Characterisation of channel reach morphology and associated controls in deglaciated montane catchments in the Cairngorms, Scotland

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11 Citations (Scopus)

Abstract

The morphological characteristics of 50 channel reaches were surveyed in montane streams in the River Dee catchment to test an existing process-based typology. Included in the analysis were common reach types documented elsewhere (e.g., cascade, step-pool, and pool-riffle). In addition, mixed bedrock-alluvial, alluvial transitional, and wandering reach types (that have received less attention) were also investigated given their common occurrence in the study area. Differences in geometry, substrate character, and flow resistance are evident particularly between principal types, although differentiation of mixed bedrock-alluvial and transitional types was less marked. Wandering reaches occupy a slope range that overlaps with other types but are distinguished by a grain size distribution that is intermediate between plane-bed and pool-riffle reaches and a high channel width for a given discharge. The quantitative differences observed, support visually based differentiation of channel types based on their bedform assemblages. Morphological characteristics were also related to a suite of variables to determine first-order controls on reach type. Channel cross-sectional geometry is strongly correlated with discharge, whilst grain size and indices of flow resistance are strongly correlated with slope and boundary shear stress in particular. In addition, the paraglacially conditioned geomorphic setting constitutes an important local control. The morphological properties of common channel types (bedrock, cascade, step-pool, plane-bed, and pool-riffle) broadly correspond with those observed elsewhere, although channel slope ranges were markedly lower. We hypothesise that channel types exist in a lower domain of slope because of a lower sediment supply rate that reflects the distinctive landscape evolution of the Cairngorms area. (C) 2011 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)176-186
Number of pages11
JournalGeomorphology
Volume132
Issue number3-4
Early online date17 May 2011
DOIs
Publication statusPublished - 15 Sep 2011

Keywords

  • Channel morphology
  • Channel reach type
  • Montane catchments
  • Sediment supply
  • Transport capacity
  • Gravel-bed rivers
  • Spawning Atlantic salmon
  • Mountain Streams
  • Mesoscale catchment
  • Northeast Scotland
  • Landscape controls
  • Surface textures
  • Runoff Processes
  • Discharge use
  • Grain-size

Cite this

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title = "Characterisation of channel reach morphology and associated controls in deglaciated montane catchments in the Cairngorms, Scotland",
abstract = "The morphological characteristics of 50 channel reaches were surveyed in montane streams in the River Dee catchment to test an existing process-based typology. Included in the analysis were common reach types documented elsewhere (e.g., cascade, step-pool, and pool-riffle). In addition, mixed bedrock-alluvial, alluvial transitional, and wandering reach types (that have received less attention) were also investigated given their common occurrence in the study area. Differences in geometry, substrate character, and flow resistance are evident particularly between principal types, although differentiation of mixed bedrock-alluvial and transitional types was less marked. Wandering reaches occupy a slope range that overlaps with other types but are distinguished by a grain size distribution that is intermediate between plane-bed and pool-riffle reaches and a high channel width for a given discharge. The quantitative differences observed, support visually based differentiation of channel types based on their bedform assemblages. Morphological characteristics were also related to a suite of variables to determine first-order controls on reach type. Channel cross-sectional geometry is strongly correlated with discharge, whilst grain size and indices of flow resistance are strongly correlated with slope and boundary shear stress in particular. In addition, the paraglacially conditioned geomorphic setting constitutes an important local control. The morphological properties of common channel types (bedrock, cascade, step-pool, plane-bed, and pool-riffle) broadly correspond with those observed elsewhere, although channel slope ranges were markedly lower. We hypothesise that channel types exist in a lower domain of slope because of a lower sediment supply rate that reflects the distinctive landscape evolution of the Cairngorms area. (C) 2011 Elsevier B.V. All rights reserved.",
keywords = "Channel morphology, Channel reach type, Montane catchments, Sediment supply, Transport capacity, Gravel-bed rivers, Spawning Atlantic salmon, Mountain Streams, Mesoscale catchment, Northeast Scotland, Landscape controls, Surface textures, Runoff Processes, Discharge use, Grain-size",
author = "S. Addy and Christopher Soulsby and Hartley, {A. J.} and D. Tetzlaff",
year = "2011",
month = "9",
day = "15",
doi = "10.1016/j.geomorph.2011.05.007",
language = "English",
volume = "132",
pages = "176--186",
journal = "Geomorphology",
issn = "0169-555X",
publisher = "ELSEVIER SCIENCE BV",
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TY - JOUR

T1 - Characterisation of channel reach morphology and associated controls in deglaciated montane catchments in the Cairngorms, Scotland

AU - Addy, S.

AU - Soulsby, Christopher

AU - Hartley, A. J.

AU - Tetzlaff, D.

PY - 2011/9/15

Y1 - 2011/9/15

N2 - The morphological characteristics of 50 channel reaches were surveyed in montane streams in the River Dee catchment to test an existing process-based typology. Included in the analysis were common reach types documented elsewhere (e.g., cascade, step-pool, and pool-riffle). In addition, mixed bedrock-alluvial, alluvial transitional, and wandering reach types (that have received less attention) were also investigated given their common occurrence in the study area. Differences in geometry, substrate character, and flow resistance are evident particularly between principal types, although differentiation of mixed bedrock-alluvial and transitional types was less marked. Wandering reaches occupy a slope range that overlaps with other types but are distinguished by a grain size distribution that is intermediate between plane-bed and pool-riffle reaches and a high channel width for a given discharge. The quantitative differences observed, support visually based differentiation of channel types based on their bedform assemblages. Morphological characteristics were also related to a suite of variables to determine first-order controls on reach type. Channel cross-sectional geometry is strongly correlated with discharge, whilst grain size and indices of flow resistance are strongly correlated with slope and boundary shear stress in particular. In addition, the paraglacially conditioned geomorphic setting constitutes an important local control. The morphological properties of common channel types (bedrock, cascade, step-pool, plane-bed, and pool-riffle) broadly correspond with those observed elsewhere, although channel slope ranges were markedly lower. We hypothesise that channel types exist in a lower domain of slope because of a lower sediment supply rate that reflects the distinctive landscape evolution of the Cairngorms area. (C) 2011 Elsevier B.V. All rights reserved.

AB - The morphological characteristics of 50 channel reaches were surveyed in montane streams in the River Dee catchment to test an existing process-based typology. Included in the analysis were common reach types documented elsewhere (e.g., cascade, step-pool, and pool-riffle). In addition, mixed bedrock-alluvial, alluvial transitional, and wandering reach types (that have received less attention) were also investigated given their common occurrence in the study area. Differences in geometry, substrate character, and flow resistance are evident particularly between principal types, although differentiation of mixed bedrock-alluvial and transitional types was less marked. Wandering reaches occupy a slope range that overlaps with other types but are distinguished by a grain size distribution that is intermediate between plane-bed and pool-riffle reaches and a high channel width for a given discharge. The quantitative differences observed, support visually based differentiation of channel types based on their bedform assemblages. Morphological characteristics were also related to a suite of variables to determine first-order controls on reach type. Channel cross-sectional geometry is strongly correlated with discharge, whilst grain size and indices of flow resistance are strongly correlated with slope and boundary shear stress in particular. In addition, the paraglacially conditioned geomorphic setting constitutes an important local control. The morphological properties of common channel types (bedrock, cascade, step-pool, plane-bed, and pool-riffle) broadly correspond with those observed elsewhere, although channel slope ranges were markedly lower. We hypothesise that channel types exist in a lower domain of slope because of a lower sediment supply rate that reflects the distinctive landscape evolution of the Cairngorms area. (C) 2011 Elsevier B.V. All rights reserved.

KW - Channel morphology

KW - Channel reach type

KW - Montane catchments

KW - Sediment supply

KW - Transport capacity

KW - Gravel-bed rivers

KW - Spawning Atlantic salmon

KW - Mountain Streams

KW - Mesoscale catchment

KW - Northeast Scotland

KW - Landscape controls

KW - Surface textures

KW - Runoff Processes

KW - Discharge use

KW - Grain-size

U2 - 10.1016/j.geomorph.2011.05.007

DO - 10.1016/j.geomorph.2011.05.007

M3 - Article

VL - 132

SP - 176

EP - 186

JO - Geomorphology

JF - Geomorphology

SN - 0169-555X

IS - 3-4

ER -