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Alternative Approaches to a Calibration of Rainfall- Runoff Models for a Flood Frequency Analysis

Alternative Approaches to a Calibration of Rainfall- Runoff Models for a Flood Frequency Analysis DOI: 10.2478/aslh-2014-0012 Acta Silv. Lign. Hung., Vol. 10, Nr. 2 (2014) 161–174 Alternative Approaches to a Calibration of Rainfall- Runoff Models for a Flood Frequency Analysis Peter VALENT – Ján SZOLGAY – Roman VÝLETA Department of Land and Water Resources Management, Faculty of Civil Engineering, Slovak University of Technology, Bratislava, Slovakia Abstract – One of the tools which are currently being used in flood frequency analysis (FFA) is rainfall-runoff (RR) modelling. Its use in FFA often confronts the problem of how to correctly calibrate RR models to extreme flows. Since FFA only deals with extreme flows, traditional calibration techniques using simple objective functions such as the Nash-Sutcliffe model’s efficiency criterion are not sufficient. In this paper we have focused on proposing alternative approaches for calibration techniques of RR models in order to enhance the description of extreme flows. We have selected the HBV type conceptual, lumped model HRON as an RR model. We have suggested two alternative calibration approaches: 1) the use of a new optimization function that compares only values higher than the 95th percentile of observed flows and 2) using two sets of parameters to separately simulate low and high flows. Each of these improvements has enhanced http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Silvatica et Lignaria Hungarica de Gruyter

Alternative Approaches to a Calibration of Rainfall- Runoff Models for a Flood Frequency Analysis

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de Gruyter
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ISSN
1787-064X
DOI
10.2478/aslh-2014-0012
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Abstract

DOI: 10.2478/aslh-2014-0012 Acta Silv. Lign. Hung., Vol. 10, Nr. 2 (2014) 161–174 Alternative Approaches to a Calibration of Rainfall- Runoff Models for a Flood Frequency Analysis Peter VALENT – Ján SZOLGAY – Roman VÝLETA Department of Land and Water Resources Management, Faculty of Civil Engineering, Slovak University of Technology, Bratislava, Slovakia Abstract – One of the tools which are currently being used in flood frequency analysis (FFA) is rainfall-runoff (RR) modelling. Its use in FFA often confronts the problem of how to correctly calibrate RR models to extreme flows. Since FFA only deals with extreme flows, traditional calibration techniques using simple objective functions such as the Nash-Sutcliffe model’s efficiency criterion are not sufficient. In this paper we have focused on proposing alternative approaches for calibration techniques of RR models in order to enhance the description of extreme flows. We have selected the HBV type conceptual, lumped model HRON as an RR model. We have suggested two alternative calibration approaches: 1) the use of a new optimization function that compares only values higher than the 95th percentile of observed flows and 2) using two sets of parameters to separately simulate low and high flows. Each of these improvements has enhanced

Journal

Acta Silvatica et Lignaria Hungarica – de Gruyter

Published: Dec 1, 2014

Keywords: Life Sciences; Plant Science

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