A morphological comparison of narrow,low-gradient streams traversing wetland environments to alluvial streams |
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Authors: | Jurmu Michael C |
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Institution: | (1) Department of Geography & Geology, University of Wisconsin–Fond du Lac, 400 University Drive, Fond du Lac, Wisconsin, USA 54935, US |
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Abstract: | Twelve morphological features from research on alluvial streams are compared in four narrow, low-gradient wetland streams
located in different geographic regions (Connecticut, Indiana, and Wisconsin, USA). All four reaches differed in morphological
characteristics in five of the features compared (consistent bend width, bend cross-sectional shape, riffle width compared
to pool width, greatest width directly downstream of riffles, and thalweg location), while three reaches differed in two comparisons
(mean radius of curvature to width ratio and axial wavelength to width ratio). The remaining five features compared had at
least one reach where different characteristics existed. This indicates the possibility of varying morphology for streams
traversing wetland areas further supporting the concept that the unique qualities of wetland environments might also influence
the controls on fluvial dynamics and the development of streams. If certain morphological features found in streams traversing
wetland areas differ from current fluvial principles, then these varying features should be incorporated into future wetland
stream design and creation projects. The results warrant further research on other streams traversing wetlands to determine
if streams in these environments contain unique morphology and further investigation of the impact of low-energy fluvial processes
on morphological development. Possible explanations for the morphology deviations in the study streams and some suggestions
for stream design in wetland areas based upon the results and field observations are also presented. |
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Keywords: | : Stream morphology Form ratio Cross section Radius of curvature Pools and riffles Thalweg Fluvial dynamics |
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