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Impact of Land Use Changes on Sediment Yield in Mandarijan Watershed
Basin
Sadeghi1, S. H. R. Shojaee2, Gh. and Moradi3, H. R.
Abstract
Soil conservation and sediment yield prevention is necessary for preservation and
rehabilitation of renewable natural resources and integrated development of watersheds. The rate
and type of sediment yield is generally a function of climatic conditions, topography, soil and land
use characteristics out of which the importance of land use because of effective role of human is
more than others. In the present study, the relationship between land use changes and sediment
yield was studied in Manderijan watershed located in upstream of Zayandehrood dam basin
covering an area about 23000 ha. The precipitation and the sediment data belonging to the period of
1979 to 2002 were respectively collected from Chadegan climatological and Manderijan
hygrometry stations. The satellite images of MSS 1979, TM 1990, TM 1998 and ETM 2002 were
also applied to map land use during study period. The relationship between sediment yield and
annual precipitation changes were evaluated using five-years moving average and regression
analysis. The assessment of relationship between land use changes and sediment yield was also
made using regression equations for the periods corresponded on the time of available satellite
images. The results of the study revealed that despite of significant variation in annual precipitation
at the confidence level of 99%, it’s controlling role on sediment yield was found to be low owing to
inconsistency of changes trend and their non synchronous variations. The analysis of regression
equations was also verified the significant relationship in cubic form between irrigated agricultural
land use and sediment yield with high determination coefficient of 0.99 and low estimation error of
12%.
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Keywords: Land use, Mandarijan Watershed, Satellite image, Sediment yield, Zayandehrood Dam
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1. Associate Professor, Former M.Sc. Student and Assistant Professor Respectively, Department of Watershed
Management Engineering, College of Natural Resources and Marine Sciences, Tarbiat Modarres University, Noor
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Answers to Test 3