{"created":"2023-05-15T16:29:25.755350+00:00","id":171,"links":{},"metadata":{"_buckets":{"deposit":"c91448ce-a704-4cee-8403-5f49a01a433e"},"_deposit":{"created_by":2,"id":"171","owners":[2],"pid":{"revision_id":0,"type":"depid","value":"171"},"status":"published"},"_oai":{"id":"oai:nagasaki-u.repo.nii.ac.jp:00000171","sets":["52:56"]},"author_link":["849","850","848"],"item_2_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2019-05-13","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"7","bibliographicPageEnd":"672","bibliographicPageStart":"669","bibliographicVolumeNumber":"47","bibliographic_titles":[{"bibliographic_title":"Geology"}]}]},"item_2_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Grade, a fundamental concept in river geology and geomorphology, refers to a long-term sediment balance that is accompanied by zero net deposition and erosion.\n Recent physical and theoretical modeling proposed the notion that downstream alluvial rivers can autogenically attain grade only in a particular set\n of environmental conditions that include a constant fall of relative sea level. We here make the first successful identification of an autogenic grade system \nin the geological record: the late Holocene Mekong River delta, Vietnam. From 3.5 ka to subrecent, the record of the delta exhibits peculiar features, \nincluding (1) no trace of significant sediment accumulation and erosion on the delta plain surface, (2) a delta plain surface with the same slope as the underlying shelf surface, \n(3) distributary channels that are stabilized in transverse directions but extend linearly basinward, and (4) a delta set thickness that matches a theoretical value.These features in combination are indicative of autogenic grade. Coastal dispersal of river-derived sediment by tides, waves, and ocean currents, \nas well as tectonic features and mangrove vegetation, may have contributed to the attainment and maintenance of grade. Ongoing drastic changes in sea level and human activities have caused the downstream Mekong River to become ungraded and unstable with a much higher risk of channel avulsion and shifting than in the past.","subitem_description_type":"Abstract"}]},"item_2_description_63":{"attribute_name":"引用","attribute_value_mlt":[{"subitem_description":"Geology, 47(7), pp.669-672; 2019","subitem_description_type":"Other"}]},"item_2_publisher_33":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"Geological Society of America"}]},"item_2_relation_12":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type":"isVersionOf","subitem_relation_type_id":{"subitem_relation_type_id_text":"10.1130/G45872.1","subitem_relation_type_select":"DOI"}}]},"item_2_rights_13":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"c 2019 Geological Society of America. All Geology, GSA Bulletin, and GSA Books manuscripts may be published under the terms of Green Open Access."}]},"item_2_source_id_7":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"00917613","subitem_source_identifier_type":"ISSN"}]},"item_2_version_type_16":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_ab4af688f83e57aa","subitem_version_type":"AM"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Wang, Junhui"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Tamura, Toru"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Muto, Tetsuji"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2020-12-18"}],"displaytype":"detail","filename":"Geology47_669.pdf","filesize":[{"value":"4.2 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"Geology47_669.pdf","url":"https://nagasaki-u.repo.nii.ac.jp/record/171/files/Geology47_669.pdf"},"version_id":"a1743b1f-25bd-4227-b0ad-b4e32702e0f2"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Construction and destruction of an autogenic grade system: The late Holocene Mekong River delta, Vietnam","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Construction and destruction of an autogenic grade system: The late Holocene Mekong River delta, Vietnam"}]},"item_type_id":"2","owner":"2","path":["56"],"pubdate":{"attribute_name":"公開日","attribute_value":"2020-05-13"},"publish_date":"2020-05-13","publish_status":"0","recid":"171","relation_version_is_last":true,"title":["Construction and destruction of an autogenic grade system: The late Holocene Mekong River delta, Vietnam"],"weko_creator_id":"2","weko_shared_id":-1},"updated":"2023-05-16T04:20:45.839721+00:00"}