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iRIC(international River Interface Cooperative)

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日本
Sapporo-shi, Hokkaido
iRIC(international River Interface Cooperative)

iRIC is a public-domain modeling interface and an associated group of open-source models that can be

iRIC is a public-domain modeling interface and an associated group of open-source models that can be used to simulate flow, sediment transport, channel and bank evolution and habitat in riverine environments across a wide range of temporal and spatial scales

23/07/2026

July 20–22, 2026

We participated in the IAHR-APD (International Association for Hydro-Environment Engineering and Research – Asia and Pacific Division Conference) held in Incheon, South Korea, where we exhibited the iRIC software at the exhibition booth. We also presented our latest research on Riemann invariants, which provide the theoretical foundation for a new boundary-condition formulation implemented in Cabernet2D, one of iRIC's newest solvers.

In addition, researchers from the Public Works Research Institute (PWRI) presented simulation results demonstrating the application of iRIC-Cabernet2D to complex river flows in the Kurobe River, including channel bifurcation/confluence and mixed subcritical–supercritical flow conditions.

Both the exhibition booth and the research presentations attracted considerable interest from conference participants, making the meeting an extremely rewarding and productive experience.

On a personal note, I was deeply honored to receive the Distinguished Member Award at the conference in recognition of my long-standing contributions to the IAHR community, as well as the international collaboration activities that my colleagues and I have promoted through the iRIC project. I would like to express my sincere gratitude to everyone who has supported these activities over the years.

2026年7月20日～22日,韓国仁川市において開催されたIAHR-APD(国際水理学会環太平洋地域大会)に iRICのブース展示、およびiRICの新しいソルバーであるCabernet2Dに新しい概念を用いた境界条件の理論的バックグランドであるRiemann不変量に関する研究発表と、iRICのブース展示を行ってきました。

研究発表では土木研究所のほうからも黒部川で行われた分合流・常射流を含む複雑流れに対してiRIC-Cabernet2Dを適用した計算結果の発表もありました。

ブース展示、研究発表共に大変多くの皆様に興味を持って頂き、大変有意義な学会参加になりました。

なお、私事ではありますが学会において長年の学会に対する貢献や、私共がiRIC活動を通じて行ってきた各国との国際交流活動に対して、大変名誉な功績賞を頂きました。すべて関係者も皆さまに心から感謝を申し上げます。

20/07/2026

We had distinguished guests at iRIC booth.

19/07/2026

Yes!
We are open, please visit us.

18/07/2026

July 16, 2026

I had the pleasure of giving an invited talk at the Study Group on Sediment Disasters Caused by Heavy Rainfall, held at the Nakanoshima Center of Osaka University.

This was the 13th meeting of the study group, which brings together leading experts from industry, academia, and government who are at the forefront of water- and sediment-related disaster management in the Kansai region. It is a highly active community dedicated to sharing knowledge and advancing research and practice.

Although I'm not entirely sure whether my presentation was exactly what the organizers had in mind, I once again introduced live demonstrations of Cabernet2D and Freebird, the two iRIC solvers that I have recently been promoting. Fortunately, the audience seemed to enjoy the iRIC demonstrations, and I was delighted to see such a positive response.

13/07/2026

On July 13, 2026, an iRIC-RRI Training Workshop, organized by the iRIC User Community (iRIC-UC), was held in Tokyo.

The instructor was Professor Daisuke Harada of the Faculty of Engineering and Design at Hosei University. The workshop introduced how to use RRI (Rainfall-Runoff-Inundation), developed by Professor Takahiro Sayama of Kyoto University, and RSR, a debris-flow and sediment-runoff model developed by Professor Harada, through the iRIC graphical user interface.

Approximately 10 participants attended the workshop in person, while around 60 joined online, resulting in a large and enthusiastic audience.

The workshop began with an explanation of the fundamental concepts behind the models and the procedures for obtaining the necessary input data. This was followed by a practical exercise using the Kurokawa River basin in Kyushu as a case study. The exercise demonstrated a complete watershed-scale analysis, including distributed rainfall, runoff and inundation simulation, debris-flow and sediment-runoff analysis, and calculations of flow, sediment transport, and riverbed evolution along a one-dimensional river network. It was truly an impressive all-in-one modeling system capable of representing virtually every major process occurring within a watershed on a single platform.

One of the most remarkable features was the ability to import rainfall data, topographic data, flow-direction data, and other information directly from web-based databases into the iRIC GUI. The entire process—from watershed and river-network delineation to the configuration of computational conditions, ex*****on of the simulation, and visualization of the results—could be carried out remarkably smoothly and efficiently. I was deeply impressed by the high level of completeness and ease of use of the iRIC-RRI and RSR models.

25/06/2026

On June 26, 2026, the Seminar on Large-Scale Monitoring and Analysis of River, Watershed, and Volcanic Hazards in Hokkaido under Climate Change was held at Muroran Institute of Technology. During the seminar, the latest developments in iRIC solvers were also introduced, making it a highly informative and valuable event.

21/06/2026

I created two open-levee (kasumi-tei) embankments in series along the river, making the upstream one slightly shorter. As a result, floodwater that cannot be fully stored in the upstream retention area spills downstream. However, by making the downstream open levee longer, not only can it accommodate this overflow, but it can also return the floodwater that arrived from the upstream retention area back to the main channel during the recession stage.

In the hydrograph above, the red line represents the inflow discharge entering from the upstream boundary, while the blue line represents the outflow discharge leaving through the downstream boundary. The flood-mitigation effect is as much as 20%. If this result is correct, the effectiveness of the open-levee system is truly remarkable!

18/06/2026

Today, while attending a conference in Tokyo, I came across a poster presentation on kasumi-tei (open levees) that caught my attention, so I tried reproducing a similar case with Cabernet2D.

今日東京で学会に参加したらポスターセッションで霞堤の検討に目を引かれましたので、私もCabernet2Dでやってみました。

住所

Sapporo-shi, Hokkaido