The Influence of Hydrodynamic Conditions on Algal Bloom in the Three Gorges Reservoir Tributaries

Abstract

Water level has risen considerably since the impounding of Three-Gorges Reservoir in year 2003 and that might broaden and deepen the Yangtze River and the tributary of Three Gorge, will greatly slowdown the flow velocity to change hydrodynamic conditions. This changes Influence the Water Environment of Yangtze River and the tributary of Three Gorges Reservoir, especially eutrophication and algal bloom of the tributaries in Three Gorges Reservoir in recent years. For studying the course of algal bloom in the tributaries of Three Gorges Reservoir and the comprehensive prevention countermeasures, about the hydrodynamics of Yangtze River main stream and tributary in Three Gorges Reservoir must be carefully researched. In this article, general situation of the algal bloom of the tributaries in Three Gorges Reservoir were presented, and analysed on characteristics and influencing factors of breakout of algal bloom from certain self-conditions changes before and after impoundment of the Three Gorges reservoir, knowing that lower the nutrient input and improve water flow regime and flow velocity behaviors are the main measures of comprehensive prevention countermeasures of algal bloom in the tributaries of Three Gorges Reservoir; This research status of influence mechanism of hydrodynamic conditions on algal bloom and the research tendency of the tributaries’ hydrodynamic conditions on algal bloom in Three Gorges Reservoir were reviewed, which provided certain theory reference for study and prevention countermeasures of algal bloom in the Three Gorges Reservoir tributaries.