title: Improving Distributed Runoff Prediction in Urbanized Catchments with Remote Sensing based Estimates of Impervious Surface Cover.
abstract: The amount and intensity of runoff on catchment scale are strongly determinedby the presence of impervious land-cover types, which are the predominant cover types inurbanized areas. This paper examines the impact of different methods for estimatingimpervious surface cover on the prediction of peak discharges, as determined by a fullydistributed rainfall-runoff model (WetSpa), for the upper part of the Woluwe Rivercatchment in the southeastern part of Brussels. The study shows that detailed informationon the spatial distribution of impervious surfaces, as obtained from remotely sensed data,produces substantially different estimates of peak discharges than traditional approachesbased on expert judgment of average imperviousness for different types of urban land use.The study also demonstrates that sub-pixel estimation of imperviousness may be a usefulalternative for more expensive high-resolution mapping for rainfall-runoff modelling atcatchment scale.
authors.affiliation: Warsaw Agricultural University, Department of Hydraulic Structures and Environmental Restoration, Warsaw, Poland. j.chormanski@levis.sggw.pl.
authors.forename: Jaroslaw
authors.initials: J
authors.lastname: Chormanski
authors.affiliation: Vrije Universiteit Brussel, Cartography and GIS Research Unit, Department of Geography, Brussels, Belgium. tvdvoord@vub.ac.be.
authors.forename: Tim
authors.initials: T
authors.lastname: Van de Voorde
authors.affiliation: Vrije Universiteit Brussel, Cartography and GIS Research Unit, Department of Geography, Brussels, Belgium. tim.de.roeck@vub.ac.be.
authors.forename: Tim
authors.initials: T
authors.lastname: De Roeck
authors.affiliation: Vrije Universiteit Brussel, Department of Hydrology and Hydraulic Engineering, Brussels, Belgium. batelaan@vub.ac.be.
authors.forename: Okke
authors.initials: O
authors.lastname: Batelaan
authors.affiliation: Vrije Universiteit Brussel, Cartography and GIS Research Unit, Department of Geography, Brussels, Belgium. fcanters@vub.ac.be.
authors.forename: Frank
authors.initials: F
authors.lastname: Canters
keywords: distributed runoff modeling; impervious surfaces; remote sensing; sub-pixel classification