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FOR 1083: Multi-Scale Interfaces in Unsaturated Soil (MUSIS)

FOR 1083：非饱和土中的多尺度界面（MUSIS）

基本信息

批准号：
66234063
负责人：
金额：
--
依托单位：
Institut für Strömungsmechanik und Umweltphysik im Bauwesen
依托单位国家：
德国
项目类别：
Research Units
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/66234063?language=en
关键词：
1083 Multi Scale Interfaces Unsaturated

项目摘要

Water distribution and dynamics within the unsaturated zone determine energy balance and key mass fluxes at the land-atmosphere interface at scales ranging from soil profile to continental response. Soil water redistribution and exchanges such as infiltration and evaporation at the interface with the atmospheric boundary layer above, or drainage and recharge with groundwater below often involve displacement of fluid fronts across soil layers and through heterogeneous boundaries. Current modelling concepts are inadequate for describing such complex displacement processes through naturally-heterogeneous soils with highly non-linear flow mechanisms involved, thus limiting their predictive capabilities simply because water-air interfaces may form a stable displacement front or may split into fingers and preferential flow domains, leading to vastly different patterns of water distribution and associated transport pathways. The central working hypothesis is that small-scale physics of moving water-air interfaces within heterogeneous soil structures and interplay among competing driving forces give rise to a wide array of macroscopic patterns of water and gas dynamics not captured by standard continuum models. The primary objective of this Research Unit is to characterise and quantify characteristic patterns of water and gas distributions as a function of

非饱和区内的水分布和动态决定了从土壤剖面到大陆响应的尺度上陆地-大气界面处的能量平衡和关键质量通量。土壤水的重新分配和交换，例如与上方大气边界层界面处的渗透和蒸发，或下方地下水的排水和补给，通常涉及流体前沿跨土层和非均质边界的位移。当前的建模概念不足以描述通过涉及高度非线性流动机制的自然非均质土壤的这种复杂的位移过程，因此限制了它们的预测能力，因为水-空气界面可能形成稳定的位移前沿，或者可能分裂成指状和优先流动域，导致水分布和相关传输路径的模式截然不同。核心工作假设是，异质土壤结构内移动的水-空气界面的小尺度物理以及竞争驱动力之间的相互作用产生了标准连续介质模型无法捕捉到的各种水和气体动力学的宏观模式。该研究单位的主要目标是表征和量化水和气体分布的特征模式作为函数