Small profile concavity of a fine-bed alluvial channel

Jongmin Byun, Kyungrock Paik

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Although most natural streams have concave-upward longitudinal profiles, there are conflicting perspectives about whether an alluvial channel is less concave than a bedrock channel. Alluvial channels can be classified as coarse-bed and fine-bed channels, depending on the bed grain size. Both are transport limited, but the threshold of motion differs greatly. Whereas a coarse-bed alluvial channel can be claimed to be as concave as a bedrock channel, we claim that a fine-bed channel is distinguishably less concave. We derive the concavity index of a fine-bed alluvial channel using the power-law relationships emergent at a steady-state river network. For known ranges of the scaling parameters, our formulation informs a range of concavity index as 0.07 ± 0.09 for a fine-bed alluvial channel. Our analyses of previous laboratory experiments and real fine-bed alluvial channels in the midwestern U.S. and northern Europe also support our conclusions, i.e., small profile concavity of steady-state fine-bed alluvial channels.

Original languageEnglish
Pages (from-to)627-630
Number of pages4
JournalGeology
Volume45
Issue number7
DOIs
Publication statusPublished - 2017 Jul 1

Fingerprint

bedrock
power law
grain size
river
index
parameter
laboratory experiment
Europe

ASJC Scopus subject areas

  • Geology

Cite this

Small profile concavity of a fine-bed alluvial channel. / Byun, Jongmin; Paik, Kyungrock.

In: Geology, Vol. 45, No. 7, 01.07.2017, p. 627-630.

Research output: Contribution to journalArticle

Byun, Jongmin ; Paik, Kyungrock. / Small profile concavity of a fine-bed alluvial channel. In: Geology. 2017 ; Vol. 45, No. 7. pp. 627-630.
@article{4a22f555fb2b46f19970872b610f9fea,
title = "Small profile concavity of a fine-bed alluvial channel",
abstract = "Although most natural streams have concave-upward longitudinal profiles, there are conflicting perspectives about whether an alluvial channel is less concave than a bedrock channel. Alluvial channels can be classified as coarse-bed and fine-bed channels, depending on the bed grain size. Both are transport limited, but the threshold of motion differs greatly. Whereas a coarse-bed alluvial channel can be claimed to be as concave as a bedrock channel, we claim that a fine-bed channel is distinguishably less concave. We derive the concavity index of a fine-bed alluvial channel using the power-law relationships emergent at a steady-state river network. For known ranges of the scaling parameters, our formulation informs a range of concavity index as 0.07 ± 0.09 for a fine-bed alluvial channel. Our analyses of previous laboratory experiments and real fine-bed alluvial channels in the midwestern U.S. and northern Europe also support our conclusions, i.e., small profile concavity of steady-state fine-bed alluvial channels.",
author = "Jongmin Byun and Kyungrock Paik",
year = "2017",
month = "7",
day = "1",
doi = "10.1130/G38879.1",
language = "English",
volume = "45",
pages = "627--630",
journal = "Geology",
issn = "0091-7613",
publisher = "Geological Society of America",
number = "7",

}

TY - JOUR

T1 - Small profile concavity of a fine-bed alluvial channel

AU - Byun, Jongmin

AU - Paik, Kyungrock

PY - 2017/7/1

Y1 - 2017/7/1

N2 - Although most natural streams have concave-upward longitudinal profiles, there are conflicting perspectives about whether an alluvial channel is less concave than a bedrock channel. Alluvial channels can be classified as coarse-bed and fine-bed channels, depending on the bed grain size. Both are transport limited, but the threshold of motion differs greatly. Whereas a coarse-bed alluvial channel can be claimed to be as concave as a bedrock channel, we claim that a fine-bed channel is distinguishably less concave. We derive the concavity index of a fine-bed alluvial channel using the power-law relationships emergent at a steady-state river network. For known ranges of the scaling parameters, our formulation informs a range of concavity index as 0.07 ± 0.09 for a fine-bed alluvial channel. Our analyses of previous laboratory experiments and real fine-bed alluvial channels in the midwestern U.S. and northern Europe also support our conclusions, i.e., small profile concavity of steady-state fine-bed alluvial channels.

AB - Although most natural streams have concave-upward longitudinal profiles, there are conflicting perspectives about whether an alluvial channel is less concave than a bedrock channel. Alluvial channels can be classified as coarse-bed and fine-bed channels, depending on the bed grain size. Both are transport limited, but the threshold of motion differs greatly. Whereas a coarse-bed alluvial channel can be claimed to be as concave as a bedrock channel, we claim that a fine-bed channel is distinguishably less concave. We derive the concavity index of a fine-bed alluvial channel using the power-law relationships emergent at a steady-state river network. For known ranges of the scaling parameters, our formulation informs a range of concavity index as 0.07 ± 0.09 for a fine-bed alluvial channel. Our analyses of previous laboratory experiments and real fine-bed alluvial channels in the midwestern U.S. and northern Europe also support our conclusions, i.e., small profile concavity of steady-state fine-bed alluvial channels.

UR - http://www.scopus.com/inward/record.url?scp=85020457488&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85020457488&partnerID=8YFLogxK

U2 - 10.1130/G38879.1

DO - 10.1130/G38879.1

M3 - Article

VL - 45

SP - 627

EP - 630

JO - Geology

JF - Geology

SN - 0091-7613

IS - 7

ER -