Abstract
The study team found that the sediment balance study considering the recession and delay of flow curve showed a 10% of difference between actual condition at the river mouth and Aimoto gauging station at the cooperating flushing in 2015.
This study described that the field observation, which was based on the previous observation study carried out in 2011, with three additional considerations; i) using speed boats and two way observations, ii) improving efficiency using multi observation methods by selection of targeted water channel corresponding to the water depth, iii) clarify the impact on the flow recession due to turbidity.
The study team also found that the relationship between surface flow velocity and cross-sectional average flow velocity is almost same by using the coefficient of float which was based on the traditional methods. Further, once the topographic conditions and water level is known, it is simple to estimate the stream flow using surface water flow.
Some proposals are also discussed for field observations.
