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Article

Impact of Climate and Geology on Event Runoff Characteristics at the Regional Scale

1
Centre for Water Resource System, TU Wien, Karlsplatz 13, A-1040 Vienna, Austria
2
Institute of Hydraulic Engineering and Water Resources Management, TU Wien, Karlsplatz 13, A-1040 Vienna, Austria
3
Department of Land and Water Resources Management, Faculty of Civil Engineering, Slovak University of Technology in Bratislava, Radlinského 11, 810 05 Bratislava, Slovakia
4
Polytechnico di Torino, Department of Environment, Land and Infrastructure Engineering, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3457; https://doi.org/10.3390/w12123457
Received: 11 November 2020 / Revised: 4 December 2020 / Accepted: 7 December 2020 / Published: 9 December 2020
The dynamics of flood event characteristics, such as the runoff coefficient and the recession time constant, differ in time and space, due to differences in climate, geology, and runoff generation mechanisms. This study examines the variability of event runoff characteristics and relates them to climatic and hydro-geological characteristics available at the regional scale. The main focus is to examine the role of rainfall patterns (i.e., event precipitation volume, precipitation intensity, and antecedent precipitation) and runoff regime (i.e., initial flow before runoff event and event duration) characteristics on the seasonal dynamics of runoff response. The analysis is performed in four small Austrian catchments representing different hydro-geological settings obtained by field mapping. The results are based on an analysis of 982 runoff events identified from hourly measurements of streamflow and precipitation in the period 2002 to 2013. The results show that larger event runoff coefficients and flow peaks are estimated in catchments with high mean annual precipitation than in drier catchments. In contrast to some previous studies, the results show only poor relation between antecedent precipitation (as an index of catchment wetness) and event runoff response. The initial flow is found to be the main factor influencing the magnitude of runoff coefficient and event peaks in all analyzed catchments and geological settings. The recession time constant tends to be inversely related to the maximum event precipitation intensity, with an exception for one catchment (Wimitzbach), which is characterized by the largest proportion of deep interflow contribution to runoff. The analysis of the runoff response by different event types indicates that runoff coefficients and recession time constants are the largest for snowmelt runoff events. View Full-Text
Keywords: event runoff coefficient; event recession time constant; hydro-geological field mapping; regional scale event runoff coefficient; event recession time constant; hydro-geological field mapping; regional scale
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MDPI and ACS Style

Chen, X.; Parajka, J.; Széles, B.; Valent, P.; Viglione, A.; Blöschl, G. Impact of Climate and Geology on Event Runoff Characteristics at the Regional Scale. Water 2020, 12, 3457. https://doi.org/10.3390/w12123457

AMA Style

Chen X, Parajka J, Széles B, Valent P, Viglione A, Blöschl G. Impact of Climate and Geology on Event Runoff Characteristics at the Regional Scale. Water. 2020; 12(12):3457. https://doi.org/10.3390/w12123457

Chicago/Turabian Style

Chen, Xiaofei; Parajka, Juraj; Széles, Borbála; Valent, Peter; Viglione, Alberto; Blöschl, Günter. 2020. "Impact of Climate and Geology on Event Runoff Characteristics at the Regional Scale" Water 12, no. 12: 3457. https://doi.org/10.3390/w12123457

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