Compilation and evaluation of bedload transport rates made in ephemeral dryland channels around the world

We present an initial evaluation of sediment transport data collected from ephemeral channels in dryland regions worldwide. These data have been compiled from a wide range channels with differing watershed size, bed material, and aridity intensity. When these channels are activated, bedload transport rates are among the highest recorded anywhere. Their defining features - sparse vegetation cover, lack of baseflow, and unarmored nature - allows these channels to transport material highly efficiently downstream.

In this first evaluation, we have focused on

Comparing measurements of bedload transport in ephemeral channels to their perennial counterparts

Examining how differences in bed material affect transport efficiency

Determining how watershed characteristics (e.g., size, climate, and steepness) affect the transported material

Assessing the suitability of surrogate measurements for bedload transport

Ours is a first attempt to gather publicly available data from desert channels worldwide. Over 35% of the earth's landmass is classified as drylands. More than 2 billion people live in these regions. Our goal is to aggregate sediment transport data in the hope to resolve outstanding fundamental questions about how these channels behave and advance the knowledge about these under-studied fluvial systems.