{"title":"RIVER WATER LEVEL PREDICTION FROM RAINFALL","authors":"T. Hiraoka, M. Ikari, H. Yuki","doi":"10.2208/jscejb.66.93","DOIUrl":"https://doi.org/10.2208/jscejb.66.93","url":null,"abstract":"","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"340 1","pages":"93-98"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77604165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"CHARACTERISTICS OF RIFFLE-POOL STRUCTURE FORMED BY A DROP STRUCTURE","authors":"Takeyoshi Chibana","doi":"10.2208/jscejb.66.223","DOIUrl":"https://doi.org/10.2208/jscejb.66.223","url":null,"abstract":"落差工の存在は周辺地形を変化させ，生物にプラス，マイナス両方の影響を及ぼす．この影響を理解すべく，複数箇所で落差工周辺の地形，流況を観測し，その特徴及び形成機構を解析した．まず，落差工はその周辺に早瀬，淵，平瀬を形成するものの，河床低下区間では淵が形成されないことを示した．また，落差工下流に淵がない場合，その下流の早瀬はアーマー化していた．一方，落差工上流の平瀬では，河道の湾曲に対応し，内岸側が堅い礫，外岸側は軟らかい砂利の河床になるという分級が生じていた．なお，淵では，垂直に落ち込む流れのため，流量が少ない時は表層のみ流れ，多い時は底層に強い流れを生じていた．この様に，落差工周辺の瀬－淵構造は，落差工の構造，河道線形，河道縦断形といった様々なスケールの因子に規定されることを示した．","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"89 2 1","pages":"223-234"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84076797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"FIELD MEASUREMENT OF FLOATING-LITTER TRANSPORT IN A RIVER UNDER FLOODING CONDITIONS","authors":"Y. Nihei, Norito Wakatsuki","doi":"10.2208/JSCEJB.66.19","DOIUrl":"https://doi.org/10.2208/JSCEJB.66.19","url":null,"abstract":"河川を経由して輸送されるゴミは沿岸部の漂着ゴミの重要な供給源となっているが，その実態は不明な点が多い．本研究では，千葉県・大堀川を対象として，洪水時における浮遊ゴミ輸送量の実態把握を目的とした現地調査を実施し，植生等の自然系ゴミの質量・有機物・栄養塩輸送量を算出した．その結果，洪水時におけるゴミ輸送量の最小値と最大値は4，5オーダーも異なり，その変動幅は1オーダー程度の流量と比べて非常に大きい．また，同一流量では増水期のゴミ輸送量は減水期よりも1オーダー大きく，ゴミ輸送量と流量のヒステリシスは一般的な汚濁負荷よりも大きい．さらに，洪水規模が大きいほどゴミ輸送量は顕著になり，流域からの汚濁負荷を考える上ではゴミ輸送による寄与が有意であることが示された．","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"1 1","pages":"19-24"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90840686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"COST-BENEFIT ANALYSIS OF BUILDING REGULATION BASED ON FLOOD RISK ASSESSMENT AND ITS COMPARISON TO LAND USE REGULATION","authors":"Y. Ichikawa, M. Teramoto, Yuusuke Numa, Ryosuke Nishizawa, Y. Tachikawa, M. Shiiba","doi":"10.2208/jscejb.66.145","DOIUrl":"https://doi.org/10.2208/jscejb.66.145","url":null,"abstract":"本研究では，大阪地域と東京地域を対象として，水災害危険度に基づいて建築規制を実施した場合に生じる費用と便益を比較することで，建築規制の利害得失や適用性について検討した．その結果，いずれの地域においても，今回検討した範囲では建築規制の総便益は正となり，建築規制は水防災対策として一定程度の適用性を有していること，大阪地域のほうが東京地域より建築規制の総便益が大きくなり，比較的少ない負担で効果的に水災害被害額を減少させうることが明らかとなった．さらに，同じ地区を規制対象とする建築規制と土地利用規制を比較したところ，建築規制のほうが土地利用規制より総便益が若干大きいか同程度となることがわかった．このことから，建築規制は床下浸水を許容する土地利用規制とほぼ同程度の適用性を有していると考えられる．","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"98 1","pages":"145-156"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81073192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"LABOLATORY EXPERIMENT AND NUMERICAL SIMULATION FOR SOLUTE TRANSPORT IN HETEROGENEOUS-UNSATURATED VERTICAL INFILTRATION FLOW FIELD","authors":"M. Saito, K. Nakagawa","doi":"10.2208/JSCEJB.66.248","DOIUrl":"https://doi.org/10.2208/JSCEJB.66.248","url":null,"abstract":"本研究では，まず透水係数が不均一に分布する場において不飽和鉛直浸透場を形成し，陽イオン交換反応を伴う溶質の移動状況を観察・測定した．実験では，下端面からの浸出水について電気伝導度，陽イオン濃度および陰イオン濃度の時間変化を測定し，巨視的な物質移動の性質について1次元移流分散方程式の理論解を用いて検討するとともに，着色溶液の浸潤状態を観察した．続いて室内実験を再現するため，不飽和浸透流解析と移流分散解析による数値シミュレーションを行った．その結果，水分保持特性の不均一性が溶質の移動状況に強く影響することが確認された．また陽イオン濃度の時間変化について，陽イオン交換反応の影響は土質構成の違いを考慮したうえで，フロインドリッヒ型の吸着等温式を用いることによって概ね再現可能であることを明らかにした．","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"44 1","pages":"248-257"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78952272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Yoshii, T. Tsubono, S. Sakai, M. Matsuyama, A. Tada, Takehiro Nakamura
The effect of surface salinity on the observation using the VHF ocean radar was investigated through the field observation in Ariake Bay. The receiving signal intensities were compared with in situ measurement of sea surface salinity of 1 m depth and wind velocity. The results show high attenuation in low salinity condition.
{"title":"FRESH-WATER PLUME OBSERVATION USING VHF OCEAN RADAR IN ARIAKE BAY","authors":"T. Yoshii, T. Tsubono, S. Sakai, M. Matsuyama, A. Tada, Takehiro Nakamura","doi":"10.2208/JSCEJB.66.289","DOIUrl":"https://doi.org/10.2208/JSCEJB.66.289","url":null,"abstract":"The effect of surface salinity on the observation using the VHF ocean radar was investigated through the field observation in Ariake Bay. The receiving signal intensities were compared with in situ measurement of sea surface salinity of 1 m depth and wind velocity. The results show high attenuation in low salinity condition.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"3 1","pages":"289-301"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88140110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Profiling and mooring measurements were carried out in Genka Bay, Okinawa, Japan to study the characteristics of the internal tidal current and its associated cooling system. The study results show that the depth-averaged current flows nearly parallel to the coastline. There is also an existence of a cross-shore internal tidal current according to the vertical structure of the horizontal current. This current influences on the bottom water temperature transmission from offshore to nearshore bottom water and changes the vertical temperature profile even of nearshore regions and thereby establishes a unique cooling system. Spectra of the baroclinic and bottom water temperature also congruent the internal tide based cooling system in GB.
{"title":"CHARACTERISTICS OF THE INTERNAL TIDE AND ITS ASSOCIATED COOLING SYSTEM IN GENKA BAY, OKINAWA, JAPAN","authors":"M. Rouf, E. Nakaza, Ryutarou Kudaka, L. Kotler","doi":"10.2208/JSCEJB.66.157","DOIUrl":"https://doi.org/10.2208/JSCEJB.66.157","url":null,"abstract":"Profiling and mooring measurements were carried out in Genka Bay, Okinawa, Japan to study the characteristics of the internal tidal current and its associated cooling system. The study results show that the depth-averaged current flows nearly parallel to the coastline. There is also an existence of a cross-shore internal tidal current according to the vertical structure of the horizontal current. This current influences on the bottom water temperature transmission from offshore to nearshore bottom water and changes the vertical temperature profile even of nearshore regions and thereby establishes a unique cooling system. Spectra of the baroclinic and bottom water temperature also congruent the internal tide based cooling system in GB.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"23 1","pages":"157-166"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75787429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
(RAP) for an distributed hydrological model in (137.5 ), The RAP data were observed spatially, 2.5 km (cid:2) 2.5 km resolution. The result shows that the accuracy of river water discarge was improved by 30-60% compared with the ground-based precipitation data, those were observed at around 17 km interval. Based on a classification of the rainfall characteristics, we clarify that not only a decrease
(RAP)为(137.5)中的分布式水文模型，RAP数据在空间上观测，分辨率为2.5 km (cid:2) 2.5 km。结果表明，与地面降水资料相比，河流弃水的精度提高了30 ~ 60%，而地面降水资料的观测间隔约为17 km。在对降雨特征进行分类的基础上，阐明了不仅有减少
{"title":"RIVER RUNOFF ANALYSIS USING RADAR-AMeDAS COMPOSITE PRECIPITATION IN A MIDDLE-SCALE RIVER BASIN AND ITS VERIFICATION BASED ON THE CLASSIFICATION OF RAINFALL CHARACTERISTICS","authors":"M. Ishizuka, H. Yoshida, T. Miyazaki","doi":"10.2208/JSCEJB.66.35","DOIUrl":"https://doi.org/10.2208/JSCEJB.66.35","url":null,"abstract":"(RAP) for an distributed hydrological model in (137.5 ), The RAP data were observed spatially, 2.5 km (cid:2) 2.5 km resolution. The result shows that the accuracy of river water discarge was improved by 30-60% compared with the ground-based precipitation data, those were observed at around 17 km interval. Based on a classification of the rainfall characteristics, we clarify that not only a decrease","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"139 1","pages":"35-46"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87544683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"AN ATTEMPT TO MEASURE THE OXYGEN TRANSFER RATE OF GAS DISSOLVING DEVICE IN SEPARATE TYPE EXPERIMENT","authors":"K. Ohgi, K. Hadano, Jun Ma, K. Asai, Yoichi Nakano","doi":"10.2208/JSCEJB.66.407","DOIUrl":"https://doi.org/10.2208/JSCEJB.66.407","url":null,"abstract":"水域の貧酸素化対策に用いる気体溶解装置の酸素溶解能力は酸素移動速度により評価される．酸素移動速度の測定は，ふつう水槽中で気泡を発生させる処理水混合型の酸素溶解処理で行なわれるが，加圧型の気体溶解装置には適用できない，総括酸素移動容量係数の評価が必要で測定に手間を要する，などの課題があった．本研究では，加圧型と常圧型の両方の気体溶解装置に適用可能で，任意のDO濃度の水に適用でき，しかも総括酸素移動容量係数の評価を必要としない，省力型の酸素移動速度の測定方法を提案している．DO濃度増分は気体溶解処理前の濃度をゼロとした場合に想定される値として換算ΔDOにより評価し，酸素移動速度を水温20°Cに換算して評価している．室内での比較実験により本提案の測定法が妥当であることを示した．","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"1 1","pages":"407-418"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81147862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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