HR: 1340h
AN: H43E-1670    [Abstracts]
TI: Investigating the spatial variability of hillslope flow velocities in the Width-Function
AU: * Petroselli, A
EM: petro@unitus.it
AF: GEMINI Department, University of Tuscia, via S. Camillo de Lellis snc, Viterbo, 01100, Italy
AU: Santini, M
EM: monia.santini@unitus.it
AF: DiSAFRi Department, University of Tuscia, via S. Camillo de Lellis snc, Viterbo, 01100, Italy
AU: Santini, M
EM: monia.santini@unitus.it
AF: Honors Center of Italian Universities (H2CU), University of Rome La Sapienza, via Eudossiana 18, Rome, 00184, Italy
AU: Nardi, F
EM: fernando.nardi@unitus.it
AF: GEMINI Department, University of Tuscia, via S. Camillo de Lellis snc, Viterbo, 01100, Italy
AU: Nardi, F
EM: fernando.nardi@unitus.it
AF: Honors Center of Italian Universities (H2CU), University of Rome La Sapienza, via Eudossiana 18, Rome, 00184, Italy
AU: Grimaldi, S
EM: salvatore.grimaldi@unitus.it
AF: GEMINI Department, University of Tuscia, via S. Camillo de Lellis snc, Viterbo, 01100, Italy
AU: Grimaldi, S
EM: salvatore.grimaldi@unitus.it
AF: Honors Center of Italian Universities (H2CU), University of Rome La Sapienza, via Eudossiana 18, Rome, 00184, Italy
AU: Vivoni, E R
EM: vivoni@nmt.edu
AF: Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Leroy Place 801, Socorro, NM 87801, United States
AB: The width function (WF) i.e. the fraction of points/area at the same distance to the outlet measured along the downhill flow path is an important river basin and stream network parameter for hydrogeomorphic applications. Weighted WF, obtained rescaling the hydrologic travel distances with the corresponding surface flow velocity strengthens the physical concept with particular regard to the implementation of the rainfall-runoff WF-based instantaneous unit hydrograph (WFIUH). The basic assumption for obtaining the rescaled WF of assigning a different velocity to hillslope cells as respect to channel cells has already proven to positively enforce the geomorphic physical concept improving the timing and the behavior/shape of the river basin hydrologic response. In this context the natural spatial variability of hydraulic conditions (velocity) within the different hydrogeomorphic features has never been broadly investigated. Aim of this work is to investigate the impact of WF rescaled using spatial distribution of hillslope flow velocities linked to the different terrain morphologic (slope, curvature) and land use properties (vegetation, soil type).
DE: 1821 Floods
DE: 1839 Hydrologic scaling
DE: 1846 Model calibration (3333)
DE: 1847 Modeling
SC: Hydrology [H]
MN: 2007 Fall Meeting