{"created":"2023-07-27T06:44:38.338239+00:00","id":34934,"links":{},"metadata":{"_buckets":{"deposit":"29a130d3-2bf0-4a99-b23d-2f9463992051"},"_deposit":{"created_by":3,"id":"34934","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"34934"},"status":"published"},"_oai":{"id":"oai:kanazawa-u.repo.nii.ac.jp:00034934","sets":["2812:2813:2845"]},"author_link":["92299","9906"],"item_9_biblio_info_8":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1989-03-01","bibliographicIssueDateType":"Issued"},"bibliographicPageStart":"64p.","bibliographicVolumeNumber":"1987-1988","bibliographic_titles":[{"bibliographic_title":"昭和63(1988)年度 科学研究費補助金 一般研究(B) 研究成果報告書"},{"bibliographic_title":"1988 Fiscal Year Final Research Report","bibliographic_titleLang":"en"}]}]},"item_9_creator_33":{"attribute_name":"著者別表示","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{}],"nameIdentifiers":[{},{}]}]},"item_9_description_21":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"河口においてはしばしば河川流砂と海岸漂砂の相互作用により、河口砂州が発達・変形し、それが河川の洪水疎通能に大きく影響するため、河口砂州のこうした時間変形過程を適切に記述・予測するモデルが要求される。モデル構築のためには、河川流砂、海岸漂砂の運動機構を適確に把握する必要があるが、一般的にみて、比較的一次元的、定常的な河川流砂に比べ、海岸漂砂の簡便な表示が難しいし、その機構も必ずしも明解には明らかにされていない。そこで、まず、河口地形に最も貢献すると考えられる岸沖方向漂砂が実験的に調べられ、その向きはアーセル数によって支配されるものの量としては、シールズ数を用いて、ほぼ河川流砂と相似な関数形、すなわち、限界シールズ数を用い、シールズ数が充分大きい時はほぼその3/2乗で流砂量が増加する形で表現されることが明らかにされた。しかしながら波浪特性とシールズ数は、河川流量とシールズ数のように単純には結びつけられず、そのため、底面流速を媒介に、リニアフィルター法による関連づけの適用性を明らかにした。 上述のような基礎的知見をべースに、次に、河口砂州の変形特性を従来の現地河川実測資料をもとに調べ、とくに河口水深の大きい、そして導流堤のような付属構造物の無い場合では、側岸侵食型で現象が進行することを示し、これを簡略モデル化した一次元解析の基礎式を誘導した。河川、海岸流砂量関数の簡単な関数形を用い、基礎式が非線型ながら解析解の容易に得られる形まで近似表現した結果、いわゆる緩和過程を表わす式を得、一定の外力のもとでは、平衡河口断面が主要なパラメータとして集約できることを示した。これにもとづき、従来の現地河川実測資料より、平衡河口断面についての検討を行い、逆にそれを用いて河口砂州の変形モデルのパラメータを推測することができた。","subitem_description_type":"Abstract"},{"subitem_description":"At river mouth, sand bar is often formed due to interaction of sediment transport by river flow and that by waves, and it affects the flow capacity of the river severely. Hence, an appropiate modelling of deformation process of sand bar at river mouth is required from the view point of river engineering.\nAs for sediment transport in rivers, effect of unsteadiness and non-uniformity of flow on sediment transport is in particular interesting, and thus a non-eguilibrium transport law has been established to describe transient process of sediment transport under such unsteady nonuniform conditions.\nSediment transport by weves is more complicated, but somewhat simplified modelling is required for modelling variation process of river morphology at river mouth. Based on laboratory studies, Ursell number is used to predict the direction of sediment transport, and transport discharge formula using Shields number has been proposed, which is quite similar to that established in river region. In order to evaluate the relation between Shields parameter and the characteristics of waves, applicability of a linear filter method is tested.\nA relaxation model is proposed to descride deformation process of sand bars at river mouth totally, in which equilibrium section of river mouth is used as a parameter instead of complicated parameters related to transport capacity of flow and waves. Based on the field data of actual rivers, the applicability of the present analytical model for deformation process of sand hars has been inspected.","subitem_description_type":"Abstract"}]},"item_9_description_22":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"研究課題/領域番号:62460160, 研究期間(年度):1987–1988","subitem_description_type":"Other"},{"subitem_description":"出典：「河口砂州の発達と変形に関する研究」研究成果報告書　課題番号62460160\n  (KAKEN：科学研究費助成事業データベース（国立情報学研究所）)\n　　　本文データは著者版報告書より作成","subitem_description_type":"Other"}]},"item_9_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.24517/00034921","subitem_identifier_reg_type":"JaLC"}]},"item_9_publisher_17":{"attribute_name":"公開者","attribute_value_mlt":[{"subitem_publisher":"金沢大学工学部"}]},"item_9_relation_28":{"attribute_name":"関連URI","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/search/?qm=70026269","subitem_relation_type_select":"URI"}},{"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62460160/","subitem_relation_type_select":"URI"}},{"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-62460160/624601601988kenkyu_seika_hokoku_gaiyo/","subitem_relation_type_select":"URI"}}]},"item_9_version_type_25":{"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_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-10-05"}],"displaytype":"detail","filename":"TE-PR-KITAURA-M-kaken 1989-64p.pdf","filesize":[{"value":"2.9 MB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"TE-PR-KITAURA-M-kaken 1989-64p.pdf","url":"https://kanazawa-u.repo.nii.ac.jp/record/34934/files/TE-PR-KITAURA-M-kaken 1989-64p.pdf"},"version_id":"881d5f3c-0e88-480e-9259-2ebd7b8b172f"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"research report","resourceuri":"http://purl.org/coar/resource_type/c_18ws"}]},"item_title":"河口砂州の発達と変形に関する研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"河口砂州の発達と変形に関する研究"},{"subitem_title":"Study on Deformation Process of Sand Bars at River Mouth","subitem_title_language":"en"}]},"item_type_id":"9","owner":"3","path":["2845"],"pubdate":{"attribute_name":"公開日","attribute_value":"2017-10-05"},"publish_date":"2017-10-05","publish_status":"0","recid":"34934","relation_version_is_last":true,"title":["河口砂州の発達と変形に関する研究"],"weko_creator_id":"3","weko_shared_id":3},"updated":"2023-07-27T14:51:02.327907+00:00"}