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Effective contaminant source geometries and their implications for final plume extension - ESTIMATE

有效的污染物源几何形状及其对最终羽流延伸的影响 - 估计

基本信息

批准号：
383453752
负责人：
Professor Dr. Peter Dietrich
金额：
--
依托单位：
Department of Civil, Architectural and Environmental Engineering
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/383453752?language=en
关键词：
Effective contaminant source geometries their

项目摘要

Dense non-aqueous phase liquid (DNAPL) contaminants have been found to persist in groundwater bodies for several decades due to their very low solubility in water as well as biodegradation properties. A proper risk assessment of each contaminant site is required as DNAPLs additionally pose a tremendous environmental and health hazard.Up to now, numerous investigations (field studies, laboratory experiments, analytical and numerical modelling) were carried out in order to characterise sub-surface contaminant migration, transport within plumes, and governing reactive processes. Source zone architecture is found to have significant influence on steady-state plume extension, which is the critical assessment property. However, the relevance of different impacts (i.e. aquifer properties, external stresses) with respect to the final state of a source zone could not sufficiently be clarified and quantified. Hence, more information on geometric measures of a contaminant source and its major dependency on impacts are required. Complex source geometries are valid for a single scenario only, and depend on a large number of processes. However, in analytical or numerical analyses, source geometry is mostly incorporated very rudimentarily as simple geometrical structures due to time and data limitations. Therefore, straightforward effective source geometries that condense information, and emerge from sub-surface properties and external stresses are required for an improved prediction of contaminant plumes. Effective source geometries could be used to predict final plume lengths with same accuracy as complex source geometries. We consider this as the currently most critical knowledge gap that restricts our ability to adequately predict contaminant plume lengths. Therefore, we want to characterise the influence of aquifer properties and external stresses on DNAPL source zone architecture which will allow us to derive transformation techniques to convert complex to effective source geometries under consideration of impacts. To achieve this, we will utilize a combination of laboratory-scale experiments, and numerical modelling. Our main research challenges are to (i) enhance the understanding of the final extent of complex DNAPL source zone architectures, (ii) quantify the influence of external stresses and site-specific characteristics on the final extent of complex source zones, (iii) derive effective source geometries from complex source geometries, and (iv) provide a functional relationship of external stresses and site-specific characteristics to acquire effective source geometries for the use in analytical or numerical assessment tools. Based on a combination of a plume length model and a source characterisation model, we hypothesise that improved description of source geometries will yield better estimations of maximum plume length and, therefore, much better opportunities for DNAPL remediation techniques.

重非水相液体（DNAPL）污染物由于其在水中的低溶解度和可生物降解性，已被发现在地下水体中持续存在几十年。一个适当的风险评估，每个污染物的网站是必要的，因为DNAPLs另外构成了巨大的环境和健康hazards.To到现在为止，进行了大量的调查（现场研究，实验室实验，分析和数值模拟），以确定次表面污染物迁移，羽流内的运输，和管理的反应过程。源区结构被发现有显着的影响，稳态羽状延伸，这是关键的评估属性。然而，不同影响（即含水层特性、外部应力）与源区最终状态的相关性无法得到充分澄清和量化。因此，需要更多关于污染源的几何计量及其对影响的主要依赖性的信息。复杂的源几何形状仅适用于单个场景，并且取决于大量的过程。然而，在解析或数值分析中，由于时间和数据的限制，震源几何形状大多是非常原始地作为简单的几何结构来包含的。因此，直接有效的源的几何形状，浓缩的信息，并出现从次表面的属性和外部应力是需要改进的预测污染物羽流。有效的源的几何形状可以用来预测最终的羽流长度与复杂的源的几何形状相同的精度。我们认为这是目前最关键的知识差距，限制了我们的能力，充分预测污染物羽流长度。因此，我们要考虑DNAPL源区结构的含水层属性和外部应力的影响，这将使我们能够推导出转换技术，将复杂的有效源几何形状的影响下。为了实现这一目标，我们将利用实验室规模的实验和数值模拟相结合。我们的主要研究挑战是（i）提高对复杂DNAPL源区结构最终范围的理解，（ii）量化外部应力和场地特定特征对复杂源区最终范围的影响，（iii）从复杂源区几何形状中推导出有效的源区几何形状，以及（iv）提供外部应力和特定场地特性的函数关系，以获得用于分析或数值评估工具的有效源几何形状。基于羽流长度模型和源表征模型的组合，我们假设，改进的描述源的几何形状将产生更好的估计最大羽流长度，因此，更好的机会DNAPL修复技术。