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Analysis of Gradually Varied Flow Considering Relative Depth in Circular Pipe  

Kim, Minhwan (호남대학교 토목환경공학과)
Park, Junghee (호남대학교 토목환경공학과)
Song, Changsoo (호남대학교 토목환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.21, no.3, 2007 , pp. 287-294 More about this Journal
Abstract
When we use the circular pipes for wastewater and storm water, we should be known the characteristics of the flow for accurate design. To elevate the design accuracy, we want to know the profile of flow. The roughness coefficient in the Manning equation is constant, but in actuality changed with the relative depth in circular pipe. This study was conducted to calculate the relative normal depth in changing the roughness coefficient (named relative roughness coefficient) with the relative depth in the analysis of gradually varied flow in the circular pipe by Newton-Raphson method. We performed the analysis of gradually varied flow using the relative normal depth and the relative roughness coefficient. We presented the 12 flow profiles with the relative depth and the relative roughness coefficient in circular pipe. The flow classification considering relative depth in circular pipe is available to analyse gradually varied flow profiles.
Keywords
gradually varied flow; relative depth; normal depth; roughness coefficient of Manning; hydraulic characteristic curve; flow profile;
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