Author(s): Sang Jin Lee; Man Ha Hwang; Ick Hwan Ko; Baesung Lee
Linked Author(s):
Keywords: Roughness coefficient; Stream discharge estimation; Rating curve; Water level& Slope
Abstract: The discharge in a natural river can be determined by direct or indirect measurement. In general, the flow velocity is measured by using float during the flood season and current meters or partial-flumes during the normal or dry season. However, these methods can cause significant errors according to the expertness of engineer and the condition of observation point makes a difficulty to measure continuously. In this study, we developed a model to estimate efficiently the discharge with the coefficient of roughness which can be considered major hydraulic characteristic in a natural river. We can obtain continuous discharge data through the basic hydraulic information including water level, river bed, water slope and pertinent coefficient of roughness without field measurements for flow velocity. Discharge measurements in field have been carried out at Gonju gage station located in the down stream of the Daechung Dam during normal and dry seasons from 2003 to 2004. The model developed in this study is compared with results from existing rating curve at T/M gage stations and can be used to runoff analyses.
Year: 2005