HR: 0830h
AN: H51B-04    [Abstracts]
TI: Area-slope Threshold Value Assessment for Drainage Network Recognition in the Framework of Rainfall Runoff Modelling
AU: * Giannoni, F
EM: francesca.giannoni@arpal.org
AF: CIMA - Centro di Ricerca Interuniversitario in Monitoraggio Ambientale, Universit… di Genova e Universit… della Basilicata, Via Cadorna 7, Savona, 17100 Italy
AU: * Giannoni, F
EM: francesca.giannoni@arpal.org
AF: CMIRL - Agenzia Regionale per l'Ambiente Ligure, Piazza della Vittoria 15/C, Genova, 16121 Italy
AU: Roth, G
EM: giorgio@cima.unige.it
AF: CIMA - Centro di Ricerca Interuniversitario in Monitoraggio Ambientale, Universit… di Genova e Universit… della Basilicata, Via Cadorna 7, Savona, 17100 Italy
AU: Roth, G
EM: giorgio@cima.unige.it
AF: DIST - dipartimento di informatica, Sistemistica e Telematica, Universit… di Genova, via all'Opera Pia 23, Genova, 16100 Italy
AU: Rudari, R
EM: rr@cima.unige.it
AF: CIMA - Centro di Ricerca Interuniversitario in Monitoraggio Ambientale, Universit… di Genova e Universit… della Basilicata, Via Cadorna 7, Savona, 17100 Italy
AU: Rudari, R
EM: rr@cima.unige.it
AF: DIST - dipartimento di informatica, Sistemistica e Telematica, Universit… di Genova, via all'Opera Pia 23, Genova, 16100 Italy
AB: The estimate of model's parameters is a central feature for the application of rainfall runoff models. The applicability of a GIUH-based network response model is conditioned by the identification of the proper drainage network. Among the various filtering criteria that can be found in the literature for channel recognition from digital elevation models, the one using contributing area slope shows interesting features. Nevertheless, the area-slope criterion has been poorly applied, mainly because of the difficulties in objectively defining the appropriate threshold values. In this work, a structured approach to assess the area-slope threshold value is proposed within the hydrologic applications perspective. The resulting channel network is then used as input to a semi-distributed, event-based rainfall-runoff model able to describe severe rainfall events in small, steep basins. This model accounts for network and hillslope contributions to the total dispersion in the routing process, a key factor in determining the main features of the hydrologic response. In a geomorphologically homogeneous region, the set of model parameters shows interesting invariance properties with respect to storm and basin characteristics.
DE: 1818 Evapotranspiration
DE: 1824 Geomorphology (1625)
DE: 1860 Runoff and streamflow
DE: 1866 Soil moisture
SC: Hydrology [H]
MN: 2005 Joint Assembly