Environmental Geology Group, School of Geosciences, Sydney University, Sydney, NSW 2006, Australia.
Environmental Geology Group, School of Geosciences, Sydney University, Sydney, NSW 2006, Australia.
Environ Pollut. 2014 May;188:172-6. doi: 10.1016/j.envpol.2014.01.014. Epub 2014 Feb 13.
Irregular discharges of polluted stormwater into drainage systems during base flow (no rainfall) result in acute ecological impacts within fluvial and estuarine environments. In this study, metal and TSS concentrations were significantly more variable during business hours of weekdays (i.e. high-business activity) than weekends/public holidays (i.e. low-business activity) within three highly-urbanised catchments of Sydney estuary (Australia), as determined by analysing multivariate dispersion (PERMDISP). Concentrations of TSS and all metals analysed (Al, Ca, Cu, Fe, Mg, Pb and Zn) were also significantly greater during high- than low-business periods within at least one of the three catchments. In no case were concentrations significantly higher during low- than high-business periods. This pattern of contamination supports the hypothesis that commercial and industrial sources are major contributors of irregular discharges of contamination to Sydney estuary. Irregular discharges and consequential ecological impacts may be effectively reduced in this environment by focussing management efforts on these activities.
在基流（无降雨）期间，受污染的雨水不规则排放到排水系统中，导致河流和河口环境中出现急性生态影响。在这项研究中，通过分析多元分散（PERMDISP），在悉尼河口的三个高度城市化流域中，工作日（即高商业活动）期间的金属和 TSS 浓度比周末/公共假日（即低商业活动）期间的变化明显更大。在至少一个流域中，TSS 和分析的所有金属（Al、Ca、Cu、Fe、Mg、Pb 和 Zn）的浓度在高商业时期也明显高于低商业时期。在任何情况下，低商业时期的浓度都没有明显高于高商业时期。这种污染模式支持了这样一种假设，即商业和工业来源是向悉尼河口不规则排放污染的主要贡献者。通过将管理工作集中在这些活动上，这种环境中的不规则排放和由此产生的生态影响可能会得到有效减少。
