2021 CSDMS meeting-011

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Sagy Cohen  choose to not submit an abstract for this conference.

jaia Syvitski, University of Colorado Boulder Colorado, United States.

Bedload flux is notoriously challenging to measure and model. The dynamics of this sediment transport mechanisms therefore remains largely unknown in most fluvial systems worldwide. That is despite its important role in geomorphological, ecological and engineering functions of rivers, reservoirs and costal systems. We present a global scale bedload flux model as part of the WBMsed hydro-geomorphic modelling framework. The model is the first spatially and temporally explicit model of bedload at a global scale. While offering fairly coarse and first-order estimate of bedload flux, it allows us to study large scale universal dynamics and it offer a pathway for alleviating the acute scarcity in bedload flux data. Here we test a variety of bedload equations and analyze the importance of particle size, water discharge, river slope and stream power on the model predictive quality. We also analyze the dynamics between suspended sediment and bedload dynamics along major rivers and their controls.