Feng Lan, Hu Pan, Chen Ming-Ming, Li Bai-Lian
College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China; Ecological Complexity and Modeling Laboratory, Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA.
College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China.
Sci Total Environ. 2023 Nov 20;900:165608. doi: 10.1016/j.scitotenv.2023.165608. Epub 2023 Jul 18.
Small floodgates in the river network area own some characteristics: considerable quantity, wide range and short adjustment time, and intercepts the one-dimensional constant flow of rivers, which induce a great impact on riverine water quality. In this study, a typical urban floodgate-controlled reach was selected, and analyzed through the monthly data of four pollutant indicators TN, TP, COD and NH-N at six sampling sites S1-S6 in 2016-2018. The principal component analysis and correlation analysis showed that TP was a representative indicator and there was a positive correlation between various pollutants. The difference test and linear regression showed that the concentration of pollutants at different sampling points varied greatly, and the pollutant concentrations in the longitudinal direction of the river showed a cubic-linear regression. The cluster system and CCME WQI showed that the water quality in the urban floodgate-controlled reach is "marginal" state, and TN and NH-N are severely exceeding the standard. The "cumulative changes" of the floodgate on the pollutant input to the environment appeared spatial heterogeneity.
河网地区的小型水闸具有数量可观、范围广泛、调节时间短等特点，拦截河流的一维恒定流，对河流水质产生很大影响。本研究选取了典型的城市水闸控制河段，通过2016 - 2018年在六个采样点S1 - S6的四个污染物指标TN、TP、COD和NH - N的月度数据进行分析。主成分分析和相关性分析表明，TP是代表性指标，且各污染物之间存在正相关。差异检验和线性回归表明，不同采样点的污染物浓度差异很大，河流纵向的污染物浓度呈三次线性回归。聚类系统和CCME WQI表明，城市水闸控制河段的水质处于“边缘”状态，TN和NH - N严重超标。水闸对环境污染物输入的“累积变化”呈现出空间异质性。
