Last Update: Feb. 1st, 2019

Basic Hydraulic Experimental Facilities

2D Flow Channnel
2-Dimensional Flow Channel

@There are channels of various sizes with various accessories, which are needed for proposing and revising hydraulic design methods of river structures, studying habitats of river organisms, etc.

Large Scale Experimental Channel

High Drop Channel
High Drop Channel

@Studies that need full-scale experiments are conducted using the following three large channel models, which are largest in Japan.


Outdoor Model Experiment Facilities

Gokase River Model
Gokase River Model

@Reduced sized models of sections of rivers are constructed to experimentally investigate channel designs and problems related to the designs of river structures, such as weirs and revetment. Reduced sized models of sections of rivers are constructed to experimentally investigate channel designs and problems related to the designs of river structures, such as weirs and revetment.


Indoor Model Experimental Facilities (Under Renovation)

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Kariyata River Model

@Small ripples produced by wind on the surface of a model are huge waves of several meters when converted into an actual size, and thus phenomena shown in a model may differ from those in actual rivers. The facilities are covered with a 50m wide and 200m long roof to minimize the effects of wind. It is used for model experiments that need particularly precise water level measurements and for studying diverging points and river mouths. It is being renovated to create new models and undertake a case study of July 2017 Heavy Rain in Northern Kyushu.


Water Quality Analytical Lab.

Water Quality Analytical Lab.
Water Quality Analytical Lab.

@Rivers transport sediments, nutrients and toxic substances from land and flood plains together with water collected from the basin. The water quality analytical laboratory is equipped with various kinds of analytical instruments and refrigerators and analyzes substances contained in turbid water collected from several target rivers in Japan during floods.

Hinuma River Flood Observatory (Removed in 2018)

Hinuma River Flood Observatory
Hinuma River Flood Observatory

@The observatory was located at 28.1 km point on the Hinuma River of the Naka River System. It consisted of a 30m span support constructed across the low-flow channel, a 15m span elevating stage on the support, and an inspection bridge. The elevating stage was on the low-flow channel and moved vertically within a range of 6 m to facilitate flowing water to be observed from a short distance even during a flood. The observatory terminated its operation and removed in 2018.

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