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Beyond Impervious: Urban Land-Cover Pattern Variation and Implications for Watershed Management

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Abstract

Impervious surfaces degrade urban water quality, but their over-coverage has not explained the persistent water quality variation observed among catchments with similar rates of imperviousness. Land-cover patterns likely explain much of this variation, although little is known about how they vary among watersheds. Our goal was to analyze a series of urban catchments within a range of impervious cover to evaluate how land-cover varies among them. We then highlight examples from the literature to explore the potential effects of land-cover pattern variability for urban watershed management. High-resolution (1 m2) land-cover data were used to quantify 23 land-cover pattern and stormwater infrastructure metrics within 32 catchments across the Triangle Region of North Carolina. These metrics were used to analyze variability in land-cover patterns among the study catchments. We used hierarchical clustering to organize the catchments into four groups, each with a distinct landscape pattern. Among these groups, the connectivity of combined land-cover patches accounted for 40 %, and the size and shape of lawns and buildings accounted for 20 %, of the overall variation in land-cover patterns among catchments. Storm water infrastructure metrics accounted for 8 % of the remaining variation. Our analysis demonstrates that land-cover patterns do vary among urban catchments, and that trees and grass (lawns) are divergent cover types in urban systems. The complex interactions among land-covers have several direct implications for the ongoing management of urban watersheds.

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Acknowledgments

We thank the National Science Foundation for their support of this research through the Triangle, NC, Urban Long Term Research Area—exploratory award (BCS-0948229). We thank Gary Blank, Kayleigh Somers, Heather Cheshire, Emily Bernhardt, Kevin Bigsby, and Sarah Bruce for their various contributions to this project. The cities of Raleigh, Durham, and Chapel Hill/Carrboro helped immensely through the sharing of spatial data and resources.

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Correspondence to Scott M. Beck.

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Beck, S.M., McHale, M.R. & Hess, G.R. Beyond Impervious: Urban Land-Cover Pattern Variation and Implications for Watershed Management. Environmental Management 58, 15–30 (2016). https://doi.org/10.1007/s00267-016-0700-8

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  • DOI: https://doi.org/10.1007/s00267-016-0700-8

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