Modeling of the impact factors on the length development of the marl gullies and determined of the sediment contribution of them (case study: Darb Khazine Basin)
Author(s):
Abstract:
The Gully erosion is one of the accelerated forms of soil degradation in ranges and agricultural lands, which are warning signs of serious for land degradation and progressive erosion. Monitoring of effective factors of the gully length development over time is a necessity to sustainable development in watersheds. In this research the advancement of 30 headcuts were assessed through digital interpretation of multi-temporal aerial photos, photometric methods, field observations and GIS data analysis over the two periods of 1964-1993 and 1993-2013, and contributing sediment suspended and bed load by using of sediment balance model which carried out on Darb Khazine basin. Moreover, the stepwise regression analysis procedure was applied to extract the effective factors on gully head advancement (such as topography, physio-chemical soil attributes and morphology of gully). The results indicated that the mean of gully head advancement over the periods of 1964-1993, 1993-2013 were measured 0.37, 0.65 respectively, which averagely 77percent have increased. Further, regression analysis revealed by 9 main factors and R 95%, As the model indicated among main factors, the Na, EC and organic matter factors with R2 , 0.83 and R , 0.91 are the most effect factors on gully head advancement. The gully sediment balance showed that two-thirds and one-third of sediment discharge are formally suspended load and bed load, respectively. This topic is useful as suitable criteria to distinguish the active gullies in order to prioritizing the conservation activities.
Language:
Persian
Published:
Journal of Range and Watershed Management, Volume:70 Issue: 2, 2017
Pages:
531 to 541
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