Study on sedimentation in flood spreading networks of Poldasht aquifer, West Azarbaijan

Flash floods may cause huge damages. Flood spreading on aquifers is a well-known approach in Iran to control its damages. But the turbidity of floodwater can reduce the efficiency of these systems via closing the soil water pores. Since the results of flood spreading projects differ in different regions، it is necessary to produce a suitable method in order to increasing efficiency of such designs. This research has been done with the aim of study and determining the effect of flood spreading on the soil sedimentation in Poldasht flood spreading station located in West Azarbaijan. Soil sedimentation differences were evaluated via comparison controls during 5 years at many spreading channels of three lines by Graded scales measured the sediment depth of the surface ground. The data obtained were analyzed by t-student method if their statistical distributions were normal otherwise non-parametric methods were used. The results showed sediment depth data have not normal distribution. The Kruskal-Walis test showed sediment depth of first line differs significantly with the second and third line sediment depth whereas these parameter dos not differ between second and third lines. Sediment depth of year 1 is differs by year 2 significantly. The difference of the data of year 3 with the data of years 4 and 5 are significant. Also the data of 4th year are significantly differs with 5th year. Also Kriging method has the highest with correlation coefficient %98 for year 1 and 0. 71 for year 5 with Gaussian semi-variorum، has high accordance to estimate the non-sampled points.