Effects of consecutive storms on splash erosion components for two different rainfall intensities under laboratory conditions

Document Type : Research Article

Authors

1 PhD Graduate, Department of Watershed Management Engineering, Faculty of Natural Resources, Tarbiat Modares University and Member of Watershed Management Society of Iran

2 Professor, Department of Watershed Management Engineering, Faculty of Natural Resources, Tarbiat Modares University

Abstract

Obviously, no erosion occurs unless detachment takes place first, either by raindrop or runoff. The Raindrop-Impact-Induced Erosion (RIIE) occurs when detachment is caused by raindrop energy. For this purpose, a set of laboratorial experiments were scheduled to examine the effects of consecutive storms on RIIE components (i.e. upward splash, downward splash, net splash, total splash and upward splash/downward splash). The experiments were conducted for two different rainfall intensities of 30 and 90 mm h−1 at slope of 5% under rainfall simulation and soil erosion for a soil collected from Kojour rangeland watershed in the Alborz Mountains, northern of Iran. The comparative analysis of the results showed that there was no significant difference between upward with downward splash under rainfall intensity of 30 as well as under rainfall intensity of 90 mm h−1 in consecutive storms (p ≤ 0.05) using One-Way ANOVA in SPSS Statistics 22 software. In addition, the obtained results indicated that RIIE components viz. total and upward and downward splash were significantly different (p ≤ 0.01) under rainfall intensities of 30 and 90 mm h−1 in the third, fourth and fifth consecutive storms. However, net splash and upward/downward splash proportion was not significantly different (p > 0.05) under rainfall intensities of 30 and 90 mm h−1 in different consecutive storms. The results also indicated a 2.5-fold increase in coefficient of variation of net splash and total splash under rainfall intensity of 30 mm h-1 then the rainfall intensity of 90 mm h-1.

Keywords

Main Subjects

References

 
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Iranian journal of Ecohydrology
Volume 4, Issue 3
September 2017
Pages 837-846

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History

  • Receive Date: 28 February 2017
  • Revise Date: 21 April 2017
  • Accept Date: 19 April 2017
  • First Publish Date: 23 September 2017
  • Publish Date: 23 September 2017

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