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- W2058449886 abstract "This paper aims to clarify the dependence existing between spatial rainfall organisation, basin morphology and runoff response. This is obtained by applying a spatial rainfall metric which describes the spatial rainfall organisation in terms of concentration and dispersion statistics as a function of the flow travel time measured along the river network. The metric is based on the observation that runoff routing through branched channel networks imposes an effective averaging of spatial rainfall excess at equal travel time, in spite of the inherent spatial variability. High resolution radar rainfall fields and a distributed hydrologic model are employed to examine how effective are these statistics in describing the degree of spatial rainfall organisation which is important for runoff modelling, and in quantifying the effects of neglecting the spatial rainfall variability on flood modelling. The investigation focuses on three extreme flash flood events occurred on the Carpathian range (Romania) in the period 2005–2007. The size of the study catchments ranges between 36 and 167 km2. The analysis reported here shows that neglecting the spatial rainfall variability results in a considerable loss of simulation Nash–Sutcliffe (NS) efficiency in almost 30% of the cases (NS less than 0.8), with NS less than 0.6 in one of the cases. This provides a significant documentation of the influence of the spatial rainfall variability on runoff modelling for catchment size less than 160 km2. Moreover, it is shown that these rainfall statistics, used in combination, are able to isolate and describe the features of rainfall spatial organisation which have significant impact on runoff simulation. An alternative rainfall spatial variability index, which is computed irrespective of flow travel time structure, provides a comparatively poor description of the influence of neglecting rainfall spatial variability on flood modelling. Overall, this implies that rainfall organisation measured along the river network by using the travel time coordinate may be a significant property of rainfall spatial variability when considering flood response modelling." @default.
- W2058449886 created "2016-06-24" @default.
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- W2058449886 date "2010-11-01" @default.
- W2058449886 modified "2023-10-01" @default.
- W2058449886 title "Which rainfall spatial information for flash flood response modelling? A numerical investigation based on data from the Carpathian range, Romania" @default.
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- W2058449886 doi "https://doi.org/10.1016/j.jhydrol.2010.07.019" @default.
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