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INTERPRAEVENT International Symposium 2018

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One day study tour will be made to the site where the massive collapse of a mountain occurred triggered by “Hietsu Great Earthquake” (1858), and then to the sites where sediment disasters occurred due to collapse of a natural dam and measures were undertaken thereafter to prevent such disasters to take place again in the future. 

A study tour to Kurobe Gorge and other places is arranged for the accompanying persons. 

Ex. 1 Earthquake, Sediment Disaster, and Historical Sabo Course (Participants: 80)

1.Overview of the Inspection Course

This course includes inspection visits of sediment-related disasterscaused by earthquakes
 in the Joganji River, sabo projects, andhistorical sabo facilities, such as the Shiraiwa Sabo
 Dams, centeringon the Tateyama Caldera.

The visit will include riding a tramcar,which was originally used to transport materials
 for the Tateyamasabo works.

The course includes a visit to the Tateyama Caldera Sabo Museum, whichhas displays
 and exhibits on the nature, history, and sabo projectsof the upper reaches of the Joganji
 River centering on the Tateyama Caldera.

1st  tour Ex1-180112-English.pdf  Ex1-180112-Japanese.pdf

Ex. 2 Steep River Management Course (Participants: 80)
1.Overview of the Inspection Course

The course includes visits to the Tateyama Caldera Sabo Museum, which has displays and 
exhibits on the nature, history, and sabo projectscentering on the Tateyama Caldera;
 inspection of facilities in the midstream reach such as the Hongu Sabo Dam, Yokoe
Headworks, and the downstream facilities; and discussion on measures for steep river
management of the Joganji River.

2nd tour Ex2-180112-English.pdf  Ex2-180112-Japanese.pdf


Ex. 3 Comprehensive Sediment Control Course (Participants: 20)
1.Overview of the Inspection Course 

The Kurobe River is characterized by remarkable discharge of sediments from the upstream
denuded land and a well-developed alluvial fan with discharged sediments. It is one of Japan’s
steepest rivers, with agradient of about 1/5 to 1/80 in the mountainous area and about 1/100in 
the alluvial area.

The course involves a field inspection of the sabo projects in theupstream reach of the Kurobe
River (Kuronagi River basin) (which hasthe aforementioned features), dams along the Kurobe
River, andgeneral sediment control covering those facilities and coastal areas.

3rd tour Ex3-180112-English.pdf  Ex3-180112-Japanese.pdf

Ex. 4 Volcano Disaster and Volcanic Area Sabo Course (Participants: 20)
1.Overview of the Inspection Course

Thegeology of the Takahara River basin is fragile. The ground in theNorth Japan Alps is
said to upheave 4 to 5 mm every year by orogeny.Because of this unstable geologic structure,
the river basin ischaracterized by its remarkable production of sediment. One of the major
focuses of this course is the Hirayu River basin, where denudedland is formed by thick
deposits of volcanic ejecta from active volcanoes including Mt. Yakedake. The course includes 
study of thiscondition from topographic and geologic viewpoints.

Mt.Yakedake is still an active volcano that has been exhibiting volcanic activity recently,
including steam explosions. The Mt. Yakedake Eruption Control Measures Council conducts
observation and measurement, and reviews various measures for eruption disaster
management. The focus of inspection is the Council’s swift and effective implementation of
urgent measures, including both structural and nonstructural measures against sediment
disasters following volcanic eruption to mitigate disaster damage.

This course also includes an explanation to participants on parameters including the rate of 
flow, sediment discharge, and sediment production continuously observed by the Hodaka
Sedimentation Observatory, Research Center for Fluvial and Coastal Disasters,Disaster
Prevention Research Institute, Kyoto University; a visit to the observatory of the Shin-Hodaka
Ropeway for sightseeing in the mountain area, including a panoramic view of the Hidaka
Mountain Range (North Japan Alps); and the opportunity to experience the blessings of the
volcano (hot spring footbaths).

4th tour Ex4-180112-English.pdf  Ex4-180112-Japanese.pdf

Ex. 5 Toyama Culture and Sightseeing Course (Participants: 20 or more)
1.Overview of the Inspection Course (subjects and themes of fieldvisits and important points of

Toyama Prefecture is surrounded by mountains on three sides and by the Seaof Japan on
the remaining side. The prefecture has a rich naturallandscape, with a large difference in
altitude of 4,000 m, rangingfrom mountains of 3,000 m in height to sea depths of 1,000
meters ina distance of 50 km. There are also many rivers on steep slopes and composite
alluvial plains. It is also located almost at the center of Japan. This has helped Toyama to
develop a variety of culturalcharacteristics as a place of fusion or contact among eastern and
western cultures for many centuries. In particular, the western partof the prefecture has rich
cultural heritage, including the Zuiryu-jiTemple (which was nurtured by the Kaga Clan and
is now designated asa national treasure), and a village of rafter-roof (
) colony,designated as a World Heritage Site.

This course includes visits to sites of world heritage and nationaltreasures in the western
part of the prefecture, as well as an iron foundry, representing one of the traditional
industries of the prefecture.

5th tour Ex5-180112-English.pdf  Ex5-180112-Japanese.pdf