Effectiveness thresholds of rainfall intensity and slope gradient on erosion process in rainfed lands in Kalaleh region, Golestan Province

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Aliramayee Ramyar; KHALEDI DARVISHAN ABDULVAHED; ARABKHEDRI MAHMOOD

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Journal: IRANIAN JOURNAL OF ECOHYDROLOGY Year:2016 | Volume:3 | Issue:3 Page(s): 293-301

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Title

Effectiveness thresholds of rainfall intensity and slope gradient on erosion process in rainfed lands in Kalaleh region, Golestan Province

Author(s)

Aliramayee Ramyar | KHALEDI DARVISHAN ABDULVAHED | ARABKHEDRI MAHMOOD | Issue Writer Certificate

Keywords

field capacityQ2

rainfall simulatorQ2

rainfed landQ2

sedimentQ2

soil lossQ2

Abstract

The purpose of the present study was to evaluate the response thresholds of the main steps of erosion and sediment transport at plot scale in rainfed lands in Kalaleh region, Golestan province. The rainfall was simulated using Kamphorst simulator with plot dimensions of 25×25 cm considering rainfall intensities of 33, 64, 80 and 110 mm hr-1 and three slope gradients of 6, 12 and 25% infour replications. sediment concentration and soil loss were calculated by measuring runoff and sediment at the plot outlets and the results were analyzed in rainfall intensity and slope treatments. Based on the results of statistical analysis, the amount of sediment concentration increased with increasing rainfall intensity on all studied slopes. The main effect of rainfall intensity and slope gradient on sediment concentration and soil loss was significant (P􀂕 0. 05), but their interaction effect was not significant. The results of determining subsets using Duncan test showed that sediment concentration had significant change between rainfall intensities of 33 and 64mm hr-1 and the slope gradient of 6 and 12%, while about soil loss, the subsets were 64 and 80 mm hr-1 and the 12 and 25%, respectively. In other words, with consumption of the linear trends, the plot hydrological response threshold of sediment concentration (sediment detachment and entertainment) wasabout 50 mm hr-1 of rainfall intensity and 9% of slope, while in case of soil loss (sediment transport) was at the higher rainfall intensities (about 72 mm hr-1) and higher slope gradients (about 18%).

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APA: Copy

Aliramayee, Ramyar, KHALEDI DARVISHAN, ABDULVAHED, & ARABKHEDRI, MAHMOOD. (2016). Effectiveness thresholds of rainfall intensity and slope gradient on erosion process in rainfed lands in Kalaleh region, Golestan Province. IRANIAN JOURNAL OF ECOHYDROLOGY, 3(3 ), 293-301. SID. https://sid.ir/paper/254286/en

Vancouver: Copy

Aliramayee Ramyar, KHALEDI DARVISHAN ABDULVAHED, ARABKHEDRI MAHMOOD. Effectiveness thresholds of rainfall intensity and slope gradient on erosion process in rainfed lands in Kalaleh region, Golestan Province. IRANIAN JOURNAL OF ECOHYDROLOGY[Internet]. 2016;3(3 ):293-301. Available from: https://sid.ir/paper/254286/en

IEEE: Copy

Ramyar Aliramayee, ABDULVAHED KHALEDI DARVISHAN, and MAHMOOD ARABKHEDRI, “Effectiveness thresholds of rainfall intensity and slope gradient on erosion process in rainfed lands in Kalaleh region, Golestan Province,” IRANIAN JOURNAL OF ECOHYDROLOGY, vol. 3, no. 3 , pp. 293–301, 2016, [Online]. Available: https://sid.ir/paper/254286/en

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