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Table 1 Primary and secondary topographic attributes of hillslopes (Bogaart and Troch, 2006; Huggett, 2007)

From: Surface storm flow prediction on hillslopes based on topography and hydrologic connectivity

Topographical attributes Description Correlations
Altitude Height above reference point Indicator for climate variables (temperature, precipitation), vegetation, and soil patterns
Slope Change in elevation (1st derivative of elevation), steepness of terrain Indicator of soil depth, wildland fire spread, overland flow velocity, and subsurface flow velocity
Aspect Compass direction (azimuth) of the steepest slope Solar insolation and irradiance, vegetation patterns, evapotranspiration, ecosystem differentiation
Hillslope length Length between foot and peak Amount of sediment supply for erosion
Profile (slope) curvature Rate of change in slope (2nd derivative of elevation) Overland flow acceleration, moisture patterns, erosion and deposition rates
Plan (contour) curvature Rate of change of aspect (1st derivative of aspect) Converging and diverging flow path, gully erosion, alluvial fans
Wetness index where A u is the local upstream contributing area and β is the local slope Moisture and vegetation patterns