Integrated surface-subsurface hydrologic modelling of fluid flow, mass and heat transport

流体流动、质量和热量传输的综合地表-地下水文模型

• 批准号: 109542-2010
• 负责人: Sudicky, Edward
• 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: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=451439
• 关键词: Integrated; surface; subsurface; hydrologic; modelling

Fluid flow and spreading patterns of contaminants or thermal energy in groundwater and surface water systems are strongly influenced by the spatial variability of hydraulic parameters, multi-component chemical reaction processes and atmospheric inputs, both in the surface and subsurface flow domains. In the context of surface and subsurface flow regimes, which are inherently coupled, realistic computational models designed to predict overland, stream and variably-saturated subsurface flow rates and contaminant and thermal energy exchange fluxes must also accommodate complex topography, spatial and temporal variations in land use/land cover, episodic or long-term forcing functions (e.g., individual precipitation events, long-term climate change, contaminant and thermal energy loadings), all at the sub-watershed to watershed to continental scales in three dimensions. These forms of space-time heterogeneity have a profound bearing on issues such as prediction uncertainty, the design of suitable short- and long-term monitoring programs and the efficacy of alternative remediation/adaptation strategies. Our recent strides in computational hydrogeology/hydrology to address problems involving strongly coupled systems have now positioned us to explore many of the salient issues at hand, due to physical and chemical heterogeneity, in unprecedented detail in 3D at scales ranging from tens to thousands of square kilometres and beyond. In order to gain insight into the behaviour of both dissolved and immiscible contaminants and atmospheric/surface/subsurface exchange processes in heterogeneous surface/subsurface systems, high-resolution numerical simulations of a variety of contemporary problems facing surface water and groundwater scientists, including model applications to well-monitored watersheds, will be performed. Monte Carlo stochastic and adjoint sensitivity analyses are planned to address data-worth issues. The proposed research will focus on both water quantity and quality issues in coupled surface/subsurface flow systems. My research group is also actively developing new 3D numerical solution strategies to the highly nonlinear partial differential equations describing fluid flow, mass and heat transport.

地下水和地表水系统中的流体流动和污染物或热能的扩散模式受到地表和次表层流域中水力参数、多组分化学反应过程和大气输入的空间变异性的强烈影响。在地表和地下水流状态的背景下，这是内在耦合的，设计用于预测地表、河流和可变饱和地下流速以及污染物和热能交换通量的现实计算模型还必须适应复杂的地形、土地利用/土地覆盖的空间和时间变化、偶发或长期强迫函数（例如，单个降水事件、长期气候变化、污染物和热能负荷），所有这些都是分流域到流域到大陆的三维尺度。这些形式的时空异质性对诸如预测不确定性、适当的短期和长期监测方案的设计以及替代补救/适应战略的效力等问题有着深远的影响。我们最近在计算水文地质学/水文学方面取得的进展，以解决涉及强耦合系统的问题，现在使我们能够探索手头的许多突出问题，由于物理和化学的异质性，在三维中以前所未有的细节，规模从几十到几千平方公里及以上。为了深入了解溶解和不混溶的污染物的行为和大气/地表/地下交换过程中的异质表面/地下系统，高分辨率数值模拟的各种当代问题面临的地表水和地下水科学家，包括模型应用到监测良好的流域，将进行。计划进行蒙特卡罗随机和伴随敏感性分析，以解决数据价值问题。拟议的研究将集中在耦合表面/地下流系统的水量和水质问题。我的研究小组还积极开发新的三维数值求解策略，以描述流体流动，质量和热量传输的高度非线性偏微分方程。