A Study on the Effective Factors on Sediment Production by Gully Erosion in Different Climates of Fars Province
2007
Soleimanpour, Masoud
Fars province has experienced gully erosion in six climate zones based on Demarton's classification method. After selecting one region from each climate zone, 15 active and representative gullies were determined using morphometric characteristics and watershed area, slope gradient above gully heads, linear advancement, form factor, particle size analysis, vegetation cover, gravel content and bare ground were measured and sediment production was calculated. Effective factor on sediment production due to gully erosion were determined using Stepwise method in the SPSS software. The results of this research revealed that four factors including slope gradient, maximum 24 hours rainfall, sand and form factor had significant impact on sediment production in the one percent level. Slope gradient above the gully head was the most important factor on the sediment production. Slope gradient and form factor had positive relationship and maximum 24 hours rainfall and sand had negative relationship with gully development. The most important impact of slope gradient on the sediment production implying the velocity of surface runoff concentrated above gully heads. Alternative controls to decrease slope gradient would be effective on the reduction of gully development and sediment production.
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