Spatio-temporal variations on alluvial fan channel width in response to grain size on the channel bed under constant upstream boundary conditions.

ABSTRACT: It has been widely accepted that channel geometry on alluvial fans is predominantly controlled by upstream boundary conditions and remains stable if those conditions do not change. This study challenges that notion by examining how channel width on alluvial fans varies in space and time under constant upstream conditions. Experiments using a sediment mixture (sand and crushed walnut) with constant sediment and water discharge rates reveal distinct patterns in channel width. In lower water discharge runs, total channel width decreases over time, while in higher discharge runs, it increases. Theoretical principles suggest that channel width is inversely proportional to grain size. Sand results in a wider channel width compared to walnut sediment, making its proportion along the channel a key

SUBMITTER: Shin H 

PROVIDER: S-EPMC11954856 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature