Process-based characterization of flow in unsaturated fractured rocks

基于过程的非饱和裂隙岩石流动表征

• 批准号: 251078144
• 负责人: Professor Dr. Martin Sauter
• 金额: --
• 依托单位: Abteilung 9 - Landesamt für Geologie, Rohstoffe und Bergbau
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/251078144?language=en
• 关键词: Process; based; characterization; flow; unsaturated

Simulation of rapid flow through unsaturated fractured rocks is still a challenge because of a number of uncertainties ranging from process understanding, scale effects and characterization of process parameters across scales. Our proposal focuses on the development of a modeling tool for simulation of unsaturated flow on a local scale and the assessment in how far small scale processes affect travel time distribution of water in unsaturated fractured rocks on larger scales. The main objective of model development is the simulation of free-surface flow including the effects of surface tension and contact line dynamics. For this purpose, meshless Smoothed Particle Hydrodynamics (SPH) codes will be developed. To obtain an understanding of flow processes that occur on fracture surfaces, simulations will cover a broad spectrum of flow regimes and interactions ranging from: (1) capillary flow, (2) thin adsorbed films on fracture surfaces, and (3) highly non-linear flow regimes in fractures, e.g. droplet flow. Modeling the complex hydrodynamic interplay between these flow compartments will strongly enhance the understanding of travel time distributions of water through fractured unsaturated rock materials, which cannot be captured with common volume effective continuum modeling approaches such as the Richards equation. The developed particle based flow models will provide a versatile numerical framework to investigate unsaturated flow through various porous materials and fracture geometries associated with consolidated rocks.

通过非饱和裂隙岩石的快速流动的模拟仍然是一个挑战，因为许多不确定性，从过程的理解，尺度效应和跨尺度的过程参数的表征。我们的建议侧重于开发一个模拟工具，用于模拟局部尺度上的非饱和流，并评估小尺度过程在多大程度上影响较大尺度上非饱和裂隙岩石中水的走时分布。模型开发的主要目标是模拟自由表面流，包括表面张力和接触线动力学的影响。为此，将开发无网格光滑粒子流体动力学（SPH）代码。为了了解断裂面上发生的流动过程，模拟将涵盖广泛的流动状态和相互作用，范围包括：（1）毛细流动，（2）断裂面上的薄吸附膜，以及（3）断裂中的高度非线性流动状态，例如液滴流动。模拟这些流动隔间之间的复杂的水动力相互作用将大大提高水通过裂隙非饱和岩石材料的旅行时间分布的理解，这不能被捕获与常见的体积有效连续模拟方法，如理查兹方程。所开发的基于颗粒的流动模型将提供一个通用的数值框架，以调查通过各种多孔材料和与固结岩石相关的裂缝几何形状的非饱和流。