{"created":"2021-03-01T06:52:31.873024+00:00","id":33718,"links":{},"metadata":{"_buckets":{"deposit":"7ef9d347-e9ba-48b0-ab95-0f2f94dbe757"},"_deposit":{"id":"33718","owner":"1","owners":[],"pid":{"revision_id":0,"type":"depid","value":"33718"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00033718","sets":["80:4535:4967:4971","9:504:4538:4969:4972"]},"author_link":["131681","131680"],"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"昭和22年9月関東洪水の市街地における粗度係数"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1963-09-30","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"3","bibliographicPageEnd":"686","bibliographicPageStart":"681","bibliographicVolumeNumber":"41","bibliographic_titles":[{"bibliographic_title":"東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo"}]}]},"item_4_description_13":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_4_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"1947年9月15日本邦を襲つたカスリーン台風は,関東・東北各地に甚大な水害を与えたが,特に利根川および荒川の支流を含めた数個所の河川堤防が欠潰し,埼玉県および東京都の東部地域に洪水をもたらした.建設省国土地理院(当時の地理調査所)は被災直後,洪水地域における詳細な調査を行なったが,その調査資料の内,江戸川の桜堤の欠潰によつて生じた,東京都葛飾区・江戸川区における洪水地域各所の流速および粗度係数を計算し,市街地と田畑地区との相異を考察した.桜堤の欠潰点から江戸川区東船堀町に亘るFig.1に示すような,洪水の主流に沿つて1km毎に主流と直角な断面図を求めた.(Fig.2)Fig.3は洪水の主流に沿つた縦断面図を示すもので,平均浸水高の勾配は図からi=2.6×10-4である.Fig.3に示すように,洪水は巾の広い矩形断面の開水路に流れる不等流として取扱い,Chezyの公式を応用して,流速はv=C√Ri,ただしR≒h(R:径深,h:平均浸水高m),i:水流の勾配で表わされる.Fig.3に示すように洪水の到達時刻が観測されているから,これと浸水高とから連続の条件で各断面間の流量が推定され,流速が導き得る.したがつてCは上式から求まる.Table 1に各断面における諸値を示す.次にForchheimerの公式C=1/nR0.2(m-秒単位)を用い,主流に沿つた各点での粗度係数nが求まり,Fig.1に示す地形を考察すれば市街地n=0.023田畑n=0.012となる.平均流速は約1m/secで,市街地域で遅く田畑地域では速い.したがつて粗度係数は市街地域が田畑地域より大きく,常識的に矛盾のない結果が得られた.洪水の現象は,陸上に溢流した津波の動向に類似した点が多く,津波の溢流速度を求めるとき,ここで得た粗度係数は一つの資料となりうるであろう.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"131681","nameIdentifierScheme":"WEKO"}],"names":[{"name":"羽鳥, 徳太郎"}]}]},"item_4_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15083/0000033718","subitem_identifier_reg_type":"JaLC"}]},"item_4_publisher_20":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"東京大学地震研究所"}]},"item_4_source_id_10":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00162258","subitem_source_identifier_type":"NCID"}]},"item_4_source_id_8":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"00408972","subitem_source_identifier_type":"ISSN"}]},"item_4_subject_15":{"attribute_name":"日本十進分類法","attribute_value_mlt":[{"subitem_subject":"453","subitem_subject_scheme":"NDC"}]},"item_4_text_21":{"attribute_name":"出版者別名","attribute_value_mlt":[{"subitem_text_value":"Earthquake Research Institute, University of Tokyo"}]},"item_4_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"地震研究所"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Hatori, Tokutaro"}],"nameIdentifiers":[{"nameIdentifier":"131680","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-06-26"}],"displaytype":"detail","filename":"ji0413011.pdf","filesize":[{"value":"571.4 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"ji0413011.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/33718/files/ji0413011.pdf"},"version_id":"b8dafb8e-e25d-4a8a-9cdf-3c6bcd77ca79"}]},"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":"The Roughness Coefficient in a Town Area Observed in the Case of the Kanto Flood of Sept. 1947","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"The Roughness Coefficient in a Town Area Observed in the Case of the Kanto Flood of Sept. 1947","subitem_title_language":"en"}]},"item_type_id":"4","owner":"1","path":["4971","4972"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2008-05-30"},"publish_date":"2008-05-30","publish_status":"0","recid":"33718","relation_version_is_last":true,"title":["The Roughness Coefficient in a Town Area Observed in the Case of the Kanto Flood of Sept. 1947"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-12-19T04:55:07.021543+00:00"}