Improving landscape indicators for monitoring heavy metal concentrations in urban streams

重金属污染在城市流域往往很明显，因为城市雨水径流一般 ** 比其他土地覆盖类型占主导地位的流域含有更高浓度的重金属，** 对水生生态系统造成严重后果。由于重金属的毒性和持久性，涉及重金属的污染特别令人关注。污染会影响河流生物群以及在底部基质中生活或觅食的贝类和无脊椎动物。在这里，我们通过开发适合于监测城市 ** 溪流中重金属浓度的景观指标来改进当前的雨水管理方法。此外，道路是影响重金属浓度的城市景观的关键特征。因此，我们使用高空间分辨率的城市土地覆盖，以提供更大的歧视不同的道路 ** 功能（如本地，收集器，主干道）在研究区域内，然后将这些景观指标的铜（Cu），铅（Pb），锌（Zn），镍（Ni），镉（Cd）和铬（Cr）的浓度在 ** 流整个大温哥华。此外，还将绘制城市排水系统（例如集水池、滞留池和 ** 河流排水口）的地图，因为它们已被确定为对污染物输送很重要。因此，使用改进的景观指标调查城市河流中的重金属浓度将进一步提高我们评估城市水生生态系统健康的能力。这种合作 ** 创造了一种适用于所有加拿大城市的监测方法，这些城市有兴趣保持 ** 城市河流的生态健康，同时支持增长和城市扩张。

Heavy metal contamination is often pronounced in urban watersheds as urban stormwater runoff generally**contains higher concentrations of heavy metals than that from watersheds dominated by other land cover types,**with serious consequences for aquatic ecosystems. Pollution involving heavy metals is of particular concern**due to their toxicity and persistence. Contamination can impact stream biota as well as shellfish and**invertebrates living or feeding in bottom substrates. Here, we improve upon current stormwater management**approaches by developing landscape indicators suited to monitoring heavy metal concentrations in urban**streams. Furthermore, roads are a key feature of urban landscapes that impacts heavy metal concentrations. As**such, we use high spatial resolution urban land cover to provide greater discrimination among different road**features (e.g. local, collector, arterial roads) within the study region and then link these landscape indicators to**concentrations of Copper (Cu), Lead (Pb), Zinc (Zn), Nickel (Ni), Cadmium (Cd) and Chromium (Cr) in**streams across Metro Vancouver. Additionally, urban drainage systems (e.g. catch basins, detention ponds, and**outfalls to streams) will also be mapped as they have been identified as important to contaminant transport. As**such, investigation of heavy metal concentrations in urban streams using improved landscape indicators will**provide further improvements to our ability to assessment urban aquatic ecosystem health. This collaboration**creates a monitoring approach applicable and transferable across all Canadian cities interested in maintaining**the ecological health of their urban streams while supporting growth and urban expansion.