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: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=636909
• 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）和方面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的控制质量守恒方程。和地下该工作的主题也将成为个人博士和博士后研究项目的基础，包括：不同复杂性的质量传递和传输现象；将额外的生态水文学过程纳入现有模型；解决不同子系统之间的交换或耦合项；将模型现有的集成框架扩展到参数估计和敏感性分析；以及模型在多个和嵌套尺度上的应用，从田间地块到流域。融合的，与非均质性、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水文模型将针对不同的状态变量进行评估，包括流量和溶质浓度等综合测量。该项目将依赖于详细的多变量的可用性，包括排放口、总系统水储存和溶质质量、地下水补给总量，以及分布式响应，例如土壤湿度、质量浓度和传感器网络不同点的交换通量。实验山坡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较和基准研究，研究界对能够解决问题的可靠、可扩展、开源代码有很高的需求。基于一致和严格的物理（和化学/生物）、数学和数值原理的综合生态水文过程。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的理解。这些系统如何受到影响人为压力和其他因素。