HR: 1340h
AN: H43G-1699    [Abstracts]
TI: A computational algorithm for hillslope partitioning from DEMs and digitized river networks
AU: * Rousseau, A N
EM: alain.rousseau@ete.inrs.ca
AF: INRS-ETE, 490 de la Couronne, Quebec, QC G1K 9A9, Canada
AU: Paul, L
EM: ludovic.paul@engees.u-strasbg.fr
AF: INRS-ETE, 490 de la Couronne, Quebec, QC G1K 9A9, Canada
AU: Paniconi, C
EM: claudio.paniconi@ete.inrs.ca
AF: INRS-ETE, 490 de la Couronne, Quebec, QC G1K 9A9, Canada
AB: A computational algorithm has been developed for delineating and parameterizing hillslopes from digital terrain models of watersheds or relatively homogeneous hydrological units (RHHUs). The derived hillslopes can be characterized according to slope, plan shape, profile curvature, width function, and other parameters needed in hillslope-focused hydrological field and modeling studies. The procedure begins by dividing the RHHUs into either two or three hillslopes, the latter case representative of a headwater unit. The plan shape and profile curvature can be computed using either a binary or a fuzzy logic approach. The width function calculation integrates two different methods of interpolation, depending on the presence or not of a headwater hillslope. Different criteria, such as total area matching, are used to guide and assess the delineation process. In contrast to other partitioning algorithms (e.g., LandMapR software), the proposed method can be integrated directly into PHYSITEL, a watershed GIS, and can thus work with RHHUs derived from this tool, i.e., within a hydrological unit framework.
DE: 1800 HYDROLOGY
DE: 1804 Catchment
DE: 1850 Overland flow
SC: Hydrology [H]
MN: 2007 Fall Meeting