Incorporating seasonal and extreme hydrologic events into groundwater recharge and vulnerability assessment

将季节性和极端水文事件纳入地下水补给和脆弱性评估

• 批准号: 41885-2010
• 负责人: Rudolph, David
• 金额: $ 2.55万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 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=568871
• 关键词: Incorporating; seasonal; extreme; hydrologic; events

The security and sustainability of groundwater resources at the regional scale depend on the development of realistic source protection strategies and accurate estimates of natural replenishment or recharge, a parameter that has proven to be extremely difficult to quantify at the regional scale. The influence of transient hydrologic conditions on groundwater vulnerability and recharge is rarely accounted for yet may represent one of the most critical controlling parameters. For example, seasonal climatic variability and extreme hydrologic conditions, such as major precipitation events and mid-winter snow melt periods, can significantly influence recharge distribution and magnitude over the course of an annual cycle. Extreme hydrologic variability can also represent a major factor in introducing surface sources of contamination into the subsurface. This is particularly evident and critical in agricultural landscapes where diverse non-point sources exist ranging from nutrient solutes to colloidal pathogens. Climatic evidence suggests that the frequency of occurrence of these types of extreme hydrologic events is increasing in Canada and worldwide, potentially due to the influence of climate change. The main objective of this proposed research program is to investigate and quantify the impact of seasonal hydrologic variability on estimates of regional groundwater recharge and source vulnerability assessment. The research work will involve field experimentation to collect dense, integrated data sets designed to permit the quantification of recharge and contaminant mass flux throughout the course of the annual climatic cycle and numerical analysis using emerging models that can incorporate transient hydrologic complexity including climatic variability, fully integrated groundwater-surface water interaction, and temperature and contaminant transport under conditions of variably saturation in a three dimensional framework. The results of the research program will be immediately useful to provincial and municipal authorities in developing long-term groundwater management and source protection plans and in establishing science-based policies governing land use management related to emerging groundwater protection legislation.

地下水在区域规模上的安全性和可持续性取决于实际的源保护策略的发展以及对自然补给或补给的准确估计，该参数被证明在区域规模上很难量化。瞬态水文条件对地下水脆弱性和补给的影响很少被解释为最关键的控制参数之一。例如，季节性的气候变异性和极端的水文条件（例如重大降水事件和冬季降雪期）在整个周期的过程中会显着影响补给分布和幅度。极端的水文变异性也可以代表将污染表面源引入地下的主要因素。这在农业景观中尤其明显和至关重要，在农业景观中存在从营养溶质到胶体病原体的各种非点源。气候证据表明，加拿大和世界范围内这些类型的极端水文事件的发生频率正在增加，这可能是由于气候变化的影响。该提出的研究计划的主要目的是调查和量化季节性水文变异性对区域地下水补给估计和来源脆弱性评估的影响。研究工作将涉及现场实验，以收集旨在允许在整个年度气候周期和数值分析过程中使用新兴模型来定量补给和污染物质量通量，这些模型可以结合气候变化，包括气候变化，包括完全集成的地下水互动，温度和温度的污染型号，包括variaia dorvarme dovarty a varmity sates a vormanter a varly Armul of varrys a vormant of varmect of varmity satry a vormant satryply of varly satryply of varly a varly satryply of varly comply of varly satryply of varly satry。该研究计划的结果将对省和市政当局立即有用，以制定长期地下水管理和来源保护计划，并制定基于科学的政策，管理与新兴地下水保护立法有关的土地利用管理。