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Field Measurements of the Absolute Pressure Distribution Acting on Bed Material

Author(s): Ryota Tsubaki, Yuji Toda, Masaya Miyamoto

Linked Author(s): Ryota Tsubaki

Keywords: Pressure measurements, bed materials, gravel bed rivers

Abstract: To estimate the pressure distribution surrounding model cobble, two pressure sensors are embedded in a model cobble and placed in a river bed. A field measurement campaign within a cobble-bed river during an artificial flood is implemented and a time-series of pressure changes on the upstream and downstream side of the model cobble are analyzed in order to determine information regarding turbulent fluid forces acting on bed material during an artificial flood. Running average upstream pressure is higher than downstream pressure. The difference between upstream and downstream pressure is related to the form-drag acting on bed material. Fluctuations in upstream pressure are substantially larger as compared to downstream pressure, especially during high flow periods


Year: 2017

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