The Impact of Physiographic Conditions and its relationship with landslide around forest roads (case study: Pahnehkola district, Mazandaran Wood and Paper Industries)

Landslide is one of the disasters that makes some problem while doing forestry projects. Therefore after identifying some areas that are sensitive to Landslide, it is necessary to choose some suitable alternatives. In recent years, Landslide has increased in Northern regions because of changing land use from forest into farms and building roads. This study did around built forest roads in Pahnehkola district that is in 17 km of sari. First we provided topographic map of region and did general studies over there, then review the studied region and identified 30 Landslide areas at both side of built forest roads from 100 m radius up to 200 m radius. Then measured Landslide areas including width, length and height and also the distance of Landslide areas from roads by using meter, then calculated Landslide area and volume. In this study, we determined Landslide situation and provided scattering map by using GPS set and recorded Landslide areas and digit Landslide scattering map by using Arc-view software and gave into (GIS) Geographic Information System. Also Landslide side and slope determined by using compass and inclinometer. Then we inputted some data in SPSS software. Results show that in two slope classes (20-10 and 30-20 per cent), there is no significant difference in the landslide area and volume. In two height classes, the area and volume of slip have significant difference at 1%. Therefore we should plan to spend expenses and essential accuracy in structuring operation and other technological structures in some sensitive area to Landslide.

Keywords:

Landslide , forest road , physiographic , Pahnekola Distric (Mazandaran)