Journal
ENVIRONMENTAL MODELLING & SOFTWARE
Volume 153, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envsoft.2022.105408
Keywords
Hillslope curvature; Geospatial tools; Overland flow; Rational method; Design flow; Hillslope width function
Categories
Funding
- National Science Foundation's Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt) [EEC-1028968]
- National Science Foundation [EAR-1013339, EAR-BSF1632494]
- Hellman Foundation
- Gledden Foundation at the University of Western Australia's Institute for Advanced Studies
- University of California, Berkeley
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This study presents Arc Hydro tools to analyze the properties of hillslope curvature and its impact on peak flows. The results show that hillslope curvature can increase peak flow predictions by up to a factor of 3. This suggests that hillslope curvature plays an important role in hydrological processes on real landscapes.
Hillslopes are a fundamental unit of surface hydrology, mediating the flow of water to fluvial networks through overland flow and subsurface pathways. We present Arc Hydro tools to delineate hillslope outlines, identify hillslope width functions and implement an overland flow model that accounts for hillslope curvature. We apply the new tool to subwatersheds in the Walnut Gulch Experimental Watershed and Las Trampas Creek Watershed to investigate properties of hillslope curvature and impact of curvature on peak flows. We found that, for these two subwatersheds, divergent, convergent, and uniform-width hillslopes account for 43%, 55%, and 2% of subwatershed areas, respectively. This curvature is substantial enough to increase peak flow predictions by up to a factor of 3 on some hillslopes, and can be exaggerated at larger scales as multiple hillslope hydrographs are superimposed. Our findings suggest that hillslope curvature may play an important role in hydrological processes on real landscapes.
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