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  5. Parameter sensitivity of a watershed-scale flood forecasting model as a function of modelling time-step
 
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Parameter sensitivity of a watershed-scale flood forecasting model as a function of modelling time-step

Author(s)
O'Loughlin, Fiachra  
Bruen, Michael  
Wagener, Thorsten  
Uri
http://hdl.handle.net/10197/4223
Date Issued
2012-07-10
Date Available
2013-07-11T03:00:13Z
Abstract
Despite significant developments, the simple, lumped, conceptual, rainfall-runoff model is still widely used for flood forecasting. What may not be appreciated is that, while such models can often be calibrated to give reasonable forecasts of flood flows, both parameter values and the fluxes of water through individual model components change significantly with the time step used. This means that such models should be used with caution for studies which require “internal” information, such as hydrograph separation or water quality studies that depend on knowing the fluxes through individual flow routes through the model and in studies which try to relate parameter values to physical features of the catchment. To demonstrate this time-scale limitation, a parameter sensitivity analysis was performed on a typical lumped conceptual model (SMARG) applied to a small rural catchment on the Irish East Coast for a number of different time-steps, flow regimes and evaluation metrics. A global sensitivity analysis method (GUI-HDMR, is applied to calculate sensitivity indices which varied greatly with time-step and evaluation metric used. The sensitivity of parameters also differed for different flow regimes. Care should be taken in using internal information and calibrated parameter in conceptual models because of the strong dependence on time-step.
Type of Material
Journal Article
Publisher
IWA Publishing
Journal
Hydrology Research
Volume
44
Issue
2
Start Page
334
End Page
350
Copyright (Published Version)
2013, IWA Publishing
Subjects

Flood forecasting

Rainfall-runoff model...

Sensitivity analysis

SMARG

Time-step

DOI
10.2166/nh.2012.157
Language
English
Status of Item
Not peer reviewed
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
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HYDROLOGY-S-11-00079[1].pdf

Size

897.43 KB

Format

Adobe PDF

Checksum (MD5)

ff1047886442d7b1ff589fdc45dbb8c1

Owning collection
Civil Engineering Research Collection
Mapped collections
Centre for Water Resources Research Collection

Item descriptive metadata is released under a CC-0 (public domain) license: https://creativecommons.org/public-domain/cc0/.
All other content is subject to copyright.

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