Quantification of intense transport of fractions of stratified bimodal bed load based on measured distributions of velocity and concentration

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F25%3A00385615" target="_blank" >RIV/68407700:21110/25:00385615 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.5194/egusphere-egu25-8700" target="_blank" >https://doi.org/10.5194/egusphere-egu25-8700</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5194/egusphere-egu25-8700" target="_blank" >10.5194/egusphere-egu25-8700</a>

Result language

angličtina

Original language name

Quantification of intense transport of fractions of stratified bimodal bed load based on measured distributions of velocity and concentration

Original language description

We present the results of laboratory experiments investigating the intense transport of bimodal bed load under high bed shear conditions in a tilting flume. Particles of two lightweight sediment fractions, differing in size, tend to separate during transport above the plane surface of an eroded mobile bed. Coarser fraction particles are predominantly present in the collisional layer above the bed, while finer fraction particles are primarily concentrated in the interfacial layer, which develops between the eroded bed and the collisional layer. This observed stratification of transported fractions influences their respective contributions to the total bed load discharge through the flume. Vertical distributions of local velocity and volumetric concentration were measured across the flow depth for each fraction separately, allowing the determination of each fraction's proportion in the total discharge. The experimental results were combined with a previously collected dataset to compare the discharges of bimodal and unimodal sediments under hydraulically similar conditions. Additionally, the experimentally determined discharges were evaluated against predictions from transport models designed for intense unimodal and bimodal bed loads.

Czech name

—

Czech description

—

Type

O - Miscellaneous

CEP classification

—

OECD FORD branch

20101 - Civil engineering

Project

<a href="/en/project/GA23-07772S" target="_blank" >GA23-07772S: Structure and dynamics of multi-species bed load transport above erodible plane bed in open channel</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů