Department of Civil Engineering, National Taipei University of Technology, Taipei City, 106, Taiwan.
Department of Leisure and Recreation Management, Kainan University, Taoyuan City, 338, Taiwan.
Environ Monit Assess. 2019 Jan 25;191(2):100. doi: 10.1007/s10661-019-7246-1.
Rivers are an important urban resource, and water quality influences the use of river water. Thus, analyzing spatiotemporal variations in river water quality is crucial for sustainable use and management of water resources in a highly urbanized region. This study employed river pollution index (RPI) data obtained in 2013 to assess spatiotemporal variations in river water quality for sustainable environmental and recreational management in the highly urbanized Danshui River basin. First, ordinary kriging was adopted to analyze monthly RPI distributions. Subsequently, different percentiles of monthly estimated RPI distributions were probabilistically determined at a river segment. Finally, three measurement methods of local uncertainty, namely-conditional variance, local entropy, and interquartile range-were used to characterize spatiotemporal variations in river water quality in the Danshui River basin. Assessment results revealed that more highly polluted river water quality resulted in higher seasonal variations. Moreover, high and very high seasonal variations were mainly concentrated in urban river segments, whereas low and very low seasonal variations were primarily located in upstream river segments. Thus, to achieve sustainable development goals, artificial wetlands should be established at downstream and midstream urban riverbanks and urban recreational activities should be developed in upstream riverbank parks in the Danshui River basin before the comprehensive improvement of river water quality.
河流是城市的重要资源，水质影响着河水的利用。因此，分析河流水质的时空变化对于高度城市化地区水资源的可持续利用和管理至关重要。本研究利用 2013 年获得的河流污染指数（RPI）数据，评估高度城市化的淡水河流域的河流水质时空变化，以实现可持续的环境和娱乐管理。首先，采用普通克里金法分析月度 RPI 分布。随后，在河流段上概率确定月度估计 RPI 分布的不同百分位数。最后，采用局部方差、局部熵和四分位距三种局部不确定性度量方法，描述淡水河流域河流水质的时空变化。评估结果表明，水质污染程度较高的河流具有较高的季节性变化。此外，高污染和极高污染的季节性变化主要集中在城市河段，而低污染和极低污染的季节性变化主要位于上游河段。因此，为了实现可持续发展目标，应在下游和中游城市河岸建立人工湿地，并在全面改善河流水质之前，在淡水河流域的上游河岸公园开展城市娱乐活动。
