Impact of remotely sensed land-cover proportions on urban runoff prediction

Tomas Berezowski, Jaroslaw Chormanski, Okke Batelaan, Frank Canters, Tim Van de Voorde

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)

    Abstract

    Land-cover impacts volume, intensity and contamination of runoff generated by rainfall events in catchments. This study demonstrates how the method used for estimation of land-cover proportions impacts the runoff from a distributed, physically based hydrological model-WetSpa. The study area is the urbanized catchment of Biala River, situated in the northeastern part of Poland. Three scenarios of landcover proportion estimation were tested: a semi-distributed approach where the average proportion of impervious surface cover per land-use type is estimated based on hard classification of a high-resolution IKONOS scene and two distributed approaches with land-cover class proportions estimated at the level of individual cells based on hard classification of a high-resolution IKONOS scene and sub-pixel classification of a medium-resolution Landsat 5 TM scene respectively. Validation of the three scenarios based on a comparison of modeled versus observed discharge shows that best results are obtained for the two distributed scenarios with a Nash-Sutcliffe efficiency (NS) of 0.62 for the hard classification approach and NS = 0.63 for the sub-pixel approach. The hard classification approach performed best in the estimation of peak discharges. The semi-distributed modeling scenario resulted in the lowest simulation efficiency (NS = 0.40) and did not perform well in estimating observed peak discharges. It is concluded that scenarios in which land-cover proportions are distributed improved considerably the simulation results of hydrological processes in physically based models.

    Original languageEnglish
    Pages (from-to)54-65
    Number of pages12
    JournalInternational Journal of Applied Earth Observation and Geoinformation
    Volume16
    Issue number1
    DOIs
    Publication statusPublished - 2012

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