A Study on the Estimation Method of Wetland Purification Capacity to Surface Runoff

Wetland is an important regulator of water quality, which has great potential for purifying water pollutants. This paper proposes two methods to estimate water quality purification capacity: the single-factor water quality purification rate and the comprehensive water quality purification rate. It takes the area, from Long´an Bridge to Zhaosanliangzi which lies at the end of Zhongyin main channel in Zhalong wetland, as the demonstration zone to study the water quality purification capacity of wetland. At the same time, by taking the inlet section, Long´an Bridge as the Control Section, and taking the outlet section, Zhaosanliangzi which is at the end of Zhongyin main channel, as the comparable section, we apply two estimation methods to analyze the purification capacity of Zhalong wetland to surface runoff, so as to show the advantages of the single-factor quality purification rate and the comprehensive water quality purification rate in estimating the water quality purification capacity of wetland.