The Effect of Temporal Distribution Pattern of Rainfall Intensity on Runoff and Soil Loss in a Hillslope in a Semi-Arid Region
The temporal distribution pattern of rainfall can play a role in the production of runoff and soil loss during rainfall. This study investigated four rainfall patterns: uniform, advanced, intermediate, and delayed rainfall under field conditions. The rainfall height in all rainfall patterns was 20 m...
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Isfahan University of Technology
2025-01-01
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| Series: | علوم آب و خاک |
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| Online Access: | http://jstnar.iut.ac.ir/article-1-4422-en.pdf |
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| author | A.R. Vaezi F. Besharat F. Azarifam |
| author_facet | A.R. Vaezi F. Besharat F. Azarifam |
| author_sort | A.R. Vaezi |
| collection | DOAJ |
| description | The temporal distribution pattern of rainfall can play a role in the production of runoff and soil loss during rainfall. This study investigated four rainfall patterns: uniform, advanced, intermediate, and delayed rainfall under field conditions. The rainfall height in all rainfall patterns was 20 mm. In the uniform rainfall pattern, a constant rainfall intensity (40 mm h-1) was used and in the non-uniform rainfall patterns, a maximum rainfall intensity of 40 mm h-1 was applied for a 15-minute duration. The experiments were carried out in 60 cm × 80 cm plots on a hillslope with a slope gradient of 9% at three replications. Rainfall patterns were set up on the plots in five events with an interval of one week. The results showed a significant difference between rainfall patterns in runoff and soil loss (p<0.01). This difference was due to the destruction of surface soil structure and the reduction of water infiltration rate, especially during peak time of rainfall intensity (40 mm h-1). The highest runoff occurred in the delayed rainfall (3.43 mm) while, the highest soil loss (61.47 g m-2) was observed in the intermediate rainfall, which was associated with the peak intensity of rainfall at the end of the rainfall and its role in the destruction of the soil structure on the one hand, and the loss of infiltration rate on the other hand. Variation of runoff and soil loss from one event to another indicated that soil loss is in line with runoff production in uniform rainfall, while soil loss did not follow runoff in other rainfalls. Soil loss in these rainfalls was affected by both runoff production and availability of erodible soil particles. These results revealed the necessity of studying the rainfall intensity distribution pattern for accurate prediction of soil erosion and determining soil loss variation event by event in the semi-arid region. |
| format | Article |
| id | doaj-art-7957fe6601da4be8a53a0d791ebe063f |
| institution | DOAJ |
| issn | 2476-3594 2476-5554 |
| language | fas |
| publishDate | 2025-01-01 |
| publisher | Isfahan University of Technology |
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| series | علوم آب و خاک |
| spelling | doaj-art-7957fe6601da4be8a53a0d791ebe063f2025-08-20T03:00:35ZfasIsfahan University of Technologyعلوم آب و خاک2476-35942476-55542025-01-012842334The Effect of Temporal Distribution Pattern of Rainfall Intensity on Runoff and Soil Loss in a Hillslope in a Semi-Arid RegionA.R. Vaezi0F. Besharat1F. Azarifam2 Department of Soil Science and Engineering, Faculty of Agriculture, University of Zanjan, Zanjan, Iran. Department of Soil Science and Engineering, Faculty of Agriculture, University of Zanjan, Zanjan, Iran. Department of Soil Science and Engineering, Faculty of Agriculture, University of Zanjan, Zanjan, Iran. The temporal distribution pattern of rainfall can play a role in the production of runoff and soil loss during rainfall. This study investigated four rainfall patterns: uniform, advanced, intermediate, and delayed rainfall under field conditions. The rainfall height in all rainfall patterns was 20 mm. In the uniform rainfall pattern, a constant rainfall intensity (40 mm h-1) was used and in the non-uniform rainfall patterns, a maximum rainfall intensity of 40 mm h-1 was applied for a 15-minute duration. The experiments were carried out in 60 cm × 80 cm plots on a hillslope with a slope gradient of 9% at three replications. Rainfall patterns were set up on the plots in five events with an interval of one week. The results showed a significant difference between rainfall patterns in runoff and soil loss (p<0.01). This difference was due to the destruction of surface soil structure and the reduction of water infiltration rate, especially during peak time of rainfall intensity (40 mm h-1). The highest runoff occurred in the delayed rainfall (3.43 mm) while, the highest soil loss (61.47 g m-2) was observed in the intermediate rainfall, which was associated with the peak intensity of rainfall at the end of the rainfall and its role in the destruction of the soil structure on the one hand, and the loss of infiltration rate on the other hand. Variation of runoff and soil loss from one event to another indicated that soil loss is in line with runoff production in uniform rainfall, while soil loss did not follow runoff in other rainfalls. Soil loss in these rainfalls was affected by both runoff production and availability of erodible soil particles. These results revealed the necessity of studying the rainfall intensity distribution pattern for accurate prediction of soil erosion and determining soil loss variation event by event in the semi-arid region.http://jstnar.iut.ac.ir/article-1-4422-en.pdfrainfall patternsimulated rainfallrunofferosion plotsoil loss |
| spellingShingle | A.R. Vaezi F. Besharat F. Azarifam The Effect of Temporal Distribution Pattern of Rainfall Intensity on Runoff and Soil Loss in a Hillslope in a Semi-Arid Region علوم آب و خاک rainfall pattern simulated rainfall runoff erosion plot soil loss |
| title | The Effect of Temporal Distribution Pattern of Rainfall Intensity on Runoff and Soil Loss in a Hillslope in a Semi-Arid Region |
| title_full | The Effect of Temporal Distribution Pattern of Rainfall Intensity on Runoff and Soil Loss in a Hillslope in a Semi-Arid Region |
| title_fullStr | The Effect of Temporal Distribution Pattern of Rainfall Intensity on Runoff and Soil Loss in a Hillslope in a Semi-Arid Region |
| title_full_unstemmed | The Effect of Temporal Distribution Pattern of Rainfall Intensity on Runoff and Soil Loss in a Hillslope in a Semi-Arid Region |
| title_short | The Effect of Temporal Distribution Pattern of Rainfall Intensity on Runoff and Soil Loss in a Hillslope in a Semi-Arid Region |
| title_sort | effect of temporal distribution pattern of rainfall intensity on runoff and soil loss in a hillslope in a semi arid region |
| topic | rainfall pattern simulated rainfall runoff erosion plot soil loss |
| url | http://jstnar.iut.ac.ir/article-1-4422-en.pdf |
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