Improving process representation and numerics for integrated hydrological modeling at the subsurface/land surface/atmosphere interface

改进地下/地表/大气界面综合水文建模的过程表示和数值

• 批准号: RGPIN-2015-04911
• 负责人: Paniconi, Claudio
• 金额: $ 2.04万
• 依托单位: Institut national de la recherche scientifique
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=682449
• 关键词: Improving; process; representation; numerics; integrated

The proposed research will focus on the development and application of simulation models at the subsurface/land surface/atmosphere interface. The objective will be to advance the state of the art in integrated hydrological and ecohydrological modeling from both physical (process representation and parameterization) and numerical (robustness, accuracy, and efficiency) perspectives. The work will be based on one of only a handful of accepted, fully-distributed, physically-based, coupled hydrological models that use advanced computational algorithms to resolve the governing mass conservation equations for surface and subsurface water flow and solute transport. The main themes of the work, which will also be the bases for individual PhD and postdoctoral research projects, will include: mass transfer and transport phenomena of varying complexity; incorporation of additional ecohydrological processes into the existing model; proper resolution of exchange or coupling terms between different subsystems; extension of the model's existing ensemble framework, implemented for data assimilation, to parameter estimation and sensitivity analysis; and applications of the model across multiple and nested scales, from field plot to river basin. Challenges in integrated, process-based hydrological modeling related to heterogeneity, grid resolution effects, competing submodel or parameterization schemes, strong nonlinearities, and boundary conditions will be addressed. Model performance will be assessed for different state variables, both integrated measures such as flow rate and solute concentration at the discharge outlet, total system water storage and solute mass, and total groundwater recharge, and distributed responses such as soil moisture, mass concentration, and exchange fluxes at different points along a sensor network. The project will rely on the availability of detailed, multivariate observation data from experimental hillslope and watershed scale study sites. The research will be highly collaborative at an international level and will include participation in multidisciplinary field experiments and model intercomparison and benchmarking studies. There is high demand in the research community for reliable, extendable, open source codes that can resolve integrated ecohydrological processes based on consistent and rigorous physical (and chemical/biological), mathematical, and numerical principles. The proposed research will result in improved simulation models to help us deepen our understanding of complex natural phenomena, of how different processes interact, and of how these systems can be impacted by anthropogenic stresses and other factors.**

拟议的研究将重点关注地下/地表/大气界面模拟模型的开发和应用。目标是从物理（过程表示和参数化）和数值（稳健性、准确性和效率）角度推进综合水文和生态水文建模的最新技术。这项工作将基于少数几个公认的、完全分布式、基于物理的耦合水文模型之一，这些模型使用先进的计算算法来求解地表和地下水流以及溶质输送的控制质量守恒方程。这项工作的主题也将成为个人博士和博士后研究项目的基础，其中包括：不同复杂性的传质和传输现象；将额外的生态水文过程纳入现有模型；正确解决不同子系统之间的交换或耦合项；模型现有集成框架的扩展，用于数据同化、参数估计和敏感性分析；以及该模型在多个嵌套尺度上的应用，从田间地块到河流流域。将解决与异质性、网格分辨率效应、竞争子模型或参数化方案、强非线性和边界条件相关的基于过程的综合水文建模的挑战。模型性能将针对不同的状态变量进行评估，包括排放口的流量和溶质浓度、总系统水储存和溶质质量以及地下水补给总量等综合测量，以及传感器网络沿线不同点的土壤湿度、质量浓度和交换通量等分布式响应。该项目将依赖于来自实验山坡和流域规模研究地点的详细、多变量观测数据。该研究将在国际层面上进行高度协作，并将包括参与多学科现场实验以及模型比对和基准研究。研究界对可靠、可扩展、开源代码的需求很高，这些代码可以基于一致且严格的物理（和化学/生物）、数学和数值原理解决综合生态水文过程。拟议的研究将改进模拟模型，帮助我们加深对复杂自然现象、不同过程如何相互作用以及这些系统如何受到人为压力和其他因素影响的理解。 **