A study of mixing, water quality and ice cover formation in stormwater ponds

雨水池混合、水质和冰盖形成的研究

• 批准号: 451210-2013
• 负责人: Loewen, Mark
• 金额: $ 1.12万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=575391
• 关键词: study; mixing; water; quality; ice

In urban areas the presence of impervious surfaces results in greatly increased volumes and rates of surface runoff. Stormwater management lakes, or stormwater ponds, are used primarily to control the excess water by temporarily storing surface runoff and then releasing it at a decreased rate. Stormwater ponds are designed not only to reduce flooding but also to improve water quality by removing pollutants. Ponds are often located in urban subdivisions and their close proximity to residential dwellings creates two problems. First, poor water quality caused by algae blooms and excessive aquatic plant growth lead to frequent complaints from nearby residents about odours and the presence of unsightly pond scum. Second, residents find frozen stormwater ponds attractive for winter recreational activities such as skating, hockey and broomball but unpredictable ice cover behaviour makes these activities dangerous. Concerns about the safety of ice covers and the ongoing problems with nuisance algae blooms in Edmonton's stormwater ponds are the motivation for this research proposal. The objectives of the proposed research are to: (i.) Identify the causes of poor water quality in stormwater management ponds. (ii.) Evaluate methods to reduce algae growth in stormwater management ponds. (iii.) Identify the causes of ice cover variability in stormwater management ponds. We propose to achieve these objectives by conducting a two year field measurement program and by applying state-of-the-art numerical models to four Edmonton stormwater ponds. The field measurements will be used to determine the factors that control ice cover formation and algae growth. A coupled hydrodynamic-biogeochemical numerical model will be used to determine the causes of excess algae growth and to evaluate remediation methods to improve water quality. A hydrodynamic numerical model that includes a new ice cover algorithm will be used to predict ice cover formation and to determine the factors that cause pond ice covers to be unsafe.

在城市地区，不透水表面的存在导致地表径流量和速率大大增加。雨水管理湖或雨水池主要用于通过暂时储存地表径流，然后以较低的速度释放来控制多余的水。雨水池的设计不仅可以减少洪水，还可以通过去除污染物来改善水质。池塘往往位于城市分区，它们与住宅区的距离很近，造成了两个问题。首先，藻类大量繁殖和水生植物过度生长导致水质差，导致附近居民经常抱怨气味和难看的池塘浮渣。第二，居民发现冰冻的雨水池塘对滑冰、曲棍球和扫帚球等冬季娱乐活动很有吸引力，但不可预测的冰盖行为使这些活动变得危险。对冰盖安全性的担忧以及埃德蒙顿雨水池塘中令人讨厌的藻类大量繁殖的持续问题是这项研究提案的动机。拟议研究的目标是： （i.） 确定雨水管理池塘水质差的原因。 （二） 评估减少雨水管理池塘中藻类生长的方法。 （三）确定雨水管理池塘中冰盖变化的原因。 我们建议通过进行为期两年的实地测量计划和应用最先进的数值模型，以实现这些目标的四个埃德蒙顿雨水池。现场测量将用于确定控制冰盖形成和藻类生长的因素。一个耦合的水动力-生物地球化学数值模型将被用来确定藻类过度生长的原因，并评估改善水质的补救方法。一个水动力数值模型，包括一个新的冰盖算法将被用来预测冰盖的形成，并确定导致池塘冰盖是不安全的因素。