منصور بخشی

The preparation of geomorphological maps is requiring a lot of time and extensive money to collect information on maternal and landforms. Registration maternal features in these maps are usually based on geological maps, field operations, and aerial photographs analyzing. However, due to the resistance of rocks and sediments against erosion is different, it is possible to identify and distinguish them by 1:25000 topographic maps and by studying the form of contours. The purpose of this study is to identify contour forms of topographic maps and find their relationship with geological formations of the region in Part of northern and southern Alborz. For this purpose, the existing contours forms including straight contours, and simple sinusoidal, long and elongated sinusoidal, dense sinusoidal and pulsed curves are classified in topography maps of the region and overlapped with the formation maps of the region that supply by using geological maps 1:100000 geological surveys of Iran. Chi-square tests were used to analyze the relationship between them. The results showed that the contour forms of the geological formations of the area were significantly different at the 0.01 level. The contour forms of straight and simple predominate in hard rocks and dense sinusoidal forms in loose formations and are higher than expected. Therefore, the rock material is effective in creating specific contour forms of topographic maps of the area and since these forms are easily recognizable in these maps, it is therefore possible to use topographic maps to obtain material information for geomorphological maps.