%0 Journal Article %T Investigating the Effect of the Density and Pattern of Roughness Blocks with Obstacle on the Control of Density Current Head %J Journal of Hydraulics %I Iranian Hydraulic Association %Z 2345-4237 %A khosropour, soleyman %A Kashefipour, Seyed Mahmood %A daryaee, mehdi %D 2019 %\ 07/23/2019 %V 14 %N 2 %P 105-115 %! Investigating the Effect of the Density and Pattern of Roughness Blocks with Obstacle on the Control of Density Current Head %K Density current %K Bed slope %K Roughness pattern %K Roughness density %K Control percentage %R 10.30482/jhyd.2019.172751.1367 %X The present paper investigated the simultaneous effect of the density and pattern of bed roughness with obstacle on the control of a dense current head. The tests were run in a flume (length 720 cm, width 35 cm, and height 70 cm) using two roughness patterns (parallel and zigzag), and with four roughness densities (0%, 10%, 30%, and 50%). In all tests, the dense fluid was assumed to be of the salt type with a density of 20 g/lit. Two series of tests were performed using rough surfaces with and without obstacle. In total, 56 tests were conducted. The results showed that in all of the tested sloped, for the zigzag pattern, the highest control for the head of the dense current occurred at a density of 30%; while this density value was 10% for the parallel pattern. Moreover, using an obstacle in addition to roughness increased the control of the density current head. The mean control percentage in the tested slopes was 97% for the zigzag pattern at a density of 30% compared to the mode without roughness and with a zero percent slope; however this mean control percentage increased to 163% by implementing an obstacle. Further, in the parallel pattern with a density of 10%, the mean control percentage for the modes without and with an obstacle were respectively 44% and 74%. %U https://jhyd.iha.ir/article_92212_cd0e15b6c029dd20ff9690bf542ee0fd.pdf