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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Designing a "smart pebble" for sediment transport monitoring
Designing a "smart pebble" for sediment transport monitoring
Author : MANOUSOS VALYRAKIS(1), EDGARS PAVLOVSKIS(1) & ATHANASIOS ALEXAKIS(1)
ABSTRACT
Sediment transport, due to primarily the action of water, wind and ice, is one of the most significant geomorphic processes
responsible for shaping Earth¡¯s surface. It involves entrainment of sediment grains in rivers and estuaries due to the
violently fluctuating hydrodynamic forces near the bed. Here an instrumented particle, namely a ¡°smart pebble", is
developed to investigate the exact flow conditions under which individual grains may be entrained from the surface of a
gravel bed. This could lead in developing a better understanding of the processes involved, focusing on the response of
the particle during a variety of flow entrainment events. The ¡°smart pebble" is a particle instrumented with MEMS sensors
appropriate for capturing the hydrodynamic forces a coarse particle might experience during its entrainment from the
riverbed. A 3-axial gyroscope and accelerometer registers data to a memory card via a microcontroller, embedded in a
3D-printed waterproof hollow spherical particle. The instrumented board is appropriately fit and centered into the shell of
the pebble, so as to achieve a nearly uniform distribution of the mass which could otherwise bias its motion. The ¡°smart
pebble" is powered by an independent power to ensure autonomy and sufficiently long periods of operation appropriate for
deployment in the field. Post-processing and analysis of the acquired data is currently performed offline, using scientific
programming software. The performance of the instrumented particle is validated, conducting a series of calibration
experiments under well-controlled laboratory conditions.
File Size : 911,961 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 26/08/2015
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