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Intercomparison of global river discharge simulations focusing on dam operation --- Part II: Multiple models analysis in two case-study river basins, Missouri-Mississippi and Green-Colorado

Masaki, Yoshimitsu; Hanasaki, Naota; Biemans, Hester; Müller Schmied, Hannes; Tang, Qiuhong; Wada, Yoshihide; Gosling, Simon; Takahashi, Kiyoshi; Hijioka, Yasuaki

Authors

Yoshimitsu Masaki

Naota Hanasaki

Hester Biemans

Hannes Müller Schmied

Qiuhong Tang

Yoshihide Wada

Simon Gosling

Kiyoshi Takahashi

Yasuaki Hijioka



Abstract

We performed a twofold intercomparison of river discharge regulated by dams under multiple meteorological forcings among multiple global hydrological models for a historical period by simulation. Paper II provides an intercomparison of river discharge simulated by five hydrological models under four meteorological forcings. This is the first global multimodel intercomparison study on dam-regulated river flow. Although the simulations were conducted globally, the Missouri-Mississippi and Green-Colorado Rivers were chosen as case-study sites in this study. The hydrological models incorporate generic schemes of dam operation, not specific to a certain dam. We examined river discharge on a longitudinal section of river channels to investigate the effects of dams on simulated discharge, especially at the seasonal time scale. We found that the magnitude of dam regulation differed considerably among the hydrological models. The difference was attributable not only to dam operation schemes but also to the magnitude of simulated river discharge flowing into dams. That is, although a similar algorithm of dam operation schemes was incorporated in different hydrological models, the magnitude of dam regulation substantially differed among the models. Intermodel discrepancies tended to decrease toward the lower reaches of these river basins, which means model dependence is less significant toward lower reaches. These case-study results imply that, intermodel comparisons of river discharge should be made at different locations along the river’s course to critically examine the performance of hydrological models because the performance can vary with the locations.

Journal Article Type Article
Journal Environmental Research Letters
Electronic ISSN 1748-9326
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 12
Issue 5
Article Number 055002
APA6 Citation Masaki, Y., Hanasaki, N., Biemans, H., Müller Schmied, H., Tang, Q., Wada, Y., …Hijioka, Y. (in press). Intercomparison of global river discharge simulations focusing on dam operation --- Part II: Multiple models analysis in two case-study river basins, Missouri-Mississippi and Green-Colorado. Environmental Research Letters, 12(5), doi:10.1088/1748-9326/aa57a8. ISSN 1748-9326
DOI https://doi.org/10.1088/1748-9326/aa57a8
Publisher URL http://iopscience.iop.org/article/10.1088/1748-9326/aa57a8
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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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/3.0





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