Shallow lakes are more susceptible to the effects of climate and climatic changes than deep lakes and dams because of their small depth. In shallow lakes, diurnal stratification occurs during daytime with mixing during nighttime, although it is not easy to model and analyze the effects of diurnal stratification. In this study, after preparing wind condition and estimation of temperature of inflowing river water, we aimed to improve the simulation of water temperature stratification in Lake Suwa by using a bottom heat transfer model that can take into account the cooling effect of mud at the bottom of the lake. The results suggested that the mud layer at the bottom of Lake Suwa cools the bottom water mass directly in summer period when the temperature is vertically stratified, and the hydrodynamic model coupled with the bottom heat transfer model would effectively simulate the structure of the theramal stratification in summer. Meanwhile, lowering the inflow river temperature as a boundary condition did not have a significant effect on the reproduction of low temperature in summer bottom layer.
"},{"@language":"ja","@value":"浅い湖沼はその水深が小さいがゆえ，気候変動や気象変化の影響を深い湖沼やダム湖より受けやすい．夏季には水温成層が生じ，容易に形成と解消を繰り返すことに加え，境界条件設定のための観測も十分でないことも多く，水温分布の再現およびモデルによる影響解析は簡単ではない．本検討では，諏訪湖を対象に湖底の土壌による冷却効果を考慮できる底面非断熱モデルを用いて水温成層の再現性向上を目指した．加えて，推定河川水温が推定精度不足である可能性を考慮して，河川水温の変化に伴う水温分布への影響を評価し，水温成層の形成要因の解析を試みた．その結果，諏訪湖では湖底の土壌が直上の水塊を冷却している可能性が示唆され，また非断熱モデルが夏季の水温成層構造の再現を容易にすることを示した．
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Yusuke"},{"@language":"ja","@value":"中谷 祐介"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"大阪大学 大学院工学研究科地球総合工学専攻"}]},{"@id":"https://cir.nii.ac.jp/crid/1410009640045097600","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000415324052"}],"foaf:name":[{"@language":"en","@value":"MIYABARA Yuichi"},{"@language":"ja","@value":"宮原 裕一"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"信州大学 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Engineers, Ser. 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JSCE"},{"@language":"en","@value":"JJSCE B1"},{"@language":"en","@value":"B1"},{"@language":"ja","@value":"土木学会論文集Ｂ１（水工学）"},{"@language":"ja","@value":"土木学会論文集Ｂ１"},{"@language":"ja","@value":"水工学論文集"},{"@language":"ja","@value":"土論Ｂ１"}],"dc:publisher":[{"@language":"en","@value":"Japan Society of Civil Engineers"},{"@language":"ja","@value":"公益社団法人 土木学会"}],"prism:publicationDate":"2021","prism:volume":"77","prism:number":"2","prism:startingPage":"I_1081","prism:endingPage":"I_1086"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","url":[{"@id":"https://www.jstage.jst.go.jp/article/jscejhe/77/2/77_I_1081/_pdf"}],"availableAt":"2021","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=stratification","dc:title":"stratification"},{"@id":"https://cir.nii.ac.jp/all?q=water%20temperature","dc:title":"water temperature"},{"@id":"https://cir.nii.ac.jp/all?q=hydrodynamics%20model","dc:title":"hydrodynamics 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