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.**

拟议的研究将着重于在地下/地表/大气界面上模拟模型的开发和应用。目的是从物理（过程表示和参数化）以及数值（鲁棒性，准确性和效率）的观点中促进综合水文和生态水文模型的最新技术。这项工作将基于仅少数几个公认的，完全分布的，基于物理的，耦合的水文模型，该模型使用先进的计算算法来解决表面和地下水流和溶质传输的管理质量保护方程。这项工作的主要主题（也将是个别博士学位和博士后研究项目的基础）将包括：各种复杂性的传质和运输现象；将其他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术语；扩展该模型现有的合奏框架，该框架实施了用于数据同化的，以参数估计和灵敏度分析；从田间地块到河流盆地的多个和嵌套尺度上的模型的应用。与异质性，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有关的综合，基于过程的水文建模的挑战。将评估不同状态变量的模型性能，包括集成量度（例如流量和溶质浓度）在排放出口处的溶质和溶质浓度，总系统水存储和溶质质量以及总的地下水充电，以及分布式响应，例如在传感器网络沿不同点的不同点的水分水分，质量浓度和在不同点的交换通量。该项目将依赖于实验性山坡和流域量表研究地点的详细多元观察数据的可用性。这项研究将在国际层面上是高度合作的，并将包括参与多学科现场实验以及模型对比和基准测试研究。研究界对可靠，可扩展的开源代码的需求很高，这些代码可以基于一致和严格的物理（以及化学/生物学），数学和数值原则来解决综合的生态水文过程。拟议的研究将导致改进的模拟模型，以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如何受到人为应力和其他因素影响这些系统的理解。**