Ecological scheduling method for controlling water bloom by adjusting incoming flow amount of branch upstream

Abstract

The invention relates to an ecological scheduling method for controlling water bloom by adjusting the incoming flow amount of a branch upstream. The method comprises the following steps: adjusting theincoming flow amount of the branch upstream according to the change of a water level in a reservoir area, and the status adjustment of the incoming flow temperature of a branch reservoir bay and thebranch upstream, forming an intermediate layer backflow or not layered flow state in a water bloom frequent occurrence area, or reducing the backflow intensity of a surface layer so as to inhibit theburst of the water bloom. On the basis of deeply researching the water bloom bursting principle of the river-type reservoir branch and the change rule of the flow state in the water bloom frequent occurrence area, the ecological scheduling method for preventing and controlling the water bloom by adjusting the incoming flow amount of the branch upstream and forming the flow state unfavorable for the bursting of the water bloom in the water bloom frequent occurrence area according to the change of the water level in the reservoir area is provided. Compared with the method of regulating and controlling the water level in the reservoir area, the method of changing the incoming flow amount of the branch upstream is more actually feasible, and the water bloom can be more scientifically and reasonably prevented and controlled.

Description

technical field [0001] The invention relates to an ecological regulation method for controlling the flow of algal blooms by adjusting the upstream of tributary streams, which is a method for water environment protection and ecological regulation, and a method for controlling the outbreak of algal blooms from the perspective of hydrodynamics. Background technique [0002] River-type reservoirs in economically developed areas have a large pollution load and high nutrient concentration in the water body. After the reservoir is impounded, the flow velocity of the main stream is relatively high, while the flow velocity in the backwater area (reservoir bay) of the tributaries is significantly reduced, resulting in frequent algal blooms. For example, since the Three Gorges Reservoir was impounded in 2003, algae blooms of various scales have occurred throughout the year in the bays of major primary tributaries such as the Xiangxi River, Daning River, and Shennong River. Algal blooms...

AI Technical Summary

Problems solved by technology

However, the eutrophication of river-type reservoirs is mainly related to the overall non-point source pollution of the upstream basin and the internal source pollution of the reservoir area, which is difficult to achieve in the short term

The second category is to reduce the algae biomass in the water body by means of physical salvage, chemical precipitation, and biological manipulation. These methods can temporarily alleviate the intensity of algal blooms to a certain extent; Not sure, there is a certain ecological risk

However, it has been proved that when the upstream flow of tributaries is relatively large during the flood season or the discharge period, the rapid rise of the water level in the reservoir area will produce strong surface backflow and lead to algal blooms

In addition, for large reservoirs such as the Three Gorges and Xiangjiaba, a large increase or decrease in the water level of the reservoir area in a short period of time will have a wide range of influence, and there are certain safety hazards; in addition, the reservoir also undertakes multiple functions such as flood control, power generation, navigation, and water replenishment , the reservoir scheduling needs to comprehensively consider the above factors, and it is difficult to realize frequent and large changes in the water level of the reservoir area

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