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  The critical role of the routing scheme in simulating peak river discharge in global hydrological models

Zhao, F., Veldkamp, T. I. E., Frieler, K., Schewe, J., Ostberg, S., Willner, S., et al. (2017). The critical role of the routing scheme in simulating peak river discharge in global hydrological models. Environmental Research Letters, 12: 075003. doi:10.1088/1748-9326/aa7250.

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 Creators:
Zhao, Fang1, Author
Veldkamp, Ted I. E.1, Author
Frieler, Katja1, Author
Schewe, Jacob1, Author
Ostberg, Sebastian1, Author
Willner, Sven1, Author
Schauberger, Bernhard1, Author
Gosling, Simon N.1, Author
Schmied, Hannes Mueller1, Author
Portmann, Felix T.1, Author
Leng, Guoyong1, Author
Huang, Maoyi1, Author
Liu, Xingcai1, Author
Tang, Qiuhong1, Author
Hanasaki, Naota1, Author
Biemans, Hester1, Author
Gerten, Dieter1, Author
Satoh, Yusuke1, Author
Pokhrel, Yadu1, Author
Stacke, Tobias2, Author                 
Ciais, Philippe1, AuthorChang, Jinfeng1, AuthorDucharne, Agnes1, AuthorGuimberteau, Matthieu1, AuthorWada, Yoshihide1, AuthorKim, Hyungjun1, AuthorYamazaki, Dai1, Author more..
Affiliations:
1external, ou_persistent22              
2Terrestrial Hydrology, The Land in the Earth System, MPI for Meteorology, Max Planck Society, ou_913560              

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Free keywords: CLIMATE-CHANGE; FLOOD HAZARD; CONTINENTAL-SCALE; INTEGRATED MODEL; DIRECTION MAP; AMAZON BASIN; RUNOFF; PRECIPITATION; WETLANDS; SYSTEMSISIMIP; global hydrological models; peak river discharge; river routing; flood; daily runoff; GRDC;
 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. CaMaFlood 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.

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Language(s): eng - English
 Dates: 2017-06-282017-06-28
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: ISI: 000404943800003
DOI: 10.1088/1748-9326/aa7250
 Degree: -

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Project name : Helix BMBF - grant no. 01LS1201A1 and 01LS1201A2
Grant ID : 603864-2
Funding program : Funding Programme 7 (FP7)
Funding organization : European Commission (EC)

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Title: Environmental Research Letters
  Abbreviation : Environ. Res. Lett.
Source Genre: Journal
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Publ. Info: Bristol : Institute of Physics
Pages: - Volume / Issue: 12 Sequence Number: 075003 Start / End Page: - Identifier: ISSN: 1748-9326
CoNE: https://pure.mpg.de/cone/journals/resource/1748-9326