Dependency of runoff characteristics on the plot scale in rainfed land under semi-arid rainfalls

Subject Areas : Farm water management with the aim of improving irrigation management indicators

علی رضا واعظی ¹ , مژگان نوقان ² , مجید فرومدی ³

1 - گروه علوم خاک-دانشکده کشاورزی-دانشگاه زنجان
2 - کارشناسی ارشد خاکشناسی از دانشگاه زنجان
3 - دانشجوی دکتری خاکشناسی دانشگاه زنجان

Received: 2017-02-05 Accepted : 2017-06-21 Published : 2017-10-23

Keywords: total runoff volume, runoff coefficient, erosion plot, runoff per area,

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 particularlyin rainfed lands. This study was carried out to investigate the effect of slope length on runoff in rainfed lands ofsemi-arid regions, north west of Iran. Twenty two plots with different lengths ranging from 1 to 22.1 m and withthe same width were installed on a 10% slope according to the Universal Soil Loss Equation model. Runoffcharacteristics (total runoff volume, runoff per area and runoff coefficient) were determined for a fourteen-monthperiod from March 2015 to Jun 2016. The results indicated that significant difference was found among the plotsin total runoff volume (P< 0.0001). Total runoff volume was significantly differed from 1-m plot to 8-m plotwhile 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. Runoffcoefficient was largely differed in the rainfall event. There was no significant relationship between runoffcoefficient and rainfall intensity. Runoff per area increased from plot 1-m to plot 8-m and decreased gradually inthe larger plots. According to this result, plot 8-m can be considered as a proper plot for investigating runoff inthe rainfed lands.

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