Department of Civil and Coastal Engineering, University of Florida, Gainesville, FL, USA.
Ground Water. 2010 May-Jun;48(3):427-37. doi: 10.1111/j.1745-6584.2009.00661.x. Epub 2009 Dec 16.
Permeable reactive barriers (PRBs) are a popular technology for passive contaminant remediation in aquifers through installation of reactive materials in the pathway of a plume. Of fundamental importance are the degree of remediation inside the reactor (residence time) and the portion of groundwater intercepted by a PRB (capture width). Based on a two-dimensional conformal mapping approach (previously used in related work), the latter is studied in the present work for drain-and-gate (DG) PRBs, which may possess a collector and a distributor drain ("full" configuration) or a collector drain only ("simple" configuration). Inherent assumptions are a homogeneous unbounded aquifer with a uniform far field, in which highly permeable drains establish constant head boundaries. Solutions for aquifer flow fields in terms of the complex potential are derived, illustrated, and analyzed for doubly symmetric DG configurations and arbitrary reactor hydraulic resistance as well as ambient groundwater flow direction. A series of practitioner-friendly charts for capture width is given to assist in PRB design and optimization without requiring complex mathematics. DG PRBs are identified as more susceptible to flow divergence around the reactor than configurations using impermeable side structures (e.g., funnel-and-gate), and deployment of impermeable walls on drains is seen to mitigate this problem under certain circumstances.
可渗透反应屏障（PRB）是一种在含水层中通过在羽流路径中安装反应材料来进行被动污染物修复的流行技术。基本的重要因素是反应器内的修复程度（停留时间）和被 PRB 拦截的地下水部分（捕获宽度）。基于二维共形映射方法（先前在相关工作中使用），本研究对排水门（DG）PRB 的后者进行了研究，DGPRB 可以具有集水管和分配管排水（“完整”配置）或仅具有集水管排水（“简单”配置）。假设为具有均匀远场的均质无限含水层，其中高渗透性排水系统建立恒定水头边界。导出、说明并分析了具有双重对称 DG 配置和任意反应器水力阻力以及环境地下水流动方向的含水层流场的复势解。还提供了一系列便于从业者使用的捕获宽度图表，以在不要求复杂数学的情况下帮助 PRB 设计和优化。与使用不透水侧结构（例如，漏斗门）的配置相比，DGPRB 被认为更容易受到反应器周围的水流发散的影响，并且在某些情况下，在排水系统上部署不透水壁可以减轻此问题。
