Contribution of baseflow during dry spells in irregular channel cross section |
| |
| Authors: | Tae Beom Kim Jeong‐Seok Yang |
| |
| Affiliation: | School of Civil and Environmental Engineering, Kookmin University, Seoul, Korea |
| |
| Abstract: | The discharge and water level of a gaining stream are known to be maintained during dry spells by baseflow, which is defined as discharge from underground storage. However, the effect of baseflow on a real river is not well known because direct measurements of baseflow in field are difficult to conduct. Therefore, this study attempts to clarify the contribution of baseflow to streamflow and the extent to which the water level is maintained even during dry spells. A digital filter technique is applied to the records of daily mean streamflow in order to estimate the amount of baseflow, and the lateral distribution method is applied to irregular cross sections at observational sites to obtain the stage–discharge rate curve. Through a comparison of the observed data and calculation results, the amount of baseflow is estimated across the channel, in addition to the maximum water level retained during dry spells in relation to the baseflow. Finally, based on the results of an energy conservation model, this study proposes that the source of the amount of baseflow estimated across a channel section may be different from that of the water level maintained during dry spells. |
| |
| Keywords: | baseflow analysis baseflow separation hydrograph lateral distribution method stage– discharge relation |
|
|
