Morphology of boulder-bed semi-alluvial channel beds: a flume study modelling streams in northern Fennoscandia
type: Dataset
description: In northern Fennoscandia, semi-alluvial boulder-bed channels with coarse glacial legacy sediment are abundant and due to widespread anthropogenic manipulation during timber-floating, unimpacted reference reaches are rare. The landscape context of these semi-alluvial rapids— with numerous mainstem lakes that buffer high flows and sediment connectivity in addition to low sediment yield— contribute to low amounts of fine sediment and incompetent flows to transport boulders. To determine the morphodynamics of semi-alluvial rapids and potential self-organization of sediment with multiple high flows, a flume experiment was designed and carried out to mimic conditions in semi-alluvial rapids in northern Fennoscandia. Two slope setups (2% and 5%) were used to model a range of flows (Q1, Q2, Q10 & Q50) in a 8 x 1.1 m flume with a sediment distribution analogous to field conditions; bed topography was measured using structure-from-motion photogrammetry (SfM) after each flow to obtain digital elevation models (DEMs). Ground-based LiDAR was used to obtain control points needed to create the SfM-based DEMs. The DEMs have a resolution of 5 x 5 mm; separate DEMs are shown for initial conditions at each slope and after each flow. Exported sediment after the 2% slope flows was replaced into the flume and the bed was mixed to create similar initial plane bed conditions before the 5% slope flows as with the 2% slope setup. Shapefiles of digitized grains > D84 are also included. These were created based on the initial conditions for each slope separately. Analyses of the DEMs were done by creating DEMs-of-difference (DODs) by subtracting DEMs from one another to obtain elevation changes. These elevation changes were analyzed for the entire flume an in relation to >D84 grains. Results of these analyses have implications for restoration of gravel spawning beds in northern Fennoscandia and highlight the importance of large grains in understanding channel morphodynamics. A mobile-bed physi…
conditions of access: http://publications.europa.eu/resource/authority/access-right/PUBLIC
conditions of access: info:eu-repo/semantics/openAccess
creative work status: completed
  type: DefinedTerm
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  term code: COMPLETED
creator: Lina Polvi
date modified: 2020-10-21
date published: 2020-10-21
funding: Grant
  funder: Swedish Research Council Formas
language: English
is part of: https://doi.org/10.5878/j3cf-h812
keywords: Physical Geography
  type: DefinedTerm
  term code: 10507
keywords: Oceanography, Hydrology and Water Resources
  type: DefinedTerm
  term code: 10509
keywords: watercourse
publisher: Umeå University
spatial coverage: Sweden
spatial coverage: Västernorrland County
spatial coverage: Jämtland Province
spatial coverage: Norrbotten Province
spatial coverage: Västerbotten Province
spatial coverage: Finland
temporal coverage: 2015-08-01/2015-09-01
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version: 1

PropertyValue
property ID: DOI
value: 10.5878/kz4r-6y69

Lina Polvi
type: Person
affiliation: Umeå University
family name: Polvi
given name: Lina

Umeå University
type: Organization
department: Department of Ecology and Environmental Science

English
type: Language
alternate name: eng

RIVERS/STREAMS
type: DefinedTerm
description: River: A large, natural freshwater surface stream having a permanent seasonal flow and moving toward a sea, lake, or another river in a definite channel. Stream: A body of running water moving under the influence of gravity to lower levels in a narrow, clearly defined natural channel.

watercourse
type: DefinedTerm
description: A natural stream arising in a given drainage basin but not wholly dependent for its flow on surface drainage in its immediate area, flowing in a channel with a well-defined bed between visible banks or through a definite depression in the land, having a definite and permanent or periodic supply of water, and usually, but not necessarily, having a perceptible current in a particular direction and discharging at a fixed point into another body of water.
term code: 9161

Sweden
type: Place

Västernorrland County
type: Place

Finland
type: Place