Influence of schematization detailness on the results of rainfall-runoff modelling in the Lubina river basin

Abstract

This paper, in a form of a case study, deals with the influence of detailed basin schematization on the results of rainfall-runoff modelling. Three schematizations with dissimilar details were created for the study area and subsequently a rainfall-runoff simulation was carried out by means of the HEC-HMS programme for a precipitation event. Resulting hydrographs were further compared with a real discharge measured in the closing profile of the model basin. The model basin is the Lubina River basin occupying c. 160 km2, characterized by significant altitudinal articulation and variable land use, so the comparison was not limited to one landscape type. The study also includes statistical evaluation of model accuracy by means of the Nash-Sutcliffe method. Finally, the results are discussed as well as probable reasons for the behaviour of the models.