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dc.contributor.authorKato, Taichien
dc.contributor.authorYamada, Masakien
dc.contributor.authorNaruse, Hajimeen
dc.contributor.authorYuichi, Sakaien
dc.contributor.alternative成瀬, 元ja
dc.date.accessioned2023-11-30T00:47:28Z-
dc.date.available2023-11-30T00:47:28Z-
dc.date.issued2023-11-
dc.identifier.urihttp://hdl.handle.net/2433/286214-
dc.description.abstractCrevasse-splay deposits play an important role in the reconstruction of the magnitude of past flood events and in understanding the behavior of river systems. Despite the extensive studies conducted on the geometry and facies of crevasse-splay deposits, their spatiotemporal developmental processes have remained insufficiently understood. In this study, scaled flume experiments were conducted to study the relationship between the developmental processes of crevasse splays and their characteristics. An experimental flume was set up in a tank to simulate the 2019 Chikuma River flood, Central Japan event. To model the overbank flow, an opening was created on the side of the flume’s wall through which the flow flooded onto a horizontal acrylic plate. The sediment used in the experiments consisted of particles with grain sizes of approximately 0.3 and 0.1 mm, which were determined to be equivalent to bedload gravel and suspended sand in a real-scale river using dimensional analysis. The results of the experi ments revealed three important findings: (1) Crevasse-splay deposits initially developed an asymmetric shape extending downstream of the main river channel but gradually showed a symmetric geometry. The river mainstream initially influenced the direction of the inundation flow, but channel bifurcations after the deposition of the sediment piles later changed the geometry of splays into a more symmetric shape. (2) Crevasse-splay deposits developed in two distinct regions (proximal and distal splay), corresponding to sediment transport by bedload and suspended load, respectively. These two regions are commonly observed in the actual field scale. (3) The original overbank flow was a sheet flow without channels, which caused coarse-grained sediments to be spread over a wide area. Subsequently, the accumulation of coarse sands in the developed channel interiors resulted in the buildup of finer-grained sediments upstream of the proximal splay. Thus, the proximal splay deposits became slightly coarse downstream, whereas they rapidly became fine at the boundary with the distal splay. These findings indicate that the characteristics of crevasse-splay deposits vary with the landform’s development stage, thus providing a basis for interpreting their depositional facies.en
dc.language.isoeng-
dc.publisherSociety for Sedimentary Geologyen
dc.rightsAccepted for publication in [Journal of Sedimentary Research] as of [11 Aug 2023]en
dc.rightsThis is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。en
dc.subjectbedloaden
dc.subjectclastic sedimentsen
dc.subjectcoarse-grained materialsen
dc.subjectexperimental studiesen
dc.subjectflume studiesen
dc.subjectfluvial sedimentationen
dc.subjectgeometryen
dc.subjectmicrofaciesen
dc.subjectoverbank sedimentsen
dc.subjectsedimentationen
dc.subjectsedimentsen
dc.subjectsymmetryen
dc.titleFlume experiments in the development of crevasse-splay deposits: transition from asymmetric-to-symmetric geometryen
dc.typejournal article-
dc.type.niitypeJournal Article-
dc.identifier.jtitleJournal of Sedimentary Researchen
dc.identifier.volume93-
dc.identifier.issue11-
dc.identifier.spage825-
dc.identifier.epage839-
dc.relation.doi10.2110/jsr.2023.029-
dc.textversionauthor-
dcterms.accessRightsopen access-
datacite.awardNumber20H01985-
datacite.awardNumber.urihttps://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20H01985/-
dc.identifier.pissn1527-1404-
dc.identifier.eissn1938-3681-
jpcoar.funderName日本学術振興会ja
jpcoar.awardTitleタービダイトは地震・津波を記録するのか?:深層学習逆解析による解明ja
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