IMPACT OF THARTHAR WATER ON COMPOSITION AND DIVERSITY OF COPEPODA IN TIGRIS RIVER.

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River channel confluences play a major role in the dynamics of all fluvial systems and are ubiquitous, fundamental elements of natural drainage networks. Rivers at channel confluences produce a complex hydrodynamic and morphodynamic environment within fluvial systems; inside the confluence, the tributaries flows mutually deflect each other, this in pressure gradients created by the spatial pattern of water-surface elevations that steers the confluent flows into the receiving channel. The portion of the river system that is affected by the merging of flows at a junction is defined as Confluence Hydrodynamic Zone (CHZ). The four common factors that influence CHZ, the symmetry of the junction, the junction angle, the momentum flux ratio of the incoming flows, and channel bed morphology .

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