Geomorphometric characterization analysis of mega basin in Binalood and Kopet Dagh Mountain Ranges using geomorphological techniques and GIS and Remote Sensing

Geomorphometry is branch of geomorphology that studies quantitatively the form of the landsurface. basis of geomorphometric calculations in research is ۳۰ meters digital elevation model(DEM) River basin delineation, mapping of slope, aspect, flow direction, and drainage routeshas been accomplished using Hydrology tool, extension of ArcGIS ۱۰.۳ Software. Strahler's andHorton’s method of stream ordering has been utilized for all stream related calculations. In thisstudy calculated morphometric parameters of such as : area (A), the perimeter (P), the ratio of acircle (Re), elongation ratio (Rf), mean height (H), mean slope (S), drainage density (Dd), drainagefrequency (Df) along the channels (BL), fault density (DF), the percentage of Quaternary formations(PQ), bifurcation ratio (Rb), the number of hierarchical anomaly (Ha), hierarchical anomaly index(Δ a), density hierarchical anomaly (ga) in the ۱۷ Basin in the North east of Iran. According to thecalculations, Kardeh and Ardak basins have the most waterways with ۵۷۲۷ and ۶۳۹۸ respectively, and Dizbadand Darrood basins have the least waterways with ۳۷۸ and ۶۰۲ respectively. The lowest amount of branchingratio is calculated for Frizi Basin with ۲.۸ and the highest amount is ۵.۷۲ for Golmakan Basin. The higher thebranching ratio, the more the shape of the basin is from round to elongate. As it can be seen from thecalculation of the Nast Ash'abat index, Golmkan and Shandiz basins have a more elongated shape than otherbasins, on the other hand, Farizi and Radkan basins have a rounder shape than other basins, and as a result, theirflood hydrograph has a sharper peak. , Kardeh and Ardak basins are the highest with ۷۹۸۹ and ۸۳۸۰respectively, and Dizbad and Golmakan basins with ۲۶۷ and ۷۲۳ have the lowest amount of ha. Taghan andFarizi basins have the highest Δa with ۲.۲۶ and ۱.۸۵, respectively, and Chekneh and Shandiz basins have thelowest Δa with ۰.۹۱۰ and ۰.۹۱۸. Also, Taghan and Frizi basins have the highest and Dizbad and Shandis basinshave the lowest density of drainage anomaly (ga). These studies are useful in watershed studies, sedimentestimation, natural disaster management and environmental management.

Keywords:

Mega Basin , Geomorphometry , GIS , Parameters , Remote Sensing