Calculation and application of river environmental flow of Qingyi River Basin
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Abstract:
Considering the coexistence of environmental flow shortages and pollution problems of northern rivers, the concept and content of environmental flow were defined with consideration to water quality protection and water quantity maintenance. The composition of environmental flow under different functional goals was also discussed. By analyzing the characteristics of river systems and spatial structure features of river reaches, we established the environmental flow calculation model for improving water quality, and also established the Tennant and Wetted Perimeter models for calculating the environmental flow for river ecosystems. Using the hydrology and water quality data of Gaocun Bridge section, we conducted a preliminary evaluation of the environmental flow for improving the water quality and ecosystem of Qingyi River. This study provided flow regulatory advice for the emergency replenishment of water, and suggested the river flow levels that should be maintained constantly in different months of a year.
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