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Tree ring information and rainfall characteristic for landslide in the Kobe District, Japan
Author(s) -
Kashiwaya Kenji,
And Takashi Okimura,
Kawatani Takeshi
Publication year - 1989
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.3290140106
Subject(s) - landslide , debris , geology , dendrochronology , proxy (statistics) , period (music) , climatology , physical geography , hydrology (agriculture) , geography , geomorphology , geotechnical engineering , mathematics , oceanography , paleontology , statistics , physics , acoustics
Heavy rainfall on the south side of the Rokko Mountains has often caused severe landslides and debris flows. Analysis of the annual summation of rainfall in excess of 100 mm/day shows that the rainfall in this area has dominant periodicities of about 25–30, 10–13, and 5–7 years. The period of about 25–30 years corresponds to that of occurrence of the natural disasters produced by heavy rainfall; years when the maximum rainfall correspond to years when there have been severe landslides and debris flows in the area. Temporal change in this rainfall may provide a first approximation for erosional force. Analyses of tree ring width from these mountains indicate that the sequences have a dominant periodicity of about 25–30 years. Cross‐spectral analyses for rainfall and ring width in this area show high coherency for the periods of about 25–30 years; evidence that variations in the ring width may be used as proxy data for erosional force.