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A Framework for Evaluating the Spatial Configuration and Temporal Dynamics of Hydraulic Patches

Wallis, Caroline and Maddock, Ian and Visser, Fleur and Acreman, Mike (2011) A Framework for Evaluating the Spatial Configuration and Temporal Dynamics of Hydraulic Patches. River Research and Applications. ISSN 1535-1467

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Abstract

A framework for evaluating the spatial configuration and temporal dynamics of hydraulic patches was tested in a UK lowland river. Detailed hydraulic assessment was carried out at four discharges between 0.303m3/s and 1.410m3/s in a 56m reach. Five hydraulic patches, as combinations of depth and mean column velocity, and the transitional zones between them were delineated using fuzzy cluster analysis. The composition and configuration of the hydraulic patch mosaic was quantified using spatial metrics. Results showed that the proportion, size, shape and relative location of hydraulic patches all varied with discharge, however intermediate flows appeared to support the most diverse hydraulic patch composition and configuration. This suggests the spatial influence of mesoscale bedforms on hydraulic patches is mediated by temporal variations in discharge. Transitional areas between hydraulic patches occupied a significant proportion of the reach at all flows (33–38%) and may function as in-stream ecotones. The framework addresses the need for a quantitative, spatially explicit approach to hydraulic assessment which could be used to assess the implications of flow regulation and hydromorphological alteration on hydraulic diversity.

Item Type: Article
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Uncontrolled Keywords: hydraulic heterogeneity, patch dynamics, discharge, fuzzy cluster analysis
Subjects: Q Science > Q Science (General)
G Geography. Anthropology. Recreation > GB Physical geography
Divisions: Academic Departments > Institute of Science and the Environment
Depositing User: Ian Maddock
Date Deposited: 07 Jun 2011 13:15
Last Modified: 07 Jun 2011 13:15
URI: https://eprints.worc.ac.uk/id/eprint/1355

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