Numerical Study of the behavior Algorithm of pollutants movement in open channel hydraulics with compound cross-sections

ABSTRACT: Generally, knowledge and awareness of the way how two flows influence each other and the changes of one matter in a different liquid are among the significant issues in hydraulics. It is of great importance in hydraulics to know and identify the behaviors and distribution patterns of materials to study the likely happenings. This study attempted to investigate the spread and distribution patterns of pollutants in open channels in compound cross-sections (such as Cross-sections of Torrent) by means of pure and applied hydraulic methods. To this end, calculation were conducted through applying the classic equation of Computed hydraulics (one – dimensional model materials distribution in liquids).Then, the Shiono and Knight two – dimensional model was used to determine the hydraulic parameters of flow in the Ackeres hypothetical river by the software. Afterward, these parameters were applied to the one – dimensional transfer equation to investigate the materials density changes in the river for both spatial and temporal dimensions. Results revealed that if we apply the effect of flow between the channel and the Torrent section, the longitudinal propagation coefficient decreases because the amount of flow and its effective strength fall. Therefore, the determined density reaches the target location in the channel at a longer time period and a longer movement and the temporal distribution for transfer from the point of departure will be obtained