Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Study Runoff and Soil Lose in Map Units of Hiv Watershed, Measurements and Comparision at the Rainfall Simulator Scale

Document Type : Original Research Paper

Authors
M. R. Sheykh Rabiee 1
S. Feiznia 2
H. R Peyrowan 3
1 Watershed Management Engineering, Faculty of Agriculture & Natural Resources, Sciencce and Research Branch Islamic Azad University, Tehran, Iran
2 Faculty of Natural Resources, University of Tehran, Karaj, Iran
3 Soil Conservation and Watershed Management Research Institute, Tehran, Iran.
10.22071/gsj.2011.55136
Abstract
Soil erosion is one of the improper natural phenomenons. Soil erosion affects on soil degradation. To study and estimate sediment yield, there are several methods. Rainfall simulator is one of them. At this research, in first step, the work units map is prepared by overlying lithology, erosion and dip maps with together. At each work unit, 51 soil samples obtained in 17 stations. Volume of runoff and weight of sediment of each rainfall simulator test measured. The rainfall simulator was two kinds; one has rain surface 84 cm × 120 cm and the other one 25 cm × 25 cm. Every two kinds are adjustable in various dip degrees. The results in Hiv watershed showed that the highest producted runoff occurred in limestone and dolomite lithology with surface and rill erosion types at general dip more than 40 % and highest amount sediment yield is happened in sandstone lithology with surface and rill erosion types at general dip more than 40 %. With attention to the results and generalization of them to soil lose amount of Hiv watershed, for one rainfall event with 19 mm/h  intensity at 30 minutes duration, the total soil lose of the watershed, 1057.74  ton is estimated
Keywords
runoff
soil lose
Erosion
Work Unit Map
Hiv Watershed
Rainfall Simulator
References
Jordan, A. & Martinez, Z., 2008- Soil Loss and runoff rates on unpaved forest roads in southern Spain after simulated rainfall. Forest Ecology and Management vol. 255 no. 3 Contents pp: 913- 919.
Tiessen, K. H. D., Lobb, D. A.,  Mehuys, G. R. &  Rees, H. W., 2007- Tillage erosion within potato production in Atlantic Canada: ॥. Erosivity of primary and secondary tillage operations. Journal of Soil and Tillage Research 95: 320- 331.
Scientific Quarterly Journal of Geosciences
Volume 20, Issue 80
Winter 2011
Pages 57-62