TEMPORAL VARIATION OF RUNOFF PRODUCTION AND RILL EROSION IN A MARL SOIL UNDER DIFFERENT RAINFALL INTENSITIES (SHORT TECHNICAL REPORT)

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VAEZI A.R.; FOROUMADI M.

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Journal: Journal of Water and Soil Conservation Year:2017 | Volume:24 | Issue:1 Page(s): 303-309

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Title

TEMPORAL VARIATION OF RUNOFF PRODUCTION AND RILL EROSION IN A MARL SOIL UNDER DIFFERENT RAINFALL INTENSITIES (SHORT TECHNICAL REPORT)

Author(s)

VAEZI A.R. | FOROUMADI M. | Issue Writer Certificate

Keywords

FLOW DISCHARGEQ1

ERODIBLE PARTICLESQ1

MARL FORMATIONQ1

RILLQ2

FLOW CONCENTRATIONQ1

Abstract

Background and Objectives: RILL erosion is a major factor of soil loss in the MARL FORMATIONs.The MARL FORMATIONs are very susceptible to water erosion processes and cover a wide area in some watersheds in arid and semi-arid regions. Knowledge of temporal variation of RILL erosion and effect of during a rainfall event can provide information on the mechanism of RILL erosion in the hillslopes. The rate of temporal variation of flow characteristics and RILL erosion can be affected by the rainfall intensity. Therefore, this study was conducted to the study of temporal variation of flow characteristics and RILL erosion in a marl soil under different simulated rainfalls.Materials and Methods: A laboratory experiment was carried out using six simulated rainfall intensities ranging from 10 mm h-1 to 60 mm h-1 with three replications. Soil samples were collected from the MARL FORMATIONs in west of Zanjan and separately purred to a flume with 4 m in length and 0.94 m in width putted on 10% slope. RILL erosion and flow characteristics (discharge and concentration) were measured at 5-min from starting flow/ runoff in each rainfall intensity. Rate of RILL erosion and flow characteristics versus rainfall duration was obtained and differences among the different rainfall intensities were computed using the variance analysis method.Results: Results indicated that there are substantial differences in the flow starting time, FLOW CONCENTRATION and RILL erosion among the rainfall intensities (P<0.001). RILL flow and erosion rapidly occurred with increasing rainfall intensity. RILL erosion increased speedily during rainfall and reached to approximately constant value in the last times (about 45 min). The FLOW CONCENTRATION appeared also a similar trend with the RILL erosion, while FLOW DISCHARGE showed an increasing trend in the last times. Most of ERODIBLE PARTICLES were eroded during 45 min from rainfall and after this time, large flows containing lower concentration/sediment were observed in the RILLs.Conclusion: The study revealed that the threshold and pick time of RILL erosion were strongly varied during rainfall. The variation trend of RILL erosion during rainfall increases with increasing the rainfall intensity. RILL erosion temporally varies during rainfall. RILL erosion is strongly dependent on the FLOW DISCHARGE in initial times of rainfall, while in the last times its trend is very different from FLOW DISCHARGE.

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APA: Copy

VAEZI, A.R., & FOROUMADI, M.. (2017). TEMPORAL VARIATION OF RUNOFF PRODUCTION AND RILL EROSION IN A MARL SOIL UNDER DIFFERENT RAINFALL INTENSITIES (SHORT TECHNICAL REPORT). JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 24(1), 303-309. SID. https://sid.ir/paper/156559/en

Vancouver: Copy

VAEZI A.R., FOROUMADI M.. TEMPORAL VARIATION OF RUNOFF PRODUCTION AND RILL EROSION IN A MARL SOIL UNDER DIFFERENT RAINFALL INTENSITIES (SHORT TECHNICAL REPORT). JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2017;24(1):303-309. Available from: https://sid.ir/paper/156559/en

IEEE: Copy

A.R. VAEZI, and M. FOROUMADI, “TEMPORAL VARIATION OF RUNOFF PRODUCTION AND RILL EROSION IN A MARL SOIL UNDER DIFFERENT RAINFALL INTENSITIES (SHORT TECHNICAL REPORT),” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 24, no. 1, pp. 303–309, 2017, [Online]. Available: https://sid.ir/paper/156559/en

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