Publication Abstracts

Zhao et al. 2017

Zhao, F., T.I.E. Veldkamp, K. Frieler, J. Schewe, S. Ostberg, S. Willner, B. Schauberger, S.N. Gosling, H.M. Schmied, F.T. Portmann, G. Leng, M. Huang, X. Liu, Q. Tang, N. Hanasaki, H. Biemans, D. Gerten, Y. Satoh, Y. Pokhrel, T. Stacke, P. Ciais, J. Chang, A. Ducharne, M. Guimberteau, Y. Wada, H. Kim, and D. Yamazaki, 2017: The critical role of the routing scheme in simulating peak river discharge in global hydrological models. Environ. Res. Lett., 12, no. 7, 075003.

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. %PY 2017

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BibTeX Citation

@article{zh07200b,
  author={Zhao, F. and Veldkamp, T. I. E. and Frieler, K. and Schewe, J. and Ostberg, S. and Willner, S. and Schauberger, B. and Gosling, S. N. and Schmied, H. M. and Portmann, F. T. and Leng, G. and Huang, M. and Liu, X. and Tang, Q. and Hanasaki, N. and Biemans, H. and Gerten, D. and Satoh, Y. and Pokhrel, Y. and Stacke, T. and Ciais, P. and Chang, J. and Ducharne, A. and Guimberteau, M. and Wada, Y. and Kim, H. and Yamazaki, D.},
  title={The critical role of the routing scheme in simulating peak river discharge in global hydrological models},
  year={2017},
  journal={Environ. Res. Lett.},
  volume={12},
  number={7},
  pages={075003},
}

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RIS Citation

TY  - JOUR
ID  - zh07200b
AU  - Zhao, F.
AU  - Veldkamp, T. I. E.
AU  - Frieler, K.
AU  - Schewe, J.
AU  - Ostberg, S.
AU  - Willner, S.
AU  - Schauberger, B.
AU  - Gosling, S. N.
AU  - Schmied, H. M.
AU  - Portmann, F. T.
AU  - Leng, G.
AU  - Huang, M.
AU  - Liu, X.
AU  - Tang, Q.
AU  - Hanasaki, N.
AU  - Biemans, H.
AU  - Gerten, D.
AU  - Satoh, Y.
AU  - Pokhrel, Y.
AU  - Stacke, T.
AU  - Ciais, P.
AU  - Chang, J.
AU  - Ducharne, A.
AU  - Guimberteau, M.
AU  - Wada, Y.
AU  - Kim, H.
AU  - Yamazaki, D.
PY  - 2017
TI  - The critical role of the routing scheme in simulating peak river discharge in global hydrological models
JA  - Environ. Res. Lett.
VL  - 12
IS  - 7
SP  - 075003
ER  -

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