Tectonic and Erosion analysis of Shahid Abbasspour Dam catchment using geomorphometric techniques

A thorough assessment of tectonic activity, especially active tectonic movements and the resulting hazards, requires a thorough understanding of geomorphological processes. Many geomorphological features are very sensitive to active tectonic movements and change with them. The aim of this study was to use geomorphic indices (basin asymmetry index (Af), basin sinuosity index (S), basin shape index (BS), river longitudinal slope index (SL), branching ratio (Rb), unevenness number (Rn Relative basin protrusion (Bh), mountain frontal maze (Smf), drainage density (Dd), hypsometry), drawing and analysis of erosion maps of formations, soils and land use to know the relationship between tectonic activity With soil erosion, Karun catchment area (upstream of Shahid Abbaspour Dam). The results show that tectonic activity in erodible formations causes lateral erosion and as a result the soils are eroded, but in resistant formations the tectonic activity has little effect and the soils have almost their own strength. . Sub-canals also often enter the main stream at an acute angle. Karun River in the study basin is spread on soft and erodible formations such as Gurpi, Pabdeh, Aghajari, Gachsaran and Mishan and flows with less intensity. In this case, the erosion along the river is less, but the erosion is dominant. The most erosion is along the river in the center and southeast parts of the basin. The basin is hypsometrically balanced and the topographic and geomorphic appearance of the studied basin is affected by tectonic activities of zagros mountain range, which results in high elevation and tilt of the basin.