Seyed Hamidreza Sadeghi; Zahra Hashemi Ariyan; Mehdi Vafakhah; Zeinab Karimi
Abstract
Studying temporal and spatial variations of soil erosion and the effective factors is very important for providing appropriate solutions to properly plan the utilization of watershed resources. However, few studies have attempted to examine temporal and spatial variations of soil erosion. In this study, ...
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Studying temporal and spatial variations of soil erosion and the effective factors is very important for providing appropriate solutions to properly plan the utilization of watershed resources. However, few studies have attempted to examine temporal and spatial variations of soil erosion. In this study, the temporal variability of spatial participation of soil erosion has therefore been investigated in the Gonbad representative and treated watersheds in Hamedan Province with an area of 300 ha. For this purpose, the work units were designated through overlaying land cover type, soil texture, and slope maps. The soil erosion was then measured in each work unit using rainfall simulator with intensity of 50 mmh-1 during 30 minute in two main rainy months of November and October 2014. Then, three points with relatively similar characteristics and representing each work unit were determined in the specific outlines of the equilateral triangle. The soil erosion was consequently measured with five minutes interval after the beginning and ending of rainfall simulation. The results of analysis of variance verified a significant difference (P<0.01) among different work units in soil erosion in both representative and control watersheds verifying spatial variation of different parts of the watersheds in soil erosion and consequent sediment yield. While, no significant difference was found using t-test between soil erosion during November and October 2014.
A Kavian; ALI Azmodeh; K Soleimani; GH Vahabzadeh
Volume 63, Issue 1 , June 2010, , Pages 89-114
Abstract
Globally, soil erosion is one of the most important environmental problems which is threaten soil and water resources. Soil properties are main parameters to affect runoff and soil erosion processes. So, this study was conducted to investigate the effects of some soil properties on runoff and soil erosion ...
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Globally, soil erosion is one of the most important environmental problems which is threaten soil and water resources. Soil properties are main parameters to affect runoff and soil erosion processes. So, this study was conducted to investigate the effects of some soil properties on runoff and soil erosion in the forest lands located in vicinity of Sari city. Rainfall simulator was set in 15 random points in 2 sites to create experimental rainfall. Runoff and sediment yield resulted from each experiment was measured based on field and laboratory investigations. Soil samples from 0-20 cm depth close to the simulation points were collected and analyzed. The results showed that soil initial moisture, percentage of soil organic matter (% SOM), bulk density and sand percent are most effective factors in runoff generation, respectively. Also, the results illustrated that percentage of soil organic matter, soil initial moisture and silt percent affect on soil erosion, respectively. The results of multiple linear models showed that runoff and soil erosion can be predicted based on percentage of soil organic matter, soil initial moisture and percentage of clay with coefficient of determination of 0.638 and 0.752, respectively.
