Integrated surface-subsurface hydrologic modelling of 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传播模式受到地表和地下水流领域水力参数、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。地表和地下水流制度本身是相互耦合的，为了预测陆地、河流和可变饱和的地下水流速率以及污染物和热能交换通量，现实的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、阶段性或长期的强迫作用(如个别降水事件、长期气候变化、污染物和热能负荷)，所有这些都在次流域到分水岭到大陆的尺度上。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，现在使我们能够在数十至数千平方公里甚至更大的范围内，以前所未有的详细3D形式，探索由于物理和化学不均而带来的许多突出问题。为了深入了解不同地表/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，包括对监测良好的分水岭的模型应用。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地表/地下水流耦合系统中的水量和水质问题。我的研究小组还在积极开发新的3D数值求解策略，用于描述流体流动、质量和热传输的高度非线性偏微分方程组。

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.