2003 Fiscal Year Final Research Report Summary
Study on Mechanism of Local Scour in downstream of Bed Protection Works
| Project/Area Number |
14550519
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
水工水理学
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| Research Institution | Akashi National College of Technology |
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Principal Investigator |
KANDA Keiichi Akashi National College of Technology, Department of Civil Engineering, Associate Professor, 都市システム工学科, 助教授 (60214722)
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| Project Period (FY) |
2002 – 2003
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| Keywords | LOCAL SCOUR / BED PROTECTION WORKS HYDRAULIC EXPERIMENT / NUMERICAL SIMULATION / RICH-IN-NATURE RIVER WORKS / 多自然型工法 |
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| Research Abstract |
THIS STUDY DEALS WITH LOCAL SCOUR IN DOWNSTREAM OF BED PROTECTION WORKS IN ORDER TO ESTABLISH THE REASONABLE DESIGN OF THE BED PROTECTION WORKS. THE CONCLISIONS OF THIS STUDY CAN BE DRAWN AS FOLLOWS.
1.A DETAILD FIELD SURVEY WAS CARRIED OUT REGARDING LOCAL SCOUR AT THE SECTION OF NINOARATE WEIR HAVING A BROAD CRESTE AND CULVERTS IN HYAKKEN RIVER, PREPARATIONS FOR MEASURING STREAM CONDITIONS AND SCOUR DEPTH AT A FLOOD WERE MADE.
2.THE EXPERIMENTS WERE CARRIED OUT IN CASE OF SUDDEN CHANGE IN BED ROUGHNESS LONGITUDINALLY FROM A ROUGH BED CONSISTING OF THREE TYPES OF BED PROTECTION WORKS TO A MOVABLE BED UNDER DYNAMIC CONDITION OF BED LOAD. VARIATIONS OF BED PROFILE AND THE MAXIMUM DEPTH OF SCOUR HOLE WERE DISCUSSED AND FLOW CHARACTERISTICS WERE MEASURED AT SEVERAL STAGES OF SCOUR. AS THE RESULT, A METHOD TO REDUCE SCOUR DEPTH BY USING RICH-IN-NATURE TYPE RUBBLE WORKS WAS PROPOSED.
3.BASED ON THESE RESULTS, 2-D NUMERICAL SIMULATIONS FOR LOCAL SCOUR IN DOWNSTREAM OF BED PROTECTION WORKS USING BOUNDARY FITTED COORDINATE SYSTEM WERE PROPOSED AND APPLIED TO THE EXPERIMENTS. COMPARING THE NUMERICAL AND EXPERIMENTAL RESULTS VERIFIED THE ABILITY OF THIS MODEL TO PREDICT THE SCOUR PROCESS
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Research Products
(10 results)
