밀도프루드수에 의한 하수관로 침전물 이송 특성 분석open accessAnalysis of characteristics of sediment transport in sewers by densimetric Froude number
- Authors
- 박규홍; 이태훈; 유순유; 강병준; 현기림
- Issue Date
- Feb-2020
- Publisher
- 대한상하수도학회
- Keywords
- Sewers; Sediment transport; Densimetric Froude number; Minimum velocity; Shear stress; 수관로; 침전물 이송; 밀도프루드수; 최소유속; 전단응력
- Citation
- 상하수도학회지, v.34, no.1, pp 45 - 52
- Pages
- 8
- Journal Title
- 상하수도학회지
- Volume
- 34
- Number
- 1
- Start Page
- 45
- End Page
- 52
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/38267
- DOI
- 10.11001/jksww.2020.34.1.045
- ISSN
- 1225-7672
2287-822X
- Abstract
- Even though sewers have conventionally been designed to prevent from sediment deposition using a specified minimum velocity or shear stress at a particular depth of flow or with a particular frequency of occurrence, it was appreciated that these methods do not consider the characteristics and concentration of the sediment and the specific hydraulic conditions of the sewer with sediment. In this study, a densimetric Froude number formula was suggested considering particle diameter and volumetric concentration of the sediment as well as flow depth and flowrate, based on several domestic field inspections, which was compared with other formulas proposed by previous investigators. When the sediment concentration was not considered, the calibration coefficient of 0.125-1.5 to the densimetric Froude numbers of this study was needed to obtain the similar ones with previous investigators’. For the densimetric Froude number formula obtained with consideration of sediment concentration, the exponent value of term Cv was almost the same as that of previous results and that of d50/Rh was similar for Fr < 2.2.
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