DEPENDENCY OF RUNOFF CHARACTERISTICS ON THE PLOT SCALE IN RAINFED LAND UNDER SEMI-ARID RAINFALLS

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VAEZI ALIREAZA; NOGHAN MOJGAN; FOROUMADI MAJID

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Journal: JOURNAL OF WATER AND SOIL RESOURCES CONSERVATION Year:2017 | Volume:7 | Issue:1 Page(s): 15-28

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Title

DEPENDENCY OF RUNOFF CHARACTERISTICS ON THE PLOT SCALE IN RAINFED LAND UNDER SEMI-ARID RAINFALLS

Author(s)

VAEZI ALIREAZA | NOGHAN MOJGAN | FOROUMADI MAJID | Issue Writer Certificate

Keywords

RUNOFF PER AREAQ2

TOTAL RUNOFF VOLUMEQ1

RUNOFF COEFFICIENTQ2

EROSION PLOTQ1

Abstract

Runoff is the major soil erosive factor which can be controlled to different factors such as hillslope length. Knowledge of the role of hillslope length in runoff can help in designing soil conservation practices particularly in rainfed lands. This study was carried out to investigate the effect of slope length on runoff in rainfed lands of semi-arid regions, north west of Iran. Twenty two plots with different lengths ranging from 1 to 22.1 m and with the same width were installed on a 10% slope according to the Universal Soil Loss Equation model. Runoff characteristics (total runoff volume, RUNOFF PER AREA and RUNOFF COEFFICIENT) were determined for a fourteen-month period from March 2015 to Jun 2016. The results indicated that significant difference was found among the plots in TOTAL RUNOFF VOLUME (P<0.0001). TOTAL RUNOFF VOLUME was significantly differed from 1-m plot to 8-m plot while in the higher plots (from 9-m to 22.1-m plots) there was no statistically difference among the plots (R2=0.97). In general, a significant relationship was found between total runoff and the plot length. RUNOFF COEFFICIENT was largely differed in the rainfall event. There was no significant relationship between RUNOFF COEFFICIENT and rainfall intensity. RUNOFF PER AREA increased from plot 1-m to plot 8-m and decreased gradually in the larger plots. According to this result, plot 8-m can be considered as a proper plot for investigating runoff in the rainfed lands.

Cites

INVESTIGATING INDICES OF SOIL SURFACE EROSION AND THEIR RELATIONS TO SLOPE CHARACTERISTICS IN SEMI-ARID RANGELANDS

References

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APA: Copy

VAEZI, ALIREAZA, NOGHAN, MOJGAN, & FOROUMADI, MAJID. (2017). DEPENDENCY OF RUNOFF CHARACTERISTICS ON THE PLOT SCALE IN RAINFED LAND UNDER SEMI-ARID RAINFALLS. JOURNAL OF WATER AND SOIL RESOURCES CONSERVATION, 7(1), 15-28. SID. https://sid.ir/paper/232293/en

Vancouver: Copy

VAEZI ALIREAZA, NOGHAN MOJGAN, FOROUMADI MAJID. DEPENDENCY OF RUNOFF CHARACTERISTICS ON THE PLOT SCALE IN RAINFED LAND UNDER SEMI-ARID RAINFALLS. JOURNAL OF WATER AND SOIL RESOURCES CONSERVATION[Internet]. 2017;7(1):15-28. Available from: https://sid.ir/paper/232293/en

IEEE: Copy

ALIREAZA VAEZI, MOJGAN NOGHAN, and MAJID FOROUMADI, “DEPENDENCY OF RUNOFF CHARACTERISTICS ON THE PLOT SCALE IN RAINFED LAND UNDER SEMI-ARID RAINFALLS,” JOURNAL OF WATER AND SOIL RESOURCES CONSERVATION, vol. 7, no. 1, pp. 15–28, 2017, [Online]. Available: https://sid.ir/paper/232293/en

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