科目名 Course Title Sediment Transport [土砂輸送特論 E] 講義題目 Subtitle 責任教員 Instructor 泉 典洋 [Norihiro IZUMI] (大学院工学研究院) 担当教員 Other Instructors 開講年度 Year 2013 時間割番号 Course Number (E3) 092196 (31002) 開講学期 Semester 2学期 単位数 2 Number of Credits 補足事項 Other Information キーワード Key Words fluid mechanics, morphodynamics, open channel flow, sediment transport, river morphology 授業の目標 Course Objectives Morphology and configuration of river channels are determined by the sediment movement due to flow, but the flow itself is in turn strongly affected by the channel configuration. The river morphology is self-organized by the interaction between the flow and the channel configuration. It is important to predict river morphology formed under given conditions from viewpoints of flood protection, sustainable development of water resources, and advanced and integrated land use planning. One of the objectives of this lecture is to obtain advanced knowledge on fluid mechanics, sediment transport, and morphodynamics in rivers, needed to solve a variety of river engineering problems. 到達目標 Course Goals To understand the concepts of mechanics underlying sediment transport processes and morphological evolution of river beds To obtain the ability to evaluate sediment transport in rivers, and predict the morphological change of river beds To acquire the ability to solve sediment transport problems and morphological problems caused by sediment transport To understand linear and nonlinear stability analyses applicable to problems related to sediment transport and river morphology 授業計画 Course Schedule (1) Introduction (2) Sediment Properties rock types, specific gravity, size, size distribution, porosity, shape (3) Review of Fluid Mechanics 1 Navier-Stokes equations, Reynolds decomposition (4) Review of Fluid Mechanics 2 bed shear stress, relations for channel resistance, St. Venant shallow water equations (5) Equations of Particle Motion particle moving through quiescent fluid, terminal fall velocity in quiescent fluid, particle in a moving fluid, collision with the bed, diffusion of turbulence (6) Macroscopic View of Sediment Transport bedload, suspended load, Exner equation (7) Threshold Condition for Sediment Motion Critical stress for flow over a granular bed, Shields diagram (8) Mechanics of Bedload Transport 1 Bagnold hypothesis of bedload transport (9) Mechanics of Bedload Transport 2 Ashida-Michiue formula, smorgasbord of bedload transport relations (10) Suspended Sediment Transport 1 mass conservation of suspended sediment, Rousean distribution of suspended sediment (11) Suspended Sediment Transport 2 vertically-averaged concentration, relation for sediment entrainment (12) Descriptive Analysis of Bedforms introduction of bedform mechanics, dunes, antidunes, ripples, bars (13) Stability Analysis of Bedforms 1 one-dimensional St. Venant model of bedform stability, modified St. Venant stability model (14) Stability Analysis of Bedforms 2 shear flow model 準備学習(予習・復習)等の内容と分量 Homework Five to six assignments during a term 成績評価の基準と方法 Grading System 60 %: assignments (5-6 assignments during a term), 40 %: final exam (or final project) テキスト・教科書 Textbooks Sedimentation Engineering/Marcelo H. Garcia/ASCE Handouts prepared by the instructor 講義指定図書 Reading List Fluid Dynamics/J.W. Daily, and D. R. Harleman:Addison-Wesley,1966 Loose Boundary Hydraulics/J. Raudkivi:Pergamon,1990 参照ホームページ Websites http://earth-fe.eng.hokudai.ac.jp/lecture/SedimentTransport.html 研究室のホームページ Website of Laboratory http://earth-fe.eng.hokudai.ac.jp/ 備考 Additional Information PARE 発展科目(This is a PARE Core Cluster Subject)