Development of a seamless hydrological model for seamless calculation between flooding and drought

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K23700
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0604:Agricultural economics and rural sociology, agricultural engineering, and related fields
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: MINAKAWA Hiroki 国立研究開発法人農業・食品産業技術総合研究機構, 農村工学研究部門, 主任研究員 (70527019)
• Project Period (FY): 2019-08-30 – 2021-03-31
• Keywords: 流域水管理 / 一体解析 / 洪水 / 渇水

Outline of Final Research Achievements

The purpose of this study was to develop a new hydrological model that can continuously calculate between flooding and normal, drought situation. Additionally, the model also aimed to get a function for considering flow situation in low-lying area. It was based on a existing distributed hydrological model developed by our team. Then, information on the main drainage line for agricultural area were added to reflect an effect of artificial flow in paddy area. Next, in the model, unsteady flow algorithm was newly introduced in the downstream area. Runoff from the mountain area was calculated by original model, and it was input to the downstream river channel as upstream boundary condition.
As a result, the new model satisfied the continuous calculation between flooding and normal period in target basin. However, peak of calculated discharge was underestimation compare with observed data. It is necessary to improve the model to use basin water management of the basin.

Free Research Field

農業水文学

Academic Significance and Societal Importance of the Research Achievements

洪水から渇水までを連続的に解析することを目指した本研究の進捗により、農業用水を中心とした流域水管理手法の開発のために必要な情報が提供可能になる。具体的には、将来の気候変動等を念頭においた潜在的な洪水・渇水のリスクの評価や、農家や施設管理を担う土地改良区が欲する豪雨時の災害予測情報、また、施設設計のための用・排水計画の必要情報等が挙げられる。