The effect of using elliptical collar in reduction of scour around bridge pier

Among the methods which can be used for preventing the sediment deposition is self-cleansing in the structure. In the first of this research, a general relationship for conditions of self-cleansing in open channel and inverted siphons was developed by applying the dimensional analysis. Then experimental tests were conducted by using two experimental models and 14 non-cohesive sediment with different dimensions of 0.2 to 4.4 mm in three channel bed’s slopes of 0.5, 1 and 1.5 percent and four different bed slopes of 0.0, 8.0, 16, and 24 degrees for horizontal and outlet conduit of inverted siphon. Two graphs were drown that can be used for determining the condition of self-cleansing in open channel and horizontal and outlet conduit of inverted siphon. Then, by using these graphs and suspended load particle size distribution curves of the Karkheh River in Paypol station, the self-cleansing velocity was extracted for preventing the deposition of sediment particles with diameters less than 2 mm that is the largest particle size observed in Paypol channel and their inverted siphons.Among the methods which can be used for preventing the sediment deposition is self-cleansing in the structure. In the first of this research, a general relationship for conditions of self-cleansing in open channel and inverted siphons was developed by applying the dimensional analysis. Then experimental tests were conducted by using two experimental models and 14 non-cohesive sediment with different dimensions of 0.2 to 4.4 mm in three channel bed’s slopes of 0.5, 1 and 1.5 percent and four different bed slopes of 0.0, 8.0, 16, and 24 degrees for horizontal and outlet conduit of inverted siphon. Two graphs were drown that can be used for determining the condition of self-cleansing in open channel and horizontal and outlet conduit of inverted siphon. Then, by using these graphs and suspended load particle size distribution curves of the Karkheh River in Paypol station, the self-cleansing velocity was extracted for preventing the deposition of sediment particles with diameters less than 2 mm that is the largest particle size observed in Paypol channel and their inverted siphons.Among the methods which can be used for preventing the sediment deposition is self-cleansing in the structure. In the first of this research, a general relationship for conditions of self-cleansing in open channel and inverted siphons was developed by applying the dimensional analysis. Then experimental tests were conducted by using two experimental models and 14 non-cohesive sediment with different dimensions of 0.2 to 4.4 mm in three channel bed’s slopes of 0.5, 1 and 1.5 percent and four different bed slopes of 0.0, 8.0, 16, and 24 degrees for horizontal and outlet conduit of inverted siphon. Two graphs were drown that can be used for determining the condition of self-cleansing in open channel and horizontal and outlet conduit of inverted siphon. Then, by using these graphs and suspended load particle size distribution curves of the Karkheh River in Paypol station, the self-cleansing velocity was extracted for preventing the deposition of sediment particles with diameters less than 2 mm that is the largest particle size observed in Paypol channel and their inverted siphons.Among the methods which can be used for preventing the sediment deposition is self-cleansing in the structure. In the first of this research, a general relationship for conditions of self-cleansing in open channel and inverted siphons was developed by applying the dimensional analysis. Then experimental tests were conducted by using two experimental models and 14 non-cohesive sediment with different dimensions of 0.2 to 4.4 mm in three channel bed’s slopes of 0.5, 1 and 1.5 percent and four different bed slopes of 0.0, 8.0, 16, and 24 degrees for horizontal and outlet conduit of inverted siphon. Two graphs were drown that can be used for determining the condition of self-cleansing in open channel and horizontal and outlet conduit of inverted siphon. Then, by using these graphs and suspended load particle size distribution curves of the Karkheh River in Paypol station, the self-cleansing velocity was extracted for preventing the deposition of sediment particles with diameters less than 2 mm that is the largest particle size observed in Paypol channel and their inverted siphons.Among the methods which can be used for preventing the sediment deposition is self-cleansing in the structure. In the first of this research, a general relationship for conditions of self-cleansing in open channel and inverted siphons was developed by applying the dimensional analysis. Then experimental tests were conducted by using two experimental models and 14 non-cohesive sediment with different dimensions of 0.2 to 4.4 mm in three channel bed’s slopes of 0.5, 1 and 1.5 percent and four different bed slopes of 0.0, 8.0, 16, and 24 degrees for horizontal and outlet conduit of inverted siphon. Two graphs were drown that can be used for determining the condition of self-cleansing in open channel and horizontal and outlet conduit of inverted siphon. Then, by using these graphs and suspended load particle size distribution curves of the Karkheh River in Paypol station, the self-cleansing velocity was extracted for preventing the deposition of sediment particles with diameters less than 2 mm that is the largest particle size observed in Paypol channel and their inverted siphons.