Modeling the effects of constructed wetland on nonpoint source pollution control and reservoir water quality improvement

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• 作者：Jonghwa Ham ; Chun G. Yoon ; Hyung-Joong Kim ; Hyung-Chul Kim
• 关键词：constructed wetland ; estuarine reservoir ; integrated modeling system ; nonpoint source pollution control ; polder area ; water quality improvement
• 刊名：Journal of Environmental Sciences
• 出版年：2010
• 出版时间：June 2010
• 年：2010
• 卷：22
• 期：6
• 页码：834-839
• 全文大小：737 K

文摘

This article describes the integrated modeling approach for planning the size and the operation of constructed wetlands for maximizing retention of nonpoint source pollutant loads and reservoir water-quality improvement at a catchment scale. The experimental field-scale wetland systems (four sets, 0.88 ha each) have been in operation since 2002, where water depth was maintained at 30–50 cm and hydraulic loading rate was at 6.3–18.8 cm/day. The wetland system was found to be adequate for treating polluted stream water with stable removal effciency even during the winter. The integrated modeling system (modified-BASINS) was applied to the Seokmoon estuarine reservoir watershed and calibrated with monitoring data from constructed wetland, stream, and reservoir. The calibrated integrated modeling system estimated that constructing wetlands on 0.5 % (about 114 ha) of the watershed area at the mouth of reservoir could reduce 11.61 % and 13.49 % of total external nitrogen and phosphorus loads, respectively. It also might improve the nitrogen and phosphorus concentration of the reservoir by 9.69 % and 16.48 % , respectively. The study suggested that about 0.1 % –1.0 % of the watershed area should be allocated for constructed wetland to meet specified water-quality standards for the estuarine reservoir at the polder area where land use planning is relatively less complicated.