The effect of side-channel sediment source on downstream fining trend of Haram- Abad River watershed )western Malayer plain(

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Abstract

Haram- Abad river basin (area = 2965 Km2) is an elongated basin located in south ofHamedan Province and occurs in the Sanandaj- Sirjan structural zone.​​ 1392 km2 of this region is located in the westernMalayer plain. Five lithofaceis were recognized in the river sediments: Gms, Gm,  Sh, Sl and Fm and Fr. The river sediments are very poorly sorted, positively skewed and platykurtic.Four discontinuities were recognized in in the downstream decrease in the gravel percent. They occur as a result of the entrance of  side-channel sediment sources (i.e. alluvial fan, tributaries and colluviums) to the main-river channel. Increase in the gravel percent is less significant (3-8%)  in those tributaries with lower slope and slate and schist lithology than the tributaries with higher slope and granite and limestone lithology (25-32%). This shows the provenance lithology is also important in the downstream fining trend of the studied river.  

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History

  • Receive Date: 12 January 2015
  • Revise Date: 26 September 2014
  • Accept Date: 06 June 2015

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