{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1390001205424367232.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.4157/grj1984a.62.2_160"}},{"identifier":{"@type":"NDL_BIB_ID","@value":"3216971"}},{"identifier":{"@type":"URI","@value":"http://id.ndl.go.jp/bib/3216971"}},{"identifier":{"@type":"URI","@value":"https://ndlsearch.ndl.go.jp/books/R000000004-I3216971"}},{"identifier":{"@type":"URI","@value":"https://www.jstage.jst.go.jp/article/grj1984a/62/2/62_2_160/_pdf"}},{"identifier":{"@type":"NAID","@value":"110000521301"}},{"identifier":{"@type":"NAID","@value":"10023994519"}}],"dc:title":[{"@language":"ja","@value":"完新世における砂州地形の発達過程"},{"@language":"en","@value":"Geomorphic Development of Barriers in the Coastal Lowlands during the Holocene"},{"@value":"完新世における砂州地形の発達過程--駿河湾沿岸低地を例として"},{"@language":"ja-Kana","@value":"カン シンセイニ オケル サス チケイ ノ ハッタツ カテイ スルガワン エン"}],"dcterms:alternative":[{"@language":"ja","@value":"駿河湾沿岸低地を例として"},{"@language":"en","@value":"a case study of the lowlands along the Suruga Bay, Central Japan"}],"description":[{"type":"abstract","notation":[{"@language":"en","@value":"Most coastal lowlands in Japan are characterized by the presence of barriers which are elongated sand or gravel ridge complexes usually parallel to the shore. The barriers are considered to have played an important role in the geomorphic evolution of the coastal lowlands during the Holocene.<br> Coastal barriers are classified into “primary” and “secondary” ones. A primary barrier was formed during marine transgression and migrated landward as the sea-level rose. A secondary barrier was formed seaward after the primary barrier had reached its most inland position. A secondary barrier usually develops as a series of beach ridges.<br> Geomorphic evolution of coastal lowlands has been deeply influenced by the Postglacial sea-level change. However, the geomorphic development of coastal lowlands with barriers is still not well understood. In particular, we have not done enough studies on the development of a bay or a drowned valley formed during the Postglacial transgression in the period of the first half of theHolocene.<br> The purpose of this paper is to clarify the geomorphic development of coastal lowlands with barriers in the Holocene by reconstructing the environmental changes of the bays or drowned valleys on the basis of analysis of the fossil foraminiferal assemblages in the bore hole cores. The paper will also examine whether a “primary barrier” existed or not in the course of geomorphic development and how the primary barrier enclosed a bay or a drowned valley.<br> Five coastal lowlands along the Suruga Bay-the Matsuzaki, Kano River, Ukishimagahara, Seishin, and Haibara Lowlands-are studied: all of these lowlands have barriers, and they represent typical coastal lowlands with barriers in Japan.<br> The presence of “primary barriers” is confirmed in the Ukishimagahara and Haibara Lowlands, where large amounts of sediment are supplied and there is space for sedimentation such as an abrasion platform.<br> The enclosing of a bay or a drowned valley by a barrier can be detected in the environmental changes, which appear in the fossil foraminiferal assemblages. The initiation of the enclosure process is indicated by a change in the frequency of Ammonia beccarii forma A, which occurs in a lower salinity environment such as the innermost part of a bay. Therefore Ammonia beccarii forma A is considered to be an indicator of a lower salinity environment, and an increase in its frequency in the fossil foraminiferal assemblages is interpreted as the initial stage of enclosure by a barrier. On the other hand, the absence of foraminifera indicates the final stage of enclosure by a barrier, because recent foraminifera live in the sea or in brackish water.<br> An example of the process of geomorphic enclosure by a barrier at the mouth of a bay or a drowned valley can be summarized as follows:<br> 1. A primary barrier began to form at the time the sea-level was lower, around 8, 000 yr B. P., and migrated landward with the rising of the sea-level.<br> 2. When the rate of sea-level rise decreased, between 7, 000 and 6, 000 yr B. P., the primary barrier reached its innermost position, and thereafter secondary barriers developed in sequence. The primary barrier influenced the sedimentary environment in the bay which was formed inside the barrier, and the bay changed into a lagoon.<br> 3. After the culmination of the Postglacial sea-level rise, the sea-level remained stable or lowered slighty. At this time, the lagoon was completely enclosed by the primary barrier and changed into a swampy area. In the case of the Suruga Bay, the enclosure was completed between 6, 000 and 5, 000 yrB. P.<br> 4. The secondary barriers episodically prograded seaward. Along the Suruga Bay, they completely enclosed the backswamps in two periods, from 5, 000 to 4, 000 yr B. P. and from 3, 000 to 2, 000 yr B.P."},{"@language":"ja","@value":"本稿では,砂州地形をもつ海岸低地の完新世における発達過程を明らかにすることを目的とした.砂州地形の代表例がみられる駿河湾沿岸の5つの低地を対象とし,海成層中の有孔虫解析によって復元した内湾の堆積環境変化から,従来十分には把握されていなかった完新世前半の海面上昇期における低地の発達過程を復元した.<br> その結果,海面上昇期に起源をもつ砂州地形の存在が確認されるとともに,有孔虫化石群集の変遷から,砂州地形による内湾の閉塞過程が明確になった."}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420001326229179264","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"20239065"},{"@type":"NRID","@value":"1000020239065"},{"@type":"NRID","@value":"9000283650950"},{"@type":"NRID","@value":"9000006560797"},{"@type":"NRID","@value":"9000285490048"},{"@type":"NRID","@value":"9000002496813"},{"@type":"NRID","@value":"9000321610495"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0190816"}],"foaf:name":[{"@language":"ja","@value":"松原 彰子"},{"@language":"en","@value":"MATSUBARA Akiko"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Research Student, University of Tokyo."},{"@language":"ja","@value":"東京大学研究生"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00167444"},{"@type":"EISSN","@value":"21851735"},{"@type":"NDL_BIB_ID","@value":"000000040430"},{"@type":"ISSN","@value":"00167444"},{"@type":"LISSN","@value":"00167444"},{"@type":"NCID","@value":"AN1016484X"}],"prism:publicationName":[{"@language":"en","@value":"Geographical Review of Japa,. Ser. A, Chirigaku Hyoron"},{"@value":"地理学評論 Ser. A"},{"@language":"en","@value":"Geogr. Rev. Jpn, Ser. A, Chirigaku Hyoron"},{"@value":"地理評 (Ser. A)"}],"dc:publisher":[{"@language":"en","@value":"The Association of Japanese Geographers"},{"@language":"ja","@value":"公益社団法人 日本地理学会"}],"prism:publicationDate":"1989","prism:volume":"62","prism:number":"2","prism:startingPage":"160","prism:endingPage":"183"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","url":[{"@id":"http://id.ndl.go.jp/bib/3216971"},{"@id":"https://ndlsearch.ndl.go.jp/books/R000000004-I3216971"},{"@id":"https://www.jstage.jst.go.jp/article/grj1984a/62/2/62_2_160/_pdf"},{"@id":"https://jlc.jst.go.jp/DN/JALC/10013341960?from=CiNii"}],"availableAt":"1989","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=coastal%20lowland","dc:title":"coastal lowland"},{"@id":"https://cir.nii.ac.jp/all?q=Holocene","dc:title":"Holocene"},{"@id":"https://cir.nii.ac.jp/all?q=%E2%80%9Cprimary%20barrier%E2%80%9D","dc:title":"“primary barrier”"},{"@id":"https://cir.nii.ac.jp/all?q=Suruga%20Bay","dc:title":"Suruga Bay"},{"@id":"https://cir.nii.ac.jp/all?q=foraminifera","dc:title":"foraminifera"}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360574095739594752","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Specification of a Soon-to-Occur Seismic Faulting in the Tokai District, Central Japan, Based Upon Seismotectonics"}]},{"@id":"https://cir.nii.ac.jp/crid/1360855568502366720","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"REGIONAL FORAMINIFERAL ASSEMBLAGES IN TANABE BAY, KII PENINSULA, CENTRAL JAPAN"}]},{"@id":"https://cir.nii.ac.jp/crid/1362544419094830848","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"The Foraminifera of the tropical Pacific collections of the Albatross , 1899-1900 pt. 3: Heterohelicidae and 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