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

地下水和地表水系统中污染物或热能的流动和扩散模式受到地表和地下流域中水力参数、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。在地表和地下流动状况本身耦合的情况下，为预测地表、河流和可变饱和的地下流速以及污染物和热能交换通量而设计的现实计算模型还必须适应复杂的地形、土地利用/土地覆盖的时空变化、偶发或长期强迫函数（例如个别降水事件、长期气候变化、污染物和热能负荷）。从流域到流域到大陆的三维尺度。这些形式的时空异质性对预测的不确定性、适当的短期和长期监测计划的设计以及替代补救/适应策略的有效性等问题具有深远的影响。我们最近在解决涉及强耦合系统的计算水文地质学/水文学问题方面取得的进展，现在使我们能够探索手头的许多突出问题，由于物理和化学异质性，以前所未有的3D细节，范围从数万平方公里到数千平方公里甚至更远。为了深入了解非均质地表/地下系统中溶解和不混溶污染物的行为以及大气/地表/地下交换过程，将对地表水和地下水科学家面临的各种当代问题进行高分辨率数值模拟，包括对监测良好的流域的模型应用。蒙特卡罗随机和伴随灵敏度分析计划解决数据价值问题。建议的研究将集中在地表/地下耦合流动系统中的水量和水质问题。我的研究小组也在积极开发描述流体流动、质量和热传递的高度非线性偏微分方程的新的三维数值解策略。

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.