Preprints
https://doi.org/10.5194/hess-2021-484
https://doi.org/10.5194/hess-2021-484

  28 Sep 2021

28 Sep 2021

Review status: this preprint is currently under review for the journal HESS.

Toward hyper-resolution global hydrological models including human activities: application to Kyushu Island, Japan

Naota Hanasaki1, Hikari Matsuda1, Masashi Fujiwara1, Yukiko Hirabayashi2, Shinta Seto3, Shinjiro Kanae4, and Taikan Oki5 Naota Hanasaki et al.
  • 1National Institute for Environmental Studies, Tsukuba, Japan
  • 2Shibaura Institute of Technology, Tokyo, Japan
  • 3Nagasaki University, Nagasaki, Japan
  • 4Tokyo Institute of Technology, Tokyo, Japan
  • 5University of Tokyo, Tokyo, Japan

Abstract. Global hydrological models that include human activities are powerful tools for assessing water availability and use at global and continental scales. Such models are typically applied at a spatial resolution of 30 arcminutes (approximately 50 km). In recent years, some 5-arcminute (9-km) applications have been reported, but with numerous technical challenges, including the validation of calculations for more than a million grid cells and the conversion of simulation results into meaningful information relevant to water resource management. Here, the H08 global water resources model was applied in two ways to Kyushu Island in Japan at resolution of 1 arcminute (2 km), and the detailed results were compared. One method involved feeding interpolated global meteorological and geographic data into the default global model (GLB; in accordance with previous high-resolution applications). For the other method, locally derived boundary conditions were input to the localized model (LOC; this method can be easily extended and applied to other regions, at least across Japan). The results showed that GLB cannot easily reproduce the historical record, especially for variables related to human activities (e.g., dam operation and water withdrawal). LOC is capable of estimating natural and human water balance components at daily time scales and providing reliable information for regional water resource assessment. The results highlight the importance of improving data preparation and modeling methods to represent water management and use in hyper-resolution global hydrology simulations.

Naota Hanasaki et al.

Status: open (until 23 Nov 2021)

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  • CC1: 'Short Comment on hess-2021-484', Luca Brocca, 30 Sep 2021 reply

Naota Hanasaki et al.

Data sets

Code and data of Toward hyper-resolution global hydrological models including human activities: application to Kyushu Island, Japan Naota Hanasaki https://zenodo.org/record/5523280

Model code and software

Code and data of Toward hyper-resolution global hydrological models including human activities: application to Kyushu Island, Japan Naota Hanasaki https://zenodo.org/record/5523280

Naota Hanasaki et al.

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Short summary
Global hydrological models (GHMs) are usually applied with a spatial resolution of about 50 km, but this time we applied the H08 model, one of the most advanced GHMs, with a high resolution of 2 km to Kyushu Island, Japan. Since the model was not accurate as it was, we incorporated local information and improved the model, which revealed detailed water stress in subregions that was not visible with the previous resolution.