Groundwater Recharge within the Agricultural Landscape in a Changing Climate

气候变化下农业景观中的地下水补给

• 批准号: RGPIN-2022-03674
• 负责人: Rudolph, David
• 金额: $ 3.13万
• 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: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=750860
• 关键词: Groundwater; Recharge; within; Agricultural; Landscape; Groundwater; Recharge; within; Agricultural; Landscape

Summary The sustainable management of freshwater resources has become more challenging globally as a result of increasing demand, changes in land use and an uncertain climate. Quantifying the water balance is a fundamental component of watershed management with respect to the availability of clean water for both human and ecological use. A major component of the regional water balance is groundwater recharge, which directly controls the replenishment of subsurface reservoirs, the loading of surface contaminants and the timing and magnitude of surface water base flow. Due to the highly variable nature of groundwater recharge, it has been difficult to measure and quantify and is associated with a high degree of uncertainty. The magnitude, timing and spatial distribution of recharge is influenced by land use, topographic setting, subsurface geology and seasonal climatic conditions, particularly within rural regions where the majority of recharge occurs. With the increasing need to maximize crop production, agricultural drainage management is being implemented at a regional scale, including the installation of extensive tile drainage networks, which significantly influence the water balance within the agricultural landscape. In many northern countries, groundwater resources are extensively drawn from these rural regions, commonly from undulating glacial terrain where recharge patterns are complex. In addition, the impacts of climate warming are fundamentally influencing recharge dynamics in ways that are poorly understood. The proposed research program includes three main components. The first examines the interaction between tiles and the shallow groundwater flow system under a range of subsurface and climatic conditions with a specific focus on groundwater recharge. Detailed field investigations and legacy data sets will be integrated into advanced mathematical models to evaluate a wide range of scenarios designed the reveal the complex interaction between tile drains and the shallow subsurface. In the second component, the influence of depression focused recharge phenomena, which form following extreme precipitation events in low topographic settings, will be quantified through field investigations and advanced simulation tools to investigate the potential impact of these recharge phenomena on aquifer and public supply well vulnerability. The final component will integrate insight from the first two sections into a regional analysis of the combined influence of tile drainage, depression focused recharge and climate change on groundwater recharge with a specific emphasis on the regional water balance and the sustainability of groundwater resources. The overall results will assist water managers in understanding how the regional water balance is changing under the influence of managed agricultural drainage and climate change and inform future water management policy.

总结，由于需求不断增长，土地使用变化和不确定的气候，淡水资源的可持续管理在全球范围内变得越来越具有挑战性。量化水平衡是分水岭管理的基本组成部分，就人类和生态用途的清洁水的可用性而言。区域水平衡的主要组成部分是地下水充电，它直接控制地下储层的补充，地面污染物的负载以及地表水碱基流量的时间和幅度。由于地下水充电的高度可变，因此很难测量和量化，并且与高度的不确定性有关。充值的大小，时机和空间分布受土地使用，地形环境，地下地质和季节性气候条件的影响，尤其是在大多数充电发生的农村地区。随着最大程度地生产作物的需求，农业排水管理正在以区域规模实施，包括安装广泛的瓷砖排水网络，这极大地影响了农业景观中的水平。在许多北部国家，地下资源是从这些农村地区广泛汲取的，通常来自起伏的冰川地形，那里的充电模式很复杂。此外，气候变暖的影响从根本上影响了充满理解的补给动态。拟议的研究计划包括三个主要组成部分。第一个检查瓷砖与浅层地下水流系统之间的相互作用在一系列地下和气候条件下，特别关注地下水补给。详细的现场调查和旧数据集将集​​成到高级数学模型中，以评估广泛的方案设计了揭示瓷砖排水沟与浅层地面之间的复杂相互作用。在第二部分中，将通过现场调查和先进的仿真工具来量化抑郁症聚焦现象的影响，后者将在低地形环境中极端降水事件进行量化，以研究这些充值现象对含水层和公共供应较大脆弱性的潜在影响。最终组成部分将将前两个部分的洞察力整合为对瓷砖排水，集中抑郁症充电和气候变化对地下水充电的综合影响的区域分析，并特别强调区域水平衡和地下水的可持续性。总体结果将有助于水管理人员了解在托管农业排水和气候变化的影响下，区域水平衡如何变化，并为未来的水管理政策提供信息。