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

Zhao, F., Veldkamp, T., Frieler, K., Schewe, J., Ostberg, S., Willner, S., Schauberger, B., Gosling, S., Müller Schmied, H., Portmann, F., Leng, G., Huang, M., Liu, X., Tang, Q., Hanasaki, N., Biemans, H., Gerten, D., Satoh, Y., Pokhrel, Y., Stacke, T., Ciais, P., Ducharne, A., Guimberteau, M., Wada, Y., Kim, H., Yamazaki, D. (2017): The critical role of the routing scheme in simulating peak river discharge in global hydrological models. - Environmental Research Letters, 12, 7, 075003.
https://doi.org/10.1088/1748-9326/aa7250

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Zhao, Fang1, Autor              
Veldkamp, T.2, Autor
Frieler, Katja1, Autor              
Schewe, Jacob1, Autor              
Ostberg, Sebastian1, Autor              
Willner, Sven1, Autor              
Schauberger, Bernhard1, Autor              
Gosling, S.2, Autor
Müller Schmied, H.2, Autor
Portmann, F.2, Autor
Leng, G.2, Autor
Huang, M.2, Autor
Liu, X.2, Autor
Tang, Q.2, Autor
Hanasaki, N.2, Autor
Biemans, H.2, Autor
Gerten, Dieter1, Autor              
Satoh, Y.2, Autor
Pokhrel, Y.2, Autor
Stacke, T.2, Autor
Ciais, P.2, AutorDucharne, A.2, AutorGuimberteau, M.2, AutorWada, Y.2, AutorKim, H.2, AutorYamazaki, D.2, Autor mehr..
Affiliations:
1Potsdam Institute for Climate Impact Research, ou_persistent13              
2External Organizations, ou_persistent22              

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 Zusammenfassung: 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.

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 Datum: 2017
 Publikationsstatus: Final veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1088/1748-9326/aa7250
PIKDOMAIN: Climate Impacts & Vulnerabilities - Research Domain II
PIKDOMAIN: Earth System Analysis - Research Domain I
eDoc: 7628
Research topic keyword: Freshwater
Model / method: Model Intercomparison
Regional keyword: Global
Organisational keyword: RD2 - Climate Resilience
Organisational keyword: RD1 - Earth System Analysis
Working Group: Terrestrial Safe Operating Space
Working Group: Adaptation in Agricultural Systems
Working Group: Numerical analysis of global economic impacts
 Art des Abschluß: -

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Titel: Environmental Research Letters
Genre der Quelle: Zeitschrift, SCI, Scopus, p3, oa
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Seiten: - Band / Heft: 12 (7) Artikelnummer: 075003 Start- / Endseite: - Identifikator: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/150326