinarumObservedin situat Banzu Tidal Flat, Tokyo Bay"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001204472141440","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Influence of the Development and Destruction of Muddy Byssal Mats Made by a Mytilid Mussel, Musculista senhousia, on Seasonal Fluctuations of the Macrobenthic Community on Sandy Tidal Flats"},{"@language":"ja","@value":"砂質干潟におけるホトトギスガイの泥状のマット形成と基質攪拌によるマット破壊が底生生物群集の季節変動に及ぼす影響"},{"@language":"ja-Kana","@value":"スナシツ ヒガタ ニ オケル ホトトギスガイ ノ デイジョウ ノ マット ケイセイ ト キシツ カクハン ニ ヨル マット ハカイ ガ テイセイ セイブツ グンシュウ ノ キセツ ヘンドウ ニ オヨボス エイキョウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001204473117824","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"有明海・八代海の再生 有明海に面する熊本県の干潟で起きたアサリ漁業の著しい衰退とその原因となる環境変化"},{"@language":"en","@value":"Marked decline of clam harvesting fisheries and environmental changes on the tidal flats facing the Ariake Sea in Kumamoto Prefecture"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282680295459584","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Restoration of Water Environment by Covering Granulated Coal Ash in Brakish-water Lake Nakaumi, Japan"},{"@language":"ja","@value":"石炭灰造粒物覆砂による環境修復効果 - 汽水域をフィールドとして -"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282680329813504","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"地盤環境を考慮したアサリ成育場の新たな維持・管理手法の開発と現地試験による実証"},{"@language":"en","@value":"DEVELOPMENT AND VERIFICATION OF THE NEW MAINTENANCE AND MANAGEMENT METHOD OF NURSERY HABITATS FOR R. philippinarum CONSIDERING GEOENVIRONMENTAL DYNAMICS"}]},{"@id":"https://cir.nii.ac.jp/crid/1391975276378415872","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"REMAINING EFFECTS OF ASARI CLAMS Ruditapes philippinarum ON SPREADED CRUSHED STONES SUBJECT TO OSCILLATORY FLOW"},{"@language":"ja","@value":"振動流下における砕石敷設によるアサリ定位効果の検証"},{"@language":"ja-Kana","@value":"シンドウ リュウカ ニ オケル サイセキ フセツ ニ ヨル アサリ テイイ コウカ ノ ケンショウ"}]}],"dataSourceIdentifier":[{"@type":"JALC","@value":"oai:japanlinkcenter.org:2015015931"},{"@type":"CROSSREF","@value":"10.2208/jscejj.25-16149"}]}