Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/5495
Title: Channel classification across arid west landscapes in support of OHW delineation
Authors: Lefebvre, Lindsey E.
Lichvar, Robert
Curtis, Katherine E.
Gillrich, Jennifer J.
Keywords: Arid West
Western United States
Arid regions
Channel classification
Ephemeral channels
Intermittent channels
Watersheds
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: ERDC/CRREL ; TR-13-3
Abstract: The Arid West region is dominated by watersheds that have a high frequency of intermittent and ephemeral channels. These channels are influenced by watershed characteristics and the local hydrologic regime, which dictate the amount of sediment deposited and eroded in the channel. Over time, this sediment movement causes the geometry of the channel and the surrounding floodplain to evolve. For this study, 14 mountain, 18 foothill, and 17 basin ephemeral and intermittent channels within multiple watersheds were evaluated for specific characteristics, including geology, slope, watershed design, and floodplain geomorphology. We used multivariate analyses to explore patterns of similarities and differences among the channel and watershed characteristics. Using these results and characteristics, a simple, artificial channel classification to evaluate OHW indicators was devised to better understand watershed and intermittent and ephemeral channels across the landscape in the Arid West region. A total of 18 channel types were classified: 4 in the mountains, 8 in the foothills, and 6 in the basins. Our findings demonstrate that watershed and channel characteristics vary considerably across the landscape in the Arid West, suggesting that channel classification is potentially useful for evaluating the variability of occurrence of OHW indicators at a larger scale.
Description: Technical Report
Gov't Doc #: ERDC/CRREL TR-13-3
Rights: Approved for Public Release; Distribution is Unlimited.
URI: http://hdl.handle.net/11681/5495
Size: 80 pages/4.80 Mb
Appears in Collections:Technical Report

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