논문 해외 국제일반학술지 COMPOSITE FLOW RESISTANCE
- 학술지 구분 국제일반학술지
- 게재년월 2017-12
- 저자명 이종석
- 학술지명 JOURNAL OF FLOOD ENGINEERING
- 발행처명 International Science Press (India)
- 발행국가 해외
- 논문언어 외국어
홈페이지논문 초록 (Abstract)
Composite flow resistance describes cross-section average properties of resistance to flow in rivers. A data set including 2,604composite roughness values (Darcy-Weisbach f and Manning n) is closely examined. These field measurements show that b oth resistance parameters vary with flow discharge Q and friction slope Sf. The analysi s of Box-Whisker plots indicates less variability in Manning n than Darcy-Weisbach f. The ratio of the upper quartile to the lower quartile for Manning n remains less than 2.3. The variability in Manning n for boulderbed channels was higher than that of all vegetated channels. The recommended average values of Manning n for different types of channel and vegetation are generally higher than those suggested in the literature and should result in higher flood stages at a given flow discharge. These recommended values should be helpful in the practical hydraulic an alysis of river flows with one-dimensional numerical models.