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Evaluation of downstream trends in sediment morphometric characteristics affected by hydrologic and lithologic controls in Vartavan catchment
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Jamal Mosaffaie *   , Mohammad Reza Ekhtesasi , Mohammad Taghi Dastorani |
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Abstract: (8669 Views) |
| Downstream trends in sediment size variation provide valuable information for related catchment sciences. Downstream sediment fining is one of basic beliefs in the river systems and numerous studies have also been conducted in this regard during recent decades. The main goal of this study was to determine and analyze downstream trend of sediment size in the streams of Vartavan catchment (4811 ha) in Qazvin province. For this purpose, 25 sediment samples from streams with rank 1 to 6 and 30 soil samples of various lithology units were collected. Various morphometric indices were determined after grain size analyses. The results showed according to hydraulic sorting rules and based on decreasing slope and increasing main channel length and drainage area, the particle size of channel-bed material must be fine downstream. But particle size of channel-bed material increases downstream, and downstream trend was affected by floods of semi-arid climate and heterogeneous lithology of catchment. Therefore downstream trends of sediment particle size is predominantly controlled by catchment climate and lithology, and hydraulic variations impose secondary role to the overall trend. Results of this study are expected to improve our understanding of downstream trends in the composition of alluvial deposits of semi-arid and geologically heterogeneous catchments. |
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| Keywords: Hydraulic sorting, downstream fining, Semi-arid climate, Heterogeneous lithology |
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Full-Text [PDF 1287 kb]
(2670 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2015/09/27 | Accepted: 2015/09/27 | Published: 2015/09/27
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