ارتباط ساختمان چين خورده بخش شمال شرقي البرز و تكامل الگوي زهكشي ورادار ETM و TM با استفاده از تصاوير ماهواره اي

The Relationship Between Structural Folding in North East Elborz and the Evolution of Drainage Pattern

Geological and stratigraphical structures affect the balance of network drainages. Indeed, between all factors which determine the characteristics of drainage network, lithology and tectonic are very important. These factors control the part of drainage network from the erosion point of view. In finding their way, rivers always choose the weak points of the formations. In addition, faults, fissures and cracks in stones are the best places for overlapping and evolution of drainages. Due to extensive expansion of rivers and the plentiful ness of small anticlines in the north-east of Elborz, the way of drainages evolution and the effectiveness of anticline geomorphology of this area in the drainage pattern have been investigated. Geomatica software was used as the main tool of the study. order to analyze the effective variables. More over, Thematic Mapper (TM) and Enhanced thematic Mapper plus (ETM) satellite images and also radar images were used as a tool for indirect observation and numeric data analyses. Comparing the results of quantitative data analyses with geological maps show that in the north east of Elborz, the rivers have crossed the anticlinals and created the cluses. The results also show that the major part of these geomorphological landforms have been almost smoothed during the time and under the effect of extensive erosion dominating north and north east of Elborz. Although, these created cluses are not visible in satellite images, and quantitative comparison with geological maps and field data, using structural reconstruction technique. Reveals the existence of such old cluses and shows the performance of transversal networks in this system.