Scientific Quarterly Journal of Iranian Association of Engineering Geology

Scientific Quarterly Journal of Iranian Association of Engineering Geology

The effect of hydrodynamic and morphologic conditions of Bahmanshir river on engineering geological properties of tidal deposits of Bahmanshir series

Document Type : Original Article

Authors
Ghanbar Malek 1
Mashaallah Khamehchian 2
Kazem Moradi Harsini 3
1 Department of Engineering geology, Tarbiat Modares University, Tehran, Iran.
2 Department of Engineering geology, Tarbiat Modares University, Tehran, Iran,
3 Faculty of Science of Geology, Damghan University, Damghan, Iran
Abstract
 
Bahmanshir river is a two directional tidal river in southwest Khuzestan province (IRAN). This river originates from Karun river near Khoramshahr city (upstream) and traverses downstream about 80 km before falling into the Persian Gulf. Holocene deposits along Bahmanshir river commonly consist of two clayey layers that have been separated by silty sand beds. These complexes have been known as Bhamanshir series which have deposited in tidal environment. Hydrodynamic and sedimentary environments studies of  Bahmanshir river show that tidal currents flow upstream from Arvand River and downstream from Persian Gulf also in the middle part of river due to its meandered morphology, the intensity and energy of tidal currents reduces. The main aim of this research is, to investigate the effect of hydrodynamic and morphologic conditions of Bahmanshir river on engineering geological properties of tidal deposits of Bahmanshir series. The results of studies reveal that engineering geological properties of deposits are approximately the same for both upstream and downstream of the river but in the middle part due to its meandered  morphology and reduction in energy intensity of flow, percentage of clayey minerals are more than upstream and downstream. This difference in percent of clayey minerals has caused the variety of engineering geological properties middle part rather than other region.
Keywords
Engineering geological properties
Bahmanshir river
Deposits of bahmanshir tidal series
Hydrodynamic and morphology
Subjects
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Scientific Quarterly Journal of Iranian Association of Engineering Geology
Volume 4, Number 1 & 2
September 2011
Pages 1-14

  • Receive Date 25 December 2010
  • Revise Date 20 March 2011
  • Accept Date 23 November 2011