انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 1 1 2005 08 23 Simulation of Natural and Engineered Hydraulic Trap Systems in a Landfill, Using one- dimensional Three-Layer Laboratory Models شبیه سازی سیستمهای تله هیدرولیکی طبیعی و مهندسی در مدفن زباله با استفاده از مدلهای آزمایشگاهی یک بعدی سه لایه ای 55 68 85364 10.30482/jhyd.2005.85364 FA کاظم بدو بهزاد عیسی زاده Journal Article 2005 03 21 The role of unsaturated drainage layer and hydraulic control systems in sanitary-engineered solid<br />waste landfills were simulated using three-layer one-dimensional laboratory models. In the models,<br />from top to bottom, a sodium chloride solution as a contaminant source reservoir, a first compacted silt<br />layer as a primary liner, a coarse sand layer as a secondary leachate collection system or a hydraulic<br />control layer, a second compacted silt layer as a secondary liner, and a bottom water reservoir as a<br />groundwater aquifer, were used. In the first two tests, the model simulated the secondary leachate<br />collection system and natural hydraulic trap system (upward flow through the second clayey silt<br />layer). In this case, the contaminant transport mechanisms through the first silt layer were downward<br />advection and diffusion, and through the second silt layer, diffusion was downward and advection was<br />upward. The results showed that the implementation of the natural hydraulic control system could<br />effectively reduce the contaminant transport to the underlying groundwater reservoir. In the third test,<br />the natural and engineered hydraulic trap systems were simulated (upward flow from the bottom<br />reservoir to the upper reservoir). In the fourth test, the model simulated the engineered hydraulic trap<br />system (downward flow through the first silt layer and upward flow through the second silt layer). The<br />results showed that natural and engineered hydraulic trap systems have important effects on reducing<br />the contaminant transport toward the underlying aquifer. In all experiments the chloride concentration<br />in silt and coarse sand layers and top and bottom reservoirs were measured and the observed<br />concentrations were compared with theoretical concentrations calculated by computer code POLLUTE<br />V6. The results showed that there is good agreement between theoretical and observed data. https://jhyd.iha.ir/article_85364_58d8e2b3e0c6cef74a997f1b4b5497c7.pdf