The Assessment of Tectonic in Basins by Using Geomorphologic Characteristics in the TecDEM Model (Case study: Roudak Basin in the North East of Tehran).

Identification of active tectonic zones، especially in regions of structural converge to the potential risk of considerable importance to them. On the other hand، due to the physical limitations of surveys in these areas with rough topography is difficult and conflicting. In this study، using remote sensing techniques، Geomorphometry and limited fieldwork، morphometric and geomorphologic characteristics Roudak in the North East of Tehran TecDEM model was implemented in Matlab software، the digital data (digital elevation model) and extraction have been analyzed. The results and analysis of structural elements Morphotectonic Publications such as the longitudinal profile of the river، flow directions، basin morphology، the change in slope، equal maps، calculate indicators of tectonic geomorphology and curves of hypsometry and sleekness of the strain and the resulting action tectonic forces have responded reflect changes on the watershed and the young and active Morphotectonic it now. To investigate active tectonics in the study area، using geological maps scale 1:100،000 for، knows، MarzanAbad and Tehran area that it is located in the catchment area، to evaluate the number and types of faults in the area Also in the region، and evidence of active tectonic faulting in the area including the separation of large and small pieces of stone from steep slopes that raise the risk of loss in the study and were observed. Finally using DEM and DTM software Tecdem1. 0 ArcGis10. 0 and overall catchment area Roudak and then sub-basins have been extracted. To study the tectonic activity in the area of software Tecdem، DEM، you must map to bring Depression less، so that a height map of the study area should be free of any surface discontinuities. The map is based on the tectonic influence of topography changes and the resulting change in classification confirms drainage basin. The different algorithms in terms of accessions to run on different software by researchers to analyze the tectonic activities there; one of them recently for the analysis of geomorphic used by Annex TecDEM is. The rider in the first step، attention and effort to develop a single system to run most of the techniques used in the analysis of tectonic TecDEM based software MATLAB، in order to understand the tectonic activity of the Digital Elevation Model DEM uses. The capabilities of this software can be used to create a longitudinal profile of the river، the calculation of flow directions، extracting watershed، determine the slope change، tectonic maps of the equal and index noted. According to the index calculated by the single tail and troughs of the index gradient، the gradient of the river slope، topographic symmetry of the integral cross hypsometry، the active tectonics of the basin has been proven. The sub watershed 4 Garmabdar highest rates of basin and watershed activities Meygoon lowest rates of tectonic activity index based on the concavity and slope index and slope gradient. While the rate of tectonic activity، based on the topography of the transverse symmetry، basins 1 and 3 shows the maximum tilt. There are also all sub-basin hypsometry curves of young people in the catchment basins (4) shows that most of its convexity. Despite the difference in the indices، the mean indicate tectonic regime in the study area and in the area of youth. Tectonic activity، the amorphous network of rivers. Study of the nature of this disorder can be associated with a great understanding of the origin and direction of tectonic activity areas. Because the pattern of drainage network development، including indicators that are very sensitive to changes in tectonic activity (chlorine Bunter، 1996:1). Studies conducted in recent years the role of neotectonic activity in the formation of river systems (destroyed، 15:2003). Dents and powerful gradient analysis of indicators for neotectonic study by analyzing the flow of the river that the tectonically active regions go، is. Match field studies and library studies were carried out on the geological map of 1:100،000 in the studies performed by the software Tecdem and indicators tectonic geomorphology and maps produced by the Demonstrates the proper use and application of these methods in the analysis of tectonic zones is Tecdem especially in relation to areas that may not be possible to study its field.