Preprints
https://doi.org/10.5194/hess-2021-532
https://doi.org/10.5194/hess-2021-532

  02 Dec 2021

02 Dec 2021

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

Inclusion of flood diversion canal operation in the H08 hydrological model with a case study from the Chao Phraya River Basin – Part 1: Model development and validation

Saritha Padiyedath Gopalan1, Adisorn Champathong2, Thada Sukhapunnaphan2, Shinichiro Nakamura3, and Naota Hanasaki1 Saritha Padiyedath Gopalan et al.
  • 1Centre for Climate Change Adaptation, National Institute for Environmental Studies (NIES), 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
  • 2Royal Irrigation Department, 811 Samsen Road, Dusit, Bangkok, Thailand
  • 3Royal Department of Civil Engineering, Graduate School of Engineering, Nagoya University, Building No. 9, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

Abstract. Water diversion systems play crucial roles in assuaging flood risk by diverting and redistributing water within and among basins. For flood and drought assessments, including investigations of the effects of diversion systems on river discharge worldwide, the explicit inclusion of these systems into global hydrological models (GHMs) is essential. However, such representation remains in the pioneering stage because of complex canal operations and insufficient data. Therefore, we developed a regionalized canal operation scheme and implemented it in the H08 GHM for flood diversion in the Chao Phraya River Basin (CPRB), Thailand, which is a complex river network with several natural and man-made diversion canals and has been subject to severe flooding in the past, including recent years.

Region-specific validation results revealed that the enhanced H08 model with the regionalized diversion scheme could effectively simulate the observed flood diversion pattern in the CPRB. Diverted water comprises approximately 49 % of the annual average river discharge in the CPRB. The simulations further confirmed that the presented canal scheme had the potential to reduce flood risk in the basin by significantly reducing the number of flooding days. A generalized canal scheme with simple input data settings was also constructed for future global applications, providing insights into the maximum level of discharge reduction achievable with diversion of nearly 57 % of the annual average river discharge of the CPRB. Overall, the enhanced H08 model with canal schemes can be adapted and applied to different contexts and regions, accounting for the characteristics of each river network by maintaining the basic principles unaltered.

Saritha Padiyedath Gopalan et al.

Status: open (until 09 Feb 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2021-532', Anonymous Referee #1, 08 Jan 2022 reply
  • RC2: 'Comment on hess-2021-532', Anonymous Referee #2, 11 Jan 2022 reply

Saritha Padiyedath Gopalan et al.

Saritha Padiyedath Gopalan et al.

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Short summary
The modeling of diversion canals using hydrological models are important because they play crucial roles in water management. Therefore, we developed a simplified canal diversion scheme and implemented it into the H08 global hydrological model. The developed diversion scheme was validated in the Chao Phraya River basin, Thailand. Region-specific validation results revealed that the H08 model with the diversion scheme could effectively simulate the observed flood diversion pattern in the basin.