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Research Journal of Environmental Sciences
  Year: 2009 | Volume: 3 | Issue: 3 | Page No.: 299-310
DOI: 10.3923/rjes.2009.299.310
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Past Runoff Trend for Declivitous Farms of Iran

M. Gholipoor

The regionally determination of direction of runoff changes is a challenging task. This simulation study was aimed to evaluate the past changes in runoff for sloped farms of five locations in Iran (Isfahan, Shiraz, Kermanshah, Tabriz and Mashhad) in 2006-2007. The soil water balance sub-model of CYRUS model with some modifications was used to calculate the value of runoff over monthly and yearly periods and over growing period of chickpea. The model was run for the daily weather data set from 1961 (or 1966) to 2004. Linear regression analyses were used to determine the trends (slopes) in value of runoff. The results indicated that in Isfahan, the value of runoff has increased for January, March and yearly period; on the other hand, it has had a downwardly change for April; runoff has shown statistically steady state for the rest months of the year. It appeared to have upwardly trend just for December in Shiraz. In Kermanshah, it was found the increasing trend in runoff for December, but decreasing trend for February and May. The months February and November have experienced the increasing risk of runoff in Tabriz and Mashhad, respectively. Over growing period of chickpea, this risk has been diminishing for Isfahan and Kermanshah; while it found to be constant for other locations. There is a consensus for inversed relation between recommendable slopes of land for planting the crops, including chickpea and risk of runoff; hence, it can be said that the recommendable slopes for planting the chickpea (Cicer arietinum) in declivitous farms of Isfahan and Kermanshah is steeper in 2000s as compared to those in 1960s.
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How to cite this article:

M. Gholipoor , 2009. Past Runoff Trend for Declivitous Farms of Iran. Research Journal of Environmental Sciences, 3: 299-310.

DOI: 10.3923/rjes.2009.299.310






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