Factors and influences of driftwood disaster caused by the north Kyushu torrential rain in 2017: Toward consensus-building for forest environmental policy

KAKEN

About this project

Japan Grant Number
JP18H04152
Funding Program
Grants-in-Aid for Scientific Research
Funding organization
Japan Society for the Promotion of Science
Project/Area Number
18H04152
Research Category
Grant-in-Aid for Scientific Research (A)
Allocation Type
  • Single-year Grants
Review Section / Research Field
  • Medium-sized Section 64:Environmental conservation measure and related fields
Research Institution
  • Kyushu University
Project Period (FY)
2018-04-01 〜 2022-03-31
Project Status
Completed
Budget Amount*help
38,870,000 Yen (Direct Cost: 29,900,000 Yen Indirect Cost: 8,970,000 Yen)

Research Abstract

This study analyzed the causes and effects of landslides and driftwood disasters using the torrential rainstorm in Northern Kyushu, Japan, in July 2017, as a case study and examined forest zoning methods and social recovery issues. A high proportion of hillslopes collapsed, starting with forests of less than 20 years of age. The flow of driftwood increased due to driftwood conversion (mainly in cedar plantations, which are common in the area) and the lack of suitable intercepted terrain in the mountain streams. Changes in vegetation and the stream environment in the affected areas were monitored at fixed points for five years after the disaster; although the degree of recovery depended on the geology, it would take many more years for the area to fully recover. Socially, it was showed that the disasters triggered the depopulation of settlements and that the rehabilitation and creation of landscapes and culture is important in the disaster reconstruction process.

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