Cha Sung Min, Ham Young Sik, Ki Seo Jin, Lee Seung Won, Cho Kyung Hwa, Park Yongeun, Kim Joon Ha
Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 500-712, South Korea.
Water Sci Technol. 2009;59(11):2101-9. doi: 10.2166/wst.2009.241.
Greater efforts to provide alternative scenarios are key to successful urban stream restoration planning. In this study, we discuss two different aspects of water quality management schemes, biodegradation and human health, which are incorporated in the restoration project of original, pristine condition of urban stream at the Gwangju (GJ) Stream, Korea. For this study, monthly monitoring of biochemical oxygen demand (BOD(5)) and fecal indicator bacteria (FIB) data were obtained from 2003 to 2008 and for 2008, respectively, and these were evaluated to explore pollutant magnitude and variation with respect to space and time window. Ideal scenarios to reduce target pollutants were determined based on their seasonal characteristics and correlations between the concentrations at a water intake and discharge point, where we suggested an increase of environmental flow and wetland as pollutants reduction drawing for BOD(5) and FIB, respectively. The scenarios were separately examined by the Qual2E model and hypothetically (but planned) constructed wetland, respectively. The results revealed that while controlling of the water quality at the intake point guaranteed the lower pollution level of BOD(5) in the GJ Stream, a wetland constructed at the discharge point may be a promising strategy to mitigate mass loads of FIB. Overall, this study suggests that a combination of the two can be plausible scenarios not only to support sustainable urban water resources management, but to enhance a quality of urban stream restoration assignment.
加大力度提供替代方案是城市溪流修复规划成功的关键。在本研究中，我们讨论了水质管理方案的两个不同方面，即生物降解和人类健康，这两个方面被纳入了韩国光州（GJ）溪流原始、 pristine状态的修复项目中。在本研究中，分别于2003年至2008年以及2008年每月获取生化需氧量（BOD(5)）和粪便指示菌（FIB）数据，并对这些数据进行评估，以探究污染物的量级以及在时空窗口方面的变化。根据目标污染物的季节特征以及取水点和排放点浓度之间的相关性，确定了降低目标污染物的理想方案，其中我们分别建议增加环境流量和湿地作为降低BOD(5)和FIB的污染物削减措施。这些方案分别通过Qual2E模型和假设（但已规划）构建的湿地进行了检验。结果表明，虽然控制取水点的水质可确保GJ溪流中BOD(5)的污染水平较低，但在排放点构建湿地可能是减轻FIB质量负荷的一种有前景的策略。总体而言，本研究表明，将两者结合可能是合理的方案，不仅有助于支持可持续的城市水资源管理，还能提高城市溪流修复任务的质量。
