![]() ![]() A sensitivity analysis found that a 500 m reach segmentation length produced reasonable agreement with manual, categorical, expert‐derived analysis of confinement. ![]() Comparison of manually digitized and mapped with modelled calculations of confinement revealed that roughly 1/3 of reaches were equivalent and about 2/3 of the sites differ by less than ☑5%. To test the reliability of calculating confinement across entire networks, we applied our geoprocessing scripts across four physiographically distinct watersheds of the Pacific Northwest, USA using freely available national datasets. The valley bottom is occupied by the contemporary floodplain and/or its channel(s) confining margins can be any landform or feature that makes up the valley bottom margin, such as bedrock hillslopes, terraces, fans, or anthropogenic features such as stopbanks or constructed levees. At the reach scale, valley bottom confinement is measured and quantified as the ratio of the length of channel confined on either bank by a confining margin divided by the reach length. Confinement is a useful metric for characterizing and discriminating valley setting. In this paper, we demonstrate the application of a continuous confinement metric across entire river networks.
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