Outline

 We have conducted various observations in the mountanious watershed including one of the active volcano "Mt. Yakedake", aiming for elucidateing sediment movement processes and mitigating sediment related disasters. The Hodaka Sedimentation Observatory is one of a few research facilities which have carried out continuous monitoring for sediemnt transport in a mountanious watershed.

 Since the observatory was established, we have carried out monitoring of water discharge, sediment transport, and sediment production in the watershed continuously. Recently, we also conduct, monitoring of a distributing rainfall typically observed in mountanious area, observation of sediment production from weathered bedrock on a bare slope, experiment for developing an effective sediment flushing from a dam reservoir, and monitoring of debris flow transport. Furthermore, cooperating with the Kamitakara Observatory, Research Center for Earthquake Prediction, we investigate countermeasure against various hazards resulting in consequence of anticipated erupsion of Mt. Yakedake.

 The Hodaka Sedimentation Observatory aims for a field station that bears overall "mountain researches" for various natural phenomena in the mountanious region.

Year Issues
1965 Sediment control research division was established in Disaster Prevention Research Institute. The observatory was also established.
1967 The observatory belonged to the Disaster Prevention Research Institute
1996 The observatory belonged to the research center for field observation, Disaster Prevention Research Institute
2005 The observatory belonged to the research center for fluvial and coastal disaster, Disaster Prevention Research Institute

Facilities

 The observatory is located 4 km north from the sumit of Mt. Yakedake, which rises on the border between Gifu and Nagano Prefectures. The location is almost center of the Hida Mountains of 3,000 m range, such as Hodaka Mountains and Mt. Kasa.

 Hodaka Sedimentation Observatory is a member of the Field Research Section for Fluvial and Coastal Hazards, together with Shionomisaki Wind Effect Laboratory (Kushimoto, Wakayama), Shirahama Oceanographic Observatory (Shirahama, Wakayama), Ogata Wave Observatory (Jyoetsu, Niigata), on the frontiers of the field observation for natural hazards.

Facilities
Observatory Area: 7,779㎡
Buildings:main building、laboratory building、two depot buildings
Observation watersheds Hiru dani: 0.85 k㎡, Ashi-arai dani: 6.5 k㎡ , The Takahara River: 526 k㎡
Shared facilities Hiru dani check dam, Ashi-arai dani observation flume
main building of the observatory check dam in Hiru dani (4.7m high, 7m wide) experimental flume in Ashi-adai dani(11m long, 5m wide)
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