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Ben-Gurion University of the Negev (2016)

Use of passive acoustic sensors for monitoring bedload transport in a semi-arid environment - Nahal Eshtemoa

Paz, Dror,

Titre : Use of passive acoustic sensors for monitoring bedload transport in a semi-arid environment - Nahal Eshtemoa

שימוש בחיישנים אקוסטיים לניטור תנועת גרופת באזור צחיח למחצה - נחל אשתמוע.

Auteur : Paz, Dror,

Etablissement de soutenance : Ben-Gurion University of the Negev

Grade : Master of Arts (MA) 2016

Résumé
Bedload research station exists in Nahal Eshtemoa for two decades. In recent years two acoustic systems for indirect bedload monitoring were introduced to the station – the Swiss plate geophones and the Japanese pipe hydrophones. During 2012-2013 four flow events were monitored using ‘Reid’ bed load samplers, as well as the two new systems. Although the results are inconclusive, the acoustic systems did not display good enough indications to bedload flux, and are not yet ripe to replace direct samplers, such as the ‘Reid’ slot samplers, at least in such semi-arid environments as studied here. The acoustic sensors did demonstrate capabilities in detecting bedload transport, as well as rough estimates to bedload flux. Due to low number of flow events, characteristic to this region, insufficient data were collected to obtain conclusive results. This study also displays a novel method for mass-based data aggregation, instead of the common time-based aggregation. Thanks to developments in logging equipment, as well as increase in computer power, this new method allows more accurate data gathering in variety of flow regimes, while using the existing sensors. This new method allows calculation of very low bedload fluxes (0.001 kg/sm) that hitherto could not be undertaken with a fixed time-base. It also allows precise calculation of very high bedload fluxes with the sensors presently deployed in the system.

Présentation et version intégrale (PRIMO)

Page publiée le 9 janvier 2022