Chapter
Apr 26, 2012
Changes in Aquatic Habitat and Geomorphic Response to Urbanization, with Implications for Assessing Habitat Degradation
Publication: World Environmental and Water Resources Congress 2007: Restoring Our Natural Habitat
Abstract
In 2004, an agricultural to urban land-cover gradient approach was used in a study of habitat and geomorphic responses to urbanization for 30 streams in Milwaukee and Green Bay, Wisconsin. Multiple scales of land-cover and landscape (reflecting glacial geologic setting) characteristics were compared to reach-scale habitat/geomorphic characteristics using correlation analysis. Urban streams had enlarged channels and more bank erosion than agricultural streams. However, geomorphic channel units and substrate characteristics mainly were related to subtle variations in reach slope. Hydrologic metrics, including flashiness, were of limited use for explaining habitat variations or geomorphic response. Bank stabilization, and historical channel modifications potentially confounded relations, emphasizing the need to recognize historical bank and channel stabilizations for site selection and habitat assessment. Studies of geomorphic processes and responses to the complex interaction of changes in watershed runoff and sediment with local geologic and anthropogenic controls would be needed to adequately predict habitat degradation associated with urbanization.
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© 2007 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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U.S. Geological Survey, 8505 Research Way, Middleton, WI 53562. E-mail: [email protected]
U.S. Geological Survey, 8505 Research Way, Middleton, WI 53562. E-mail: [email protected]
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