Use of steady flow one-dimensional model in unsteady flow conditions
Başlık çevirisi mevcut değil.
- Tez No: 400125
- Danışmanlar: DR. CHANDRA NALLURİ
- Tez Türü: Yüksek Lisans
- Konular: İnşaat Mühendisliği, Civil Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1997
- Dil: İngilizce
- Üniversite: University of Newcastle upon Tyne
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 203
Özet
Özet yok.
Özet (Çeviri)
In this thesis, the use of a one-dimensional steady model in unsteady flow conditionsin a river was studied.To examine the applicability of a one-dimensional steady model in unsteady flowconditions (flood flow) in a river, besides the one-dimensional steady model (HECRAS),the one-dimensional unsteady model (ISIS) was employed.The middle of the River Tame in Birmingham in the UK was selected as a study reach.The reach, about 29 km long, consists of 64 bridges and 275 cross-sections with anaverage cross-section spacing of 103 m. However, the reach was modified by omittingthe bridges and increasing the bed roughness. These modifications produced 4different cases that were analysed to find out the most suitable condition for the use ofthe steady model.With regard to the following criteria; the transient effects of the bridges, theattenuation rate parameter and the extent of the unsteadiness of the flow, the selectionof the steady model in the unsteady flow conditions was examined. In addition, foreach case, a comparison between the water surface profiles obtained from the steadymodel and the unsteady model was made and the following conclusions were drawn.Firstly, in the absence of the bridges the use of the steady model in the unsteady flowconditions was found to be more suitable than when there were bridges. Secondly, theattenuation rate parameter was found to be a useful criterion on which to select theuse of the steady or the unsteady model in the unsteady flow conditions. Finally, whenthe extent of the unsteadiness of the flow increased, the dissimilarities between theresults obtained from the steady and the unsteady models also amplified. Therefore, itwas discovered that the use of steady model depended on the degree of theunsteadiness of the flow.
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