Unevenness and its occurrence factors on skid trails with different years of abandonment

Masuda Harumi, Shinohara Yoshinori, Kubota Tetsuya

doi:10.15017/1508418

Recently, forest managers have recognized the importance of road networks for forest practices, and constructed new skid trails aggressively. However, few studies investigated the soil erosion rate and its occurrence factors on skid trails. This study examined unevenness of the surface of skid trails at 101 cross sections on seven routes in Fukuoka prefecture, Japan. We measured roughness at 8-25 cross sections for each route, and calculated the average and maximum depths of roughness (d_<ave> and d_<max>, respectively) for each cross section. The averaged d_<ave> over all cross sections on a route (D_<ave>) was different among routes. On the routes with the relatively long abandoned period, d_<ave> with the long abandoned period tended to be larger than D_<ave> with the short abandoned period. This result suggests that the total precipitation strongly affect D_<ave>. On the routes with the relatively long abandoned period, there was a positive relationship between d_<ave> and the slope angle of each cross section. We found approximately the same relationship between the annual average d_<ave> (d_<ave>/the abandoned period) and the slope angle for these routes. This result suggests d_<ave> for each cross section could be determined by slope angle only, and not be strongly affected by differences of routes. Further studies are required to verify the above findings under various geological, topographical, and climate conditions.

Unevenness and its occurrence factors on skid trails with different years of abandonment

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