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:: Volume 11, Number 37 (7-2017) ::
jwmseir 2017, 11(37): 25-33 Back to browse issues page
The Effects of precipitation and land use changes on sediment yield (Case study: Senobar watershed- Torbat Heydarieh)
Maryam Azarakhshi , abolfazl mosaedi, mehdi bashiri, Rana Ojaghlo Shahabi
Assistant Professor University ofTorbat Heydarieh
Abstract:   (686 Views)
Soil erosion in the watersheds is a function of some factors such as climatology, topography, soil type and land use. Within these factors, the importance of precipitation because its high variation and land use because the role of humans on community development is very clear. In this research, the precipitation, discharge and sediment data in a statistical period from 1967 to 2009 were used. Drought situation was calculated by standard precipitation index with 3 months’ time scale. Land use maps were prepared in three periods based on satellite images, and the changes of land use between these periods were compared. Results showed that the area of rangelands and farms from initial to final section of study period varied from 14% and 21% to 41% and 11% respectively. Significant difference in sedimentation rate is visible between initial and final sections of study period. Percentage of drought occurrence increased to triple from initial to final period. The result of Mann-Kendall test showed a negative trend for watershed discharge at 95% significant confidence level. Therefore, it seems that increasing drought occurrences and therefor decreasing runoff and change of farms to rangeland, caused to the decreasing suspended sediment load in Senobar watershed.

Keywords: satellite images, trend analysis, climatological drought, discharge, rating curve
Full-Text [PDF 949 kb]   (145 Downloads)    
Type of Study: Research | Subject: Special
Received: 2015/11/29 | Accepted: 2016/11/21 | Published: 2017/06/28
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Azarakhshi M, mosaedi A, bashiri M, Ojaghlo Shahabi R. The Effects of precipitation and land use changes on sediment yield (Case study: Senobar watershed- Torbat Heydarieh). jwmseir. 2017; 11 (37) :25-33
URL: http://jwmsei.ir/article-1-563-en.html
Volume 11, Number 37 (7-2017) Back to browse issues page
مجله علوم ومهندسی آبخیزداری ایران Iranian Journal of Watershed Management Science and Engineering
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