Evaluating the effect of tectonic on morphology of alluvial fans around Danekhoshk Anticline

There are many alluvial fans with different morphology formed around uplifting Danekhoshk anticline south of the city of Sarpole Zahab in Kermanshah Province in the Zagros Folded Belt. The purpose of this research is to evaluate the morphometric characteristics of alluvial fans such as area (FA)، topographic slope (SF)، length of fan base (BF)، width/length ratio (W/L)، fan radius (R)، and sweep angle (SA)، and their relationships with structural dip of anticline limb (DAL)، basin area (AB) and basin topographic slope (BS). Danekhoshk anticline was subdivided into 8 tectonic zones based on dip of strata on limbs. Then، mean of mentioned parameters were calculated in each zone. Result of this study reveals that rate of SA، R، W/L، BF، SF and FA increases as dip of anticline limb increases. Nonetheless، correlation coefcient between dip of strata on limbs and SA as well as BF is higher than other parameters. There is positive relation between topographic slope of basins (SB) and all parameters of SA، R، W/L، BF، SF and FA with low correlation coefcient (less than 60%). Data analysis represents that basin area (BA) doesn’t have considerable effect on SA، R، W/L، BF and FA parameters. There is a negative relation between basin area and slope of fan (SF) with a correlation coefcient of 78%. Overall، this research shows morphology of alluvial fans specially sweep angle and length of fan base are entirely affected by tectonic setting of Danekhosh Anticline.