[Calculation of allowable pollution loads for lake and reservoir based on bi-direction algorithm and its case study]

Area of Science:

• Environmental Science
• Water Resource Management
• Environmental Engineering

Background:

• Challenges exist in estimating and allocating allowable pollutant loads in China's water environments.
• Existing methods for pollutant load management in lakes and reservoirs require improvement.

Purpose of the Study:

• To develop and validate a novel bi-direction algorithm for calculating allowable pollutant loads.
• To support effective pollutant load management in lake and reservoir control units.

Main Methods:

• A bi-direction algorithm combining forward and backward approaches was developed.
• The methodology involved modeling, scenario analysis, and iterative optimization.
• The Environmental Fluid Dynamic Code (EFDC) model was used for water quality simulation.

Main Results:

• The proposed algorithm efficiently calculates allowable pollutant loads.
• Scenario analysis and optimization refined the pollutant load calculations.
• The case study at Chaihe Reservoir demonstrated the algorithm's effectiveness.

Conclusions:

• The bi-direction algorithm offers an efficient and appropriate methodology for pollutant load calculation.
• This approach supports improved water quality management in lake and reservoir systems.
• The study provides a valuable tool for environmental protection in China.