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The Development of Hydraulic and Geomorphic Complexity in Recently Formed Streams in Glacier Bay National Park, Alaska

Klaar, Megan J. and Maddock, Ian and Milner, Alexander (2009) The Development of Hydraulic and Geomorphic Complexity in Recently Formed Streams in Glacier Bay National Park, Alaska. River Research and Applications. ISSN 1535-1467

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Abstract

Geomorphic and hydraulic complexity within five streams representing 200 years of stream development were examined in Glacier Bay National Park, Alaska. Channel geomorphic units (CGUs) were mapped using a hierarchical approach, which defined stream habitat according to morphological and hydraulic characteristics. Detailed hydraulic assessment within the geomorphic units allowed differences in hydraulic characteristics across the 200-year chronosequence to be documented. Channel geomorphology and hydrology changed as stream age increased. Younger streams were dominated by fast flowing geomorphic units such as rapids and riffles with little hydraulic or landscape diversity. As stream age increased, slower flowing habitat units such as glides and pools became more dominant, resulting in increased geomorphic, hydraulic and landscape diversity. These results suggest that geomorphic and hydraulic complexity develop over time, creating habitat features likely to be favoured by instream biota, enhancing biodiversity and abundance.

Item Type: Article
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Wiley InterScience Early View (Articles online in advance of print)

Uncontrolled Keywords: geomorphology, habitat heterogeneity, hydraulic diversity, stream age, HydroSignature
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
Q Science > Q Science (General)
G Geography. Anthropology. Recreation > GE Environmental Sciences
G Geography. Anthropology. Recreation > GB Physical geography
Divisions: Academic Departments > Institute of Science and the Environment
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Depositing User: Ian Maddock
Date Deposited: 13 Feb 2009 14:18
Last Modified: 15 Nov 2012 12:47
URI: https://eprints.worc.ac.uk/id/eprint/577

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