Study on Calculations of Pollutant Adjustment Concentrations at Monitoring Sections in Water Function Zones under the Scene of Overproof Upstream Water

Abstract

In 2011 the pollution receiving capacity red-line policy in No.1 document of central government made new request on up-to-standard assessments of water function zones. As the key and difficulty work in practice, overproof upstream water normally leads to unfair assessment results of downstream water function zones. In this paper, for calculating pollutant adjustment concentrations to avoid overproof upstream water effects at sections in downstream water function zones, downstream situations are classified according to influences from upstream branches, upstream sewage outlets, or whether in flood season. Equations based on one-dimensional water quality model and pollutant input-response model were put forward to deal with these situations even though downstream sections are not monitored. Calculations above included pollutant decay process, pollutant input-response relation and non-point source pollution. The results show that equations could be used in up-to-standard assessments of water function zones and support water resources management well.