Non-equilibrium processes during infiltration into structured soil

渗透到结构性土壤过程中的非平衡过程

• 批准号: 77063638
• 负责人: Professor Dr. Hans-Jörg Vogel
• 金额: --
• 依托单位: Department Bodensystemforschung
• 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 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/77063638?language=en
• 关键词: Non; equilibrium; processes; during; infiltration

This project builds up on the key findings during the first period: i) the development of a new experimental approach (Multi-Step-Flux experiment - MSF) to directly measure hydraulic non-equilibrium during transient flow conditions and ii) the recognition that the degree of hydraulic non-equilibrium is rather a gradual feature than threshold like process controlled by structural soil properties and the external forcing. In continuation we focus in the second period on i) the development of an effective 1D modeling approach to include hydraulic non-equilibrium in a model framework based on Richards equation, ii) the estimation of hydraulic heterogeneity which is deemed to be critical for the degree of non-equilibrium and iii) the experimental evaluation of solute transport during transient states of infiltration. As in the first project period, the aim is to improve modeling concepts including hydraulic non-equilibrium and preferential flow while the required parameterizations are based on observable quantities of soil heterogeneity and atmospheric boundary conditions.

该项目基于第一个阶段的主要发现：i）开发了一种新的实验方法（多步 - 升华实验-MSF），以直接测量短暂流动条件下的液压非平衡性，ii）认识到，水力非平衡程度是相当渐进的非平衡特征是一种渐进的特征，而不是threshold诸如threshold诸如threshold诸如thresholders Conture thress ofternal ofternal fy Outertal and Outertal fy Brounderal and from andertoral土壤和外部的土壤。在继续进行的第二阶段中，我们将重点放在i）开发有效的1D建模方法上，以在基于理查兹方程的模型框架中包括液压非平衡，ii）估计液压异质性的估计，这被认为对非平衡性的程度至关重要，对于非平衡性和III的程度至关重要。与第一个项目时期一样，目的是改善建模概念，包括液压非平衡和优先流动，而所需的参数化基于可观察到的土壤异质性和大气边界条件的可观察量。

项目成果

Conductivity and Hydraulic Nonequilibrium across Drainage and Infiltration Fronts

排水和渗透前沿的电导率和水力不平衡

• DOI: 10.2136/vzj2011.0134
• 发表时间: 2012
• 期刊: Vadose Zone Journal
• 影响因子: 2.8
• 作者: Weller