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The thickness of the sand bed in the test section is kept at 0.28m. It is observed that the sand from upstream and also from both sides of the obstacle (the column) moves faster, due to accelerated sand-driving wind, as compared to those away from the column or downstream. This caused visible erosion of the sand layers in the upstream and also from sides of the column. These eroded sands are scoured deeper than those at the initial horizontal surface. The sand, which lies just before and to the side of the column”, slides down in the scoured ditch and moves downstream along the bottom of the ditch. Behind the column, the sand gradually rises up in the ditch and moves downstream with the horizontal level. Furthermore, the sand flow becomes gradually slower with increase in the scoured depth. The scoured area around the column fans out from the column with time. The column begins to oscillate as the sand below the bottom of the column begins to be scoured, and finally, it overturns windward. In the present investigation, the relation between the scoured depth around the column and the time the wind blows, also the relation between the depth of the buried column and the time required until the column overturns are clarified in detail.", "subitem_description_type": "Other"}, {"subitem_description": "本研究では, 乾燥地における樹木などを模擬した円柱を風洞内に置いて, その周りの砂が風による作用を受けて円柱にどのような影響を与えるかを光学観察で調べた。風洞の測定部における砂層の厚さは, 実際の乾燥地における砂層を模擬できるように28mmに設定した。実験結果によると, 円柱上流と側面近くの砂は円柱下流や円柱から離れた場所よりも早く洗掘され, その洗掘深さは時間の経過とともに,徐々に深くなることがわかった。また洗掘された円柱前面と側面からの砂は, 洗掘された溝を通って下流に移動し, 一部分は円柱後部に堆積するが, 大部分は円柱下流に移動することがわかった。さらに円柱周囲で洗掘される面積\nは, 円柱からほぼ円錐状に下流に広がっていくことを明らかにした。このようにして円柱周囲の砂の洗掘が進行して, 円柱底面の位置まで洗掘された後, 円柱底面の下にある砂層の上流側部分から洗掘が始まる。この洗掘が進むと底面と砂面との間に空隙ができるために, 円柱は垂直に立つことが難しくなり, 最後には風上側に転倒することがわかった。このように, 本研究では円柱周りの砂が風によりどのように洗掘されるかを調べ, また円柱が転倒するメカニズムを明らかにするとともに, 円柱周りの砂が洗掘され始めてから転倒するまでの時間と, 洗掘深さや円柱の埋設深さとの関係を明らかにした。", "subitem_description_type": "Other"}]}, "item_7_full_name_2": {"attribute_name": "著者よみ", 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"subitem_subject_scheme": "Other"}, {"subitem_subject": "wind tunnel", "subitem_subject_scheme": "Other"}, {"subitem_subject": "砂流", "subitem_subject_scheme": "Other"}, {"subitem_subject": "円柱", "subitem_subject_scheme": "Other"}, {"subitem_subject": "洗掘", "subitem_subject_scheme": "Other"}, {"subitem_subject": "風洞", "subitem_subject_scheme": "Other"}]}, "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": "departmental bulletin paper", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "Effect of Sand Flow on Overturn of Column Standing on Sand Surface", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Effect of Sand Flow on Overturn of Column Standing on Sand Surface"}]}, "item_type_id": "7", "owner": "3", "path": ["44", "4976"], "permalink_uri": "http://hdl.handle.net/10232/14105", "pubdate": {"attribute_name": "公開日", "attribute_value": "2012-05-21"}, "publish_date": "2012-05-21", "publish_status": "0", "recid": "8048", "relation": {}, "relation_version_is_last": true, "title": ["Effect of Sand Flow on Overturn of Column Standing on Sand Surface"], "weko_shared_id": 3}
Effect of Sand Flow on Overturn of Column Standing on Sand Surface
http://hdl.handle.net/10232/14105
http://hdl.handle.net/10232/1410526ec7df4-875d-4d12-b299-e18ba4052f00
名前 / ファイル | ライセンス | アクション |
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AN00040603_v62_p73-81.pdf (3.7 MB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2012-05-21 | |||||
タイトル | ||||||
タイトル | Effect of Sand Flow on Overturn of Column Standing on Sand Surface | |||||
別言語のタイトル | ||||||
その他のタイトル | 砂面に立てられた円柱の転倒に及ぼす砂流の影響 | |||||
著者 |
MOCHIZUKI, Hiroaki
× MOCHIZUKI, Hiroaki× UTOGUCHI, Ryoko |
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著者よみ | ||||||
姓名 | モチヅキ, ヒロアキ | |||||
著者よみ | ||||||
姓名 | ウトグチ, リョウコ | |||||
別言語の著者 | ||||||
姓名 | 望月, 博昭 | |||||
別言語の著者 | ||||||
姓名 | 宇都口, 涼子 | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | sand flow | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | column | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | scour | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | wind tunnel | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 砂流 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 円柱 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 洗掘 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 風洞 | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
要約(Abstract) | ||||||
内容記述タイプ | Other | |||||
内容記述 | In the present study, the sand flow around a column is investigated using a wind tunnel and a camera for optical observation. The thickness of the sand bed in the test section is kept at 0.28m. It is observed that the sand from upstream and also from both sides of the obstacle (the column) moves faster, due to accelerated sand-driving wind, as compared to those away from the column or downstream. This caused visible erosion of the sand layers in the upstream and also from sides of the column. These eroded sands are scoured deeper than those at the initial horizontal surface. The sand, which lies just before and to the side of the column”, slides down in the scoured ditch and moves downstream along the bottom of the ditch. Behind the column, the sand gradually rises up in the ditch and moves downstream with the horizontal level. Furthermore, the sand flow becomes gradually slower with increase in the scoured depth. The scoured area around the column fans out from the column with time. The column begins to oscillate as the sand below the bottom of the column begins to be scoured, and finally, it overturns windward. In the present investigation, the relation between the scoured depth around the column and the time the wind blows, also the relation between the depth of the buried column and the time required until the column overturns are clarified in detail. | |||||
要約(Abstract) | ||||||
内容記述タイプ | Other | |||||
内容記述 | 本研究では, 乾燥地における樹木などを模擬した円柱を風洞内に置いて, その周りの砂が風による作用を受けて円柱にどのような影響を与えるかを光学観察で調べた。風洞の測定部における砂層の厚さは, 実際の乾燥地における砂層を模擬できるように28mmに設定した。実験結果によると, 円柱上流と側面近くの砂は円柱下流や円柱から離れた場所よりも早く洗掘され, その洗掘深さは時間の経過とともに,徐々に深くなることがわかった。また洗掘された円柱前面と側面からの砂は, 洗掘された溝を通って下流に移動し, 一部分は円柱後部に堆積するが, 大部分は円柱下流に移動することがわかった。さらに円柱周囲で洗掘される面積 は, 円柱からほぼ円錐状に下流に広がっていくことを明らかにした。このようにして円柱周囲の砂の洗掘が進行して, 円柱底面の位置まで洗掘された後, 円柱底面の下にある砂層の上流側部分から洗掘が始まる。この洗掘が進むと底面と砂面との間に空隙ができるために, 円柱は垂直に立つことが難しくなり, 最後には風上側に転倒することがわかった。このように, 本研究では円柱周りの砂が風によりどのように洗掘されるかを調べ, また円柱が転倒するメカニズムを明らかにするとともに, 円柱周りの砂が洗掘され始めてから転倒するまでの時間と, 洗掘深さや円柱の埋設深さとの関係を明らかにした。 |
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収録雑誌名 |
鹿兒島大學農學部學術報告=Bulletin of the Faculty of Agriculture, Kagoshima University 巻 62, p. 73-81 |
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作成日 | ||||||
日付 | 2012-03-31 | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
ISSN | 04530845 | |||||
NII書誌ID(雑誌) | ||||||
収録物識別子タイプ | NCID | |||||
NC ID | AN00040603 | |||||
出版タイプ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
NDC | ||||||
主題Scheme | NDC | |||||
主題 | 454 | |||||
公開者・出版者 | ||||||
出版者 | 鹿児島大学 | |||||
公開者よみ | ||||||
公開者よみ | カゴシマ ダイガク | |||||
公開者別名 | ||||||
公開者別名 | Kagoshima University |