TITLE:
Hypsometric Properties of South Zagros Fold-Thrust Belt Basins: A Case Study in Namdan Basin in SW Iran
AUTHORS:
Asma Nikoonejad, Mohsen Pourkermani, Abdoolmajid Asadi, Mahmud Almasian
KEYWORDS:
Active Tectonics, Eqlid, Hypsometric Integral, Index, Iran Namdan
JOURNAL NAME:
Open Journal of Geology,
Vol.5 No.10,
October
29,
2015
ABSTRACT: Study area is located in
Southwest Iran with relatively flat topography. Outcropped lithological units
in the region belong from Triassic and Jurassic till recent era. The study area
of the Namdan basin is related to the tectonic zone of the high Zagros region
and the compressional-extensional regime. Geomorphic indices of active
tectonics are useful tools to analyze the influence of activity. One of them is
hypsometric integral which has generally been used to reveal the stages of
geomorphic development. It is estimated by the graphical plot of the measured
contour elevation and encompassed area by using empirical formulae. In
constructing the hypsometric integral curve, a Digital Elevation Model (DEM)
with 30 m spatial resolution has been used. This index is calculated in the
study area. Then, based on index of its values, the hypsometric properties of
drainage basins are analyzed in Namdan basin. Three different approaches were
used for estimation of hypsometric integrals. The hypsometric integral values
(HI) range between 0.18 and 0.31 for all the basins of study basin. In the
study area, one stage of erosion cycle development, namely old stage is
distinguished. Our results indicate that there is anomaly in Hi value which is
located on faulted area. The results indicate the Northwest of Namdan basin and
a small part of its Southeast are more active than other ones.