Annular River Network Pollution Load Contribution Rate Calculation
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Solution Overview
Problem
Determining the contribution rate of pollution load in a water quality assessment section of an annular river network system is challenging due to the complex source, destination, and movement characteristics of water flow, which complicates the calculation of water quantity constituents.
Innovation Solution
A method is developed to determine the contribution rate of pollution load by calculating water quantity components, including rainfall runoffs, wastewater discharge, and water diversion, using a river network water quantity model that treats these components as conservative substances, and integrating hydrological and pollution load models to calculate weighted average concentrations and ratios, thereby overcoming the complexity of water flow in annular river networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the first method (setting pollutant discharge amount to 0 one by one) is used to calculate contribution rate, then the calculation can be performed, but the calculation efficiency is low and the research cycle is long
Solution Approach 1:
The patent segments the water quantity into multiple components (rainfall runoff, wastewater discharge, water diversion, etc.) and calculates the contribution rate of each component separately using water quantity constitute ratios. This allows parallel calculation of all pollution control units' contributions in one model run, resolving the contradiction between accuracy and efficiency.
2Productivity
If the second method (using water quantity constitute product with pollutant concentration) is used to calculate contribution rate, then the calculation efficiency is high, but the difficulty lies in determining ratios of water quantity components
Solution Approach 1:
The patent introduces conservative substances (substances that do not transform or react in the water system) as intermediaries to trace water quantity components. By tracking conservative substance concentrations, the water quantity constitute ratios can be determined indirectly through model calculation, resolving the difficulty of directly determining component ratios while maintaining high calculation efficiency.
3Measurement precision
If water quantity constitute is determined in annular river network, then the contribution rate can be calculated, but the complex source, destination and movement characteristics of water flow make it difficult to determine
Solution Approach 1:
The patent transforms the difficult problem of determining water quantity constitute in complex annular river networks into a parameter calculation problem. By changing the approach from direct flow tracking to calculating conservative substance concentration ratios based on water balance equations, the determination becomes feasible even in networks with uncertain flow directions and complex sources/destinations.
Data Source
AI summary
A method for determining a contribution rate of pollution load in a water quality assessment section of an annular river network system based on water quantity constitute comprises the following steps: defining all water quantity components (rainfall, pollution discharge and water diversion) according to a water quantity source condition of a river network water system in a research region; calculating a water quantity ratio of each water quantity component in each water quality assessment section; collecting flow rate of point source pollution and corresponding pollutant discharge amount, calculating a water quantity weighted average concentration of all point source pollutants, and calculating a runoff rate and a pollution load of all land use types and an average concentration of non-point source pollutants by utilizing a hydrological model and a pollution load model; and calculating the contribution rate of pollution load in the water quality assessment section.