수위-유속 분산 그래프를 통한 하수흐름 특성 분석

다국어 초록 (Multilingual Abstract)

To perform long-term sewer monitoring, It is important to understand the nature of the wastewater flow that occurs at the point on early stage of the monitor and to prevent in advance a problem which may caused. We can infer the flow properties and external factors by analyzing the scatter graph obtained from the measured data flow rate monitoring data since an field external factor affecting the sewage flow is reflected in the flow rate monitoring data. In this study, Selecting the three points having various external factors, and we Inferred the sewer flow characteristics from depth-velocity scatter graph and determined the analysis equation for the dry-weather flow rate data. At the‘point 1’expected non-pressure flow, we were able to see the drawdown effect caused by the free fall in the manhole section. At the‘point 2’, existed weir and sediments, there was backwater effect caused by them, and each of size calculated from the scatter graph analysis were 400 mm and 130 mm. At the‘Point 3’, there is specific flow pattern that is coming from flood wave propagation generated by the pump station at upstream. In common, adequate equations to explain the dry weather flow data are flume equation and modified manning equation(SS method), and the equations had compatibility for explaining the data because all of R2 values are over 0.95.

참고문헌 (Reference)

1 Butler, D, "Urban drainage" CRC Press 163-164, 2004

2 Ministry of environment, "Standard manual for estimating sewer I/I(infiltration and inflow)"

3 Ludwig, R. G, "Simplified application of Palmer-Bowlus flow meters" 2764-2769, 1974

4 Ministry of environment, "Sewer flowmeter Installation and Maintenance manual"

5 Stevens, P. L, "Scattergraph Principles and Practice: Characterization of Sanitary Sewer and Combined Sewer Overflows" 1-15, 2007

6 Enfinger, K. L, "Scattergraph Principles and Practice: A Comparison of Various Applications of the Manning Equation" 2004

7 Stevens, P. L, "Sanitary Sewer Overflows Leave Telltale Signs in Depth-Velocity Scattergraphs"

8 Stevens, P. L, "New Diagnostic Tools Improve the Accuracy of the Manning Equation" 1998

9 Lanfear, K. J, "Modifying Manning’s Equation for Flow Rate Estimates" 125 (125): 1978

10 Chapra , S. C, "Applied numerical methods" McGraw Hill 2012