Evaluation of fractal properties of different layers sedimentation behind the check dam

In this research, fractal relationships were used to evaluate the particle size distribution of the check dam. Three check dams with height of 2, 2 and 2.6 meters were selected and the hole was drilled same the height of the check dam at the sediment deposits. Then, depending on the color of the deposited layers, the thickness of the layers was determined and sampling was down from each layer to determine the particle size distribution. The fractal relationship of Bird et al. Provides better results than other relationships. In all three check dams, the fractal has increases and decreases from the top to bottom layers and does not change uniformly. In check dam 79 and 80, there is a significant negative and positive relationship between the fractal dimensions with the percentage of gravel and sand respectively. In check dam 81, the fractal dimension has negative relation with gravel and positive to sand. Generally, soils with less gravel particles and more sand have more fractal dimension. Comparison of the sedimentary layers of check dam 79, 80 and 81 shows that the process between the fractal dimensional return points and the sand particles is similar to the linear trend of sand particles.