Improving landscape indicators for monitoring heavy metal concentrations in urban streams

改善监测城市溪流中重金属浓度的景观指标

• 批准号: 531178-2018
• 负责人: Gergel, Sarah
• 金额: $ 0.91万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Engage Plus Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=651708
• 关键词: Improving; landscape; indicators; monitoring; heavy

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.

由于城市雨水径流的重金属浓度通常**高于以其他土地覆盖类型为主的流域的重金属浓度，所以城市流域的重金属污染往往很严重，**对水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担忧。污染可能会影响溪流生物群以及贝类和**在底质中生活或觅食的无脊椎动物。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目前的雨水管理**方法。此外，道路是影响重金属浓度的城市景观的一个关键特征。因此，我们使用高空间分辨率的城市土地覆盖，在研究区域内的不同道路**特征(例如，本地道路、收集器、主干道)之间提供更大的区分度，然后将这些景观指标与温哥华大都会区**溪流中铜(铜)、铅(铅)、锌(锌)、镍(Ni)、镉(Cd)和铬(Cr)的浓度联系起来。此外，还将绘制城市排水系统(如集水池、滞留池塘和溪流的**排污口)的地图，因为它们已被确定为对污染物运输很重要。因此，使用改进的景观指标调查城市溪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，可以在支持增长和城市扩张的同时，**维护其城市溪流的生态健康。