{"created":"2023-05-15T13:38:16.686245+00:00","id":2168,"links":{},"metadata":{"_buckets":{"deposit":"d18d9a36-1d5f-4fed-bb2c-ab05dc118b3f"},"_deposit":{"created_by":12,"id":"2168","owners":[12],"pid":{"revision_id":0,"type":"depid","value":"2168"},"status":"published"},"_oai":{"id":"oai:repository.naro.go.jp:00002168","sets":["87:661:662:135:222"]},"author_link":["578"],"item_10002_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2005-03-01","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"104","bibliographicPageStart":"67","bibliographicVolumeNumber":"44","bibliographic_titles":[{"bibliographic_title":"農村工学研究所報告"},{"bibliographic_title":"Bulletin of the NARO, Rural Engineering","bibliographic_titleLang":"en"}]}]},"item_10002_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"There are a large number of small dam, more than 200,000, in Japan for irrigation of paddy fields. Most of these small dams have been constructed before the modern period with old construction methods. Therefore, disasters of dam breakage sometimes occur in large rainfall. In order to prevent these disasters, a refurbishing project of old small dams have been conducted in recent years. A problem in the project is that total refurbishing costs will become large by numerous old small dams though refurbishing costs per one small dam is small. In this thesis, I examined hydraulic performances of a labyrinth weir in order to reduce a spillway refurbishing costs which occupies large part of a dam refurbishing costs, especially in a fill dam. A labyrinth weir is a zigzag plane shaped weir and it is expected to decrease a spillway size by its high discharge ability. Especially, a high density or quasi-rectangular labyrinth weir can be preferable in limited space, e.g., on a refurbished spillway of a small fill dam because the crest length of the labyrinth weir is relatively long even if the longitudinal space is limited. But discharge coefficient, overflow state of a high density or quasi-rectangular labyrinth weir was not clear enough for its application to a dam spillway. Its overflow state can be a problem because the overflow state often becomes unstable by its thin sectional shape which is inevitable for its zigzag plane shape. From the above considerations, I examined discharge ability, overflow states with sharp crested labyrinth weirs including them of high density zigzag shape or rectangular shapes. Results of this thesis are summarized in the following. 1) Relations between H/P (H:overflow head, P:Weir height at upstream side) and discharge coefficient, overflow states became clear with sharp crested labyrinth weirs including them of high density or quasi-rectangular shapes. And discharge coefficient formulas of them were proposed (see Table 4). 2) H/P range of unstable overflow became clear from 1) (see Table 3). It is useful to decide the design head for overflow stability by splitter piers, increase of tailwater level. 3) It became clear from 2) that H/P range of unstable overflow was narrow in shapes of W/P ＝ 1.5 ～ 2 in spite of change of A/W, L/W (W: width of 1 cycle of a labyrinth weir except its elbow, L: crest length of 1 cycle of a labyrinth weir except its elbow, A: apex half length of a labyrinth weir). 4) It became clear that labyrinth weirs of W/P ≦ 2 and A/W ≒ 0.0765 had the advantage by both their discharge ability and overflow stability on the condition of small dam spillways. 5) Hydraulic design procedures were proposed with sharp crested labyrinth weirs.","subitem_description_type":"Abstract"}]},"item_10002_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.24514/00002074","subitem_identifier_reg_type":"JaLC"}]},"item_10002_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"独立行政法人 農業・生物系特定産業技術研究機構 農村工学研究所"}]},"item_10002_relation_14":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type":"isIdenticalTo","subitem_relation_type_id":{"subitem_relation_type_id_text":"10.24514/00002074","subitem_relation_type_select":"DOI"}}]},"item_10002_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"1882-3262","subitem_source_identifier_type":"ISSN"}]},"item_10002_version_type_20":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"常住, 直人"},{"creatorName":"ツネスミ, ナオト","creatorNameLang":"ja-Kana"},{"creatorName":"TSUNESUMI, Naoto","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"578","nameIdentifierScheme":"WEKO"},{"nameIdentifier":"80370542","nameIdentifierScheme":"e-Rad","nameIdentifierURI":"https://kaken.nii.ac.jp/ja/search/?qm=80370542"},{"nameIdentifier":"naoto23","nameIdentifierScheme":"researchmap","nameIdentifierURI":"http://researchmap.jp/naoto23"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2019-03-20"}],"displaytype":"detail","filename":"nkk_report_No44p67-104p.pdf","filesize":[{"value":"1.1 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"nkk_report_No44p67-104p.pdf","url":"https://repository.naro.go.jp/record/2168/files/nkk_report_No44p67-104p.pdf"},"version_id":"46acb76c-3a3e-4e0b-90c0-bf6b0bbb501d"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"ダム","subitem_subject_scheme":"Other"},{"subitem_subject":"洪水吐","subitem_subject_scheme":"Other"},{"subitem_subject":"堰","subitem_subject_scheme":"Other"},{"subitem_subject":"ラビリンス堰","subitem_subject_scheme":"Other"},{"subitem_subject":"水理設計","subitem_subject_scheme":"Other"},{"subitem_subject":"dam","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"spillway","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"weir","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"labyrinth weir","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"hydraulic design","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"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":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"ラビリンス堰の放流特性および小規模ダム洪水吐への適用効果について","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"ラビリンス堰の放流特性および小規模ダム洪水吐への適用効果について"},{"subitem_title":"The Performance and Discharge Characteristics of High Density or Quasi-rectangular Labyrinth Weirs for Small Dam Spillways","subitem_title_language":"en"}]},"item_type_id":"10002","owner":"12","path":["222"],"pubdate":{"attribute_name":"公開日","attribute_value":"2019-03-22"},"publish_date":"2019-03-22","publish_status":"0","recid":"2168","relation_version_is_last":true,"title":["ラビリンス堰の放流特性および小規模ダム洪水吐への適用効果について"],"weko_creator_id":"12","weko_shared_id":-1},"updated":"2023-05-15T16:35:45.805948+00:00"}