Deriving Channel Width-discharge Relationship from Remote Sensing Imagery and Digital Elevation Models

Kim Jong Chun, Paik Kyungrock
2015 Journal of Korea Water Resources Association  
We propose a method for deriving the relationship between channel width and discharge from remote sensing products. Stream widths at points distributed along a river network can be measured from high-resolution remote imagery. Further, corresponding drainage area for these points can be calculated using digital elevation models, making it possible to construct width-drainage area relation. On the other hand, the relationship between the flow discharge and the drainage area is obtained from
more » ... rical data measured at ground stations. By coupling these two relationships, we can finally derive the width-discharge relationship which comprises an important component of downstream hydraulic geometry. The proposed method was tested for the Nakdong River and the Seomjin River, successfully capturing power-law exponents in the width-discharge relationships reported in earlier studies. The proposed approach can serve as an alternative for obtaining the hydraulic geometry relationship under the limits of ground data.
doi:10.3741/jkwra.2015.48.8.685 fatcat:wy7iq7u2l5b5xjhbc6p3utn3d4