iRIC(international River Interface Cooperative)

25/03/2026

On March 26, 2026, I visited the Hokkaido Research Organization. In the morning, I gave an overview lecture on iRIC, and in the afternoon, I conducted a workshop on flood analysis of small and medium-sized rivers in eastern Hokkaido, which are among the research targets of HRO.

In particular, during the afternoon workshop, I had the opportunity to interact with talented and highly motivated young researchers, which was truly inspiring and energizing for me as well. It was a very fulfilling day.

23/03/2026

3D flow over a thick object like a levee with a culvert.

21/03/2026

3D Numerical Simulation of Flow Over a Vertical Wall Obstacle with a Culvert using iRIC-Freebird.
The 3D solver Freebird in iRIC has been enhanced to allow the configuration of obstacle walls that include culverts.
https://www.youtube.com/watch?v=EVUraIi3bz4
This video shows a 3D simulation in which a vertical wall with a culvert is installed in the middle of a channel, and the discharge is gradually increased. Initially, the flow passes only through the culvert, but as the discharge increases, the simulation captures the transition to full overflow across the entire wall.

25/02/2026

iRICをご利用いただいている皆さまへ

平素よりiRICの活動に関心をお寄せいただき、誠にありがとうございます。

私たちは、水工学の基礎技術を大切にしながら、AI技術も積極的に取り込み、iRICの可能性を飛躍的に拡大するフェーズに入っています。
この変革期をリードし、iRICの「未来の形」を一緒に創っていく正社員メンバーを募集します。

少数精鋭のチームの一員として、高度な専門性を磨きながら、社会に貢献するプラットフォーム開発に携わってみませんか。

募集要項や業務内容の詳細については、下記よりご覧いただけます。

>>>募集詳細ページはこちら

オープンソース河川シミュレーションプラットフォーム iRIC の仲間を探しています。基礎を学び、AIを取り込み、iRICを進化させる挑戦を一緒にしませんか。

02/02/2026

Pictures of the iRIC seminar in Bangkok.

28-29 Jan 2026 at HII Bangkok Thai

29/01/2026

This week, we are holding an iRIC-related workshop at HII (Hydro Informatics Institute) in Bangkok, Thailand.

The workshop featured a rich and comprehensive program, including presentations on various research outcomes using iRIC and examples of its application to real sites, training sessions on data preparation for iRIC, and hands-on tutorials on running iRIC solvers.

https://i-ric.org/yasu/Thai2026/Agenda-iRIC2026.pdf

All participants were highly engaged, actively listening, discussing, and working through the practical exercises.

08/01/2026

Dear iRIC Users,

Happy New Year, and best wishes for another great year with iRIC.

We are pleased to announce that new promotional videos for our latest iRIC solvers are now available:

Cabernet2D — a general-purpose, multi-functional 2D solver for rivers, floodplains, and aquatic environments
https://youtu.be/RJ37AZrNkKM

Freebird — a powerful and versatile 3D flow solver
https://youtu.be/hPbazudc7S0

We hope you enjoy watching them.

- FreeBird is a three-dimensional open-channel flow model (based on Nays3dV as its core engine).- A non-hydrostatic model (with an optional hydrostatic mode)...

25/12/2025

24/12/2025

To all Cabernet2D trial users,
Based on the many bug reports and improvement requests we have received from you, we are pleased to announce the release of the Cabernet2D 2025 Christmas Edition, which includes numerous new features and enhancements.
We sincerely invite you to install this new version and continue testing it.

Cabernet2Dお試し版ユーザーの皆様：
皆様から頂いた沢山のバグ報告、改良要望を踏まえ、さらに様々な新機能も付加した形で2025年クリスマスバージョンを発表致しました。 是非ともインストール頂き、引き続き御試用頂き、バグ・不具合など報告頂ければ幸いです。

22/12/2025

On December 19, 2025, the iRIC-UC General Assembly was held at a venue in Tokyo. Despite the busy year-end season, nearly 30 participants gathered in person, with many others joining online.

The agenda included:
1. Opening Remarks by the Representative Director
2. Updates on iRIC Workshop (presented by Chairman Takebayashi)
3. Membership Status
4. Annual Membership Fees for the New Year
5. Term 8 Activity Report and Financial Statement
6. Activity Plan for Term 9
7. The iRIC Organizational Structure from Spring 2026 Onwards

The meeting saw spirited discussions, particularly regarding the activity reports and upcoming plans for the next term. A proposal for the new organizational structure starting next year was also introduced, raising high expectations for the further growth and revitalization of iRIC activities.

2025年12月19日、東京都内某所においてiRIC-UC総会が開催されました。年末の慌ただしい中会場には30名近い皆さんが集まって頂き、他オンラインでも沢山の皆様が参集して頂きました。
議題は、
１．代表理事挨拶
２．iRIC研究会の動き 竹林会長
３．会員状況
４．新年会費について
５．第8期活動実績と収支
６．第9期活動予定
７．2026年春以降のiRICの体制について
などで、特に活動報告や時期の活動計画について熱い議論が繰り広げられました。来年以降の新体制案についても披露があり、iRIC活動の益々の盛り上がりが期待されます。

19/12/2025

We presented at the Numerical Fluid Dynamics Symposium on a new feature implemented in Cabernet2D, a new solver in iRIC: a boundary condition formulation based on the concept of Riemann invariants.
This represents a groundbreaking new approach that breaks away from the conventional fixed paradigm of prescribing discharge at the upstream boundary and water level at the downstream boundary.
I encourage everyone to try Cabernet2D and experience this innovative capability.

iRICの新しいソルバー Cabernet2Dに搭載される新機能、Riemann不変量の概念を用いた境界条件について数値流体シンポジウムで発表を行いました。
今までの上流で流量、下流で水位という固定概念を打ち破る驚異的な新概念の導入です。皆様是非Cabenet2Dをお試し下さい。

18/12/2025

The iRIC pre-processor is equipped with a function to directly download USGS SRTM data
(a global digital elevation model (DEM) measured by radar instruments onboard a NASA Space Shuttle).
However, depending on the server environment, the download may not work properly.
In such cases, please download the required DEM data directly by following the procedure described at the site below:
https://qiita.com/yasu6888/items/9336a6cf2e70127702a5

iRICのプリプロセッサーにはUSGSのSRTMデータ[NASAのスペースシャトルに搭載されたレーダーで計測された地球規模のデジタル標高モデル(DEM)]を直接ダウンロードする機能が搭載されていますが、サーバー側の環境によってはうまくダウンロード出来ない場合があります。この場合は下記のサイトに説明する方法で必用なDEMデータを直接ダウンロードして下さい。
https://qiita.com/yasu6888/items/75cca3cb505e3209eea5