1992 Fiscal Year Final Research Report Summary
Study on Generalized theory for Sediment Transport Process in Unsteady Flow
| Project/Area Number |
02452203
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Hydraulic engineering
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
NAKAGAWA Hiroji Kyoto University, Division of Global Environment Engineering, Professor, 工学部, 教授 (60027216)
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| Co-Investigator(Kenkyū-buntansha) |
GOTOU Hitoshi Kyoto Univ., Dept. of Civil Eng., Instructor, 工学部, 助手 (40243068)
KITAMURA Tadanori Kyoto Univ., Div. of Global Envirn., Eng., Instructor, 工学部, 助手 (00243064)
MURAKAMI Shogo Kyoto Univ., Div. of Global Envirn., Eng., Instructor, 工学部, 助手 (70166247)
TSUJIMOTO Tetsuro Kanazawa Univ., Dept of Civil Eng., Assoc. Professor, 工学部, 助教授 (20115885)
NEZU Iehisa Kyoto Univ., Div. of Global Envirn. Eng., Assoc. Prof., 工学部, 助教授 (30109029)
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| Project Period (FY) |
1990 – 1992
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| Keywords | unsteady flow / non-uniform flow / pressure gradient flow / bed-load / suspended load / non equilibrium process / stochastic model |
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| Research Abstract |
The stochastic model quite well describes the temporal and spatial non-equilibrium processes of the sediment transport in both the unsteady and non-uniform flow. This model is consisted of the three subsystems; 1) dislodgement of the particle from the bed characterized by the sediment pick-up rate, 2) the spatial side of the transport characterized by the step length, 3) the temporal side of the transport characterized by the moving period. The hydraulic experiments shows the applicability of the proposed model and the details of the phenomena.
The three subsystems are related to the hydraulic parameters based upon both the dynamics and the probabilistic properties of themselves, and the respective relations are approximately expressed by the appropriate equations. Their applicabilities are shown by the devised experiments.
The turbulent structure of the unsteady open channel flow is experimentally investigated. In order to examine the change of the flow according to that of the unsteadiness systematically, the unsteady parameter is defined which is constituent of both the properties of base flow and the temporal change of the water depth. By using the proposed parameter, the 1-dimensional hydraulic quantities and temporal change of the flow structure are systematically described.
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