Fang Zhao
The critical role of the routing scheme in simulating peak river discharge in global hydrological models
Zhao, Fang; Veldkamp, Ted I.E.; Frieler, Katja; Schewe, Jacob; Ostberg, Sebastian; Willner, Sven; Schauberger, Bernhard; Gosling, Simon N.; Schmied, Hannes M�ller; Portmann, Felix T.; Leng, Guoyong; Huang, Maoyi; Liu, Xingcai; Tang, Qiuhong; Hanasaki, Naota; Biemans, Hester; Gerten, Dieter; Satoh, Yusuke; Pokhrel, Yadu; Stacke, Tobias; Ciais, Philippe; Chang, Jinfeng; Ducharne, Agnes; Guimberteau, Matthieu; Wada, Yoshihide; Kim, Hyungjun; Yamazaki, Dai
Authors
Ted I.E. Veldkamp
Katja Frieler
Jacob Schewe
Sebastian Ostberg
Sven Willner
Bernhard Schauberger
Simon N. Gosling
Hannes M�ller Schmied
Felix T. Portmann
Guoyong Leng
Maoyi Huang
Xingcai Liu
Qiuhong Tang
Naota Hanasaki
Hester Biemans
Dieter Gerten
Yusuke Satoh
Yadu Pokhrel
Tobias Stacke
Philippe Ciais
Jinfeng Chang
Agnes Ducharne
Matthieu Guimberteau
Yoshihide Wada
Hyungjun Kim
Dai Yamazaki
Abstract
Global hydrological models (GHMs) have been applied to assess global flood hazards, but their capacity to capture the timing and amplitude of peak river discharge—which is crucial in flood simulations—has traditionally not been the focus of examination. Here we evaluate to what degree the choice of river routing scheme affects simulations of peak discharge and may help to provide better agreement with observations. To this end we use runoff and discharge simulations of nine GHMs forced by observational climate data (1971–2010) within the ISIMIP2a project. The runoff simulations were used as input for the global river routing model CaMa-Flood. The simulated daily discharge was compared to the discharge generated by each GHM using its native river routing scheme. For each GHM both versions of simulated discharge were compared to monthly and daily discharge observations from 1701 GRDC stations as a benchmark. CaMa-Flood routing shows a general reduction of peak river discharge and a delay of about two to three weeks in its occurrence, likely induced by the buffering capacity of floodplain reservoirs. For a majority of river basins, discharge produced by CaMa-Flood resulted in a better agreement with observations. In particular, maximum daily discharge was adjusted, with a multi-model averaged reduction in bias over about 2/3 of the analysed basin area. The increase in agreement was obtained in both managed and near-natural basins. Overall, this study demonstrates the importance of routing scheme choice in peak discharge simulation, where CaMa-Flood routing accounts for floodplain storage and backwater effects that are not represented in most GHMs. Our study provides important hints that an explicit parameterisation of these processes may be essential in future impact studies.
Citation
Zhao, F., Veldkamp, T. I., Frieler, K., Schewe, J., Ostberg, S., Willner, S., …Yamazaki, D. (2017). The critical role of the routing scheme in simulating peak river discharge in global hydrological models. Environmental Research Letters, 12(7), Article 075003. https://doi.org/10.1088/1748-9326/aa7250
Journal Article Type | Article |
---|---|
Acceptance Date | May 10, 2017 |
Publication Date | Jun 28, 2017 |
Deposit Date | Jun 29, 2017 |
Publicly Available Date | Mar 28, 2024 |
Journal | Environmental Research Letters |
Electronic ISSN | 1748-9326 |
Publisher | IOP Publishing |
Peer Reviewed | Peer Reviewed |
Volume | 12 |
Issue | 7 |
Article Number | 075003 |
DOI | https://doi.org/10.1088/1748-9326/aa7250 |
Keywords | ISIMIP, Global hydrological models, Peak river discharge, River routing, Flood, Daily runoff, GRDC |
Public URL | https://nottingham-repository.worktribe.com/output/869130 |
Publisher URL | https://doi.org/10.1088/1748-9326/aa7250 |
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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0
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