Abstract
A map of land use/cover (LULC) can be the starting point for producing a parameter map of overland hydraulic roughness. However, interpretation is important since land use/cover categories must be interpreted to yield a hydraulic parameter that governs the relationship between runoff depth and velocity. Despite what the map classification indicates, a more important aspect is the hydraulic roughness that runoff experiences as it flows over the land surface typical of a particular land use/cover classification. Modeling surface runoff assumes that the derived hydraulic parameters are representative of the land use/cover, at least as a starting point for calibration. Channel roughness will be seen to differ markedly from overland flow roughness coefficients and should be assigned based on channel characteristics rather than LULC. Deriving hydraulic roughness coefficients from land use classification schemes is the theme of this chapter.
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Vieux, B.E. (2016). Hydraulic Roughness. In: Distributed Hydrologic Modeling Using GIS. Water Science and Technology Library, vol 74. Springer, Dordrecht. https://doi.org/10.1007/978-94-024-0930-7_6
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