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OHASHI Keisuke
Title Assistant Professor
Department Department of Civil Engineering
Course Disaster Reduction Studies Course

Research fields

1. Sediment runoff in river system

"Sediment runoff potential power" is defined as the annual potential energy onto river basin, and available to be a better predictor variable of sediment transportation volume. This estimation is independent from basin-size and suitable for both small size basin and large size water system. Through this study, "the combined hypsometric curve" which represents confluences tributaries was developed and relationship between Sediment runoff potential power and geological features was investigated.

2. Computational grain sizing

Image processing for photographed grain sizing brings better result than former method, sieving analysis. Distributions of grain size provide the bed-load and suspended-load function, and the result corresponded to observed survey. We tried to develop photograph method and an oblique photograph compensation function was able to make grain sizing more efficient.

3. Observation of ground water recharge

We succeeded in evaluating groundwater recharge volume on Gifu alluvial fan by using ADCP (Acostic Doppler Current Profiler) and finding that the groundwater flows along the former river channel of the Nagara River.

result of computational grain sizing river and groundwater contour map in Gifu City

Research Keywords

river engineering, sediment runoff, computational grain sizing, observation of groundwater recharge by ADCP

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