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首页> 外文会议>Waste management 2002 symposium (WM'02 conference): HLW, LLW, mixed, hazardous wastes and environmental restoration - working towards a cleaner environment >THE FUTURE THROUGH THE PAST: THE USE OF ANALOG SITES FOR DESIGN CRITERIA AND LONG-TERM PERFORMANCE ASSESSMENT OF EVAPOTRANSPIRATION LANDFILL COVERS
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THE FUTURE THROUGH THE PAST: THE USE OF ANALOG SITES FOR DESIGN CRITERIA AND LONG-TERM PERFORMANCE ASSESSMENT OF EVAPOTRANSPIRATION LANDFILL COVERS

机译：过去的未来：使用模拟站点进行蒸发蒸腾填埋场设计准则和长期性能评估

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There is growing support for using evapotranspiration (ET) covers for closure of low-level wastern(LLW) and other types of waste disposal sites, particularly in the lower latitude arid regions ofrnthe western United States. At the Nevada Test Site (NTS), monolayer ET covers are the baselinerntechnology for closure of LLW and mixed LLW cells. To better predict the long-termrnperformance of monolayer ET covers, as well as to identify design criteria that will potentiallyrnimprove their performance, the properties of, and processes occurring on, analog sites for ETrncovers on the NTS are being studied. The project is funded through the SubsurfacernContaminants Focus Area of the U.S. Department of Energy.rnFour analog sites on the NTS have been selected to predict performance of ET covers over arn1,000-year compliance period. Two sites are relatively recently disturbed (within the last 50rnyears) and have been selected to evaluate processes and changes on ET covers for the earlyrnperiod after active cover maintenance is discontinued. Two other sites, late to mid-Holocene inrnage, are intended as analogs for the end of the compliance period (1,000 years or more); bothrnsurfaces are abandoned alluvial/colluvial deposits. The history of the early post-institutionalrncontrol analog sites are being evaluated by an archeologist to help determine when the sites werernlast disturbed or modified, and the mode of disturbance to help set baseline conditions. Similarrnto other “landforms,” ET covers will evolve over time because of pedogenic, biotic, and climaticrnprocesses. Properties of analog sites that could affect ET water balance performance will bernevaluated to help understand ET cover performance over time.rnResults of analog site work and resultant modifications to design, monitoring, and maintenancernof ET covers on the NTS will be compared with results of a similar study being conducted atrnSandia National Laboratories (SNL), where ET cover closures are planned as well. Therncomparison will help to distinguish potential regional differences needed in ET cover design.rnAlthough both sites are at similar latitudes, the NTS is located in a transition zone between thernMojave and southern Great Basin deserts, whereas SNL is located in the northern Chihuahuanrndesert. Differences in vegetation and seasonality of precipitation between the sites arernsignificant.
机译：人们越来越多地支持使用蒸发蒸腾（ET）覆盖层来关闭低层废水（LLW）和其他类型的废物处置场，特别是在美国西部的低纬度干旱地区。在内华达州测试站点（NTS），单层ET覆盖物是封闭LLW和混合LLW细胞的基线技术。为了更好地预测单层ET覆盖层的长期性能，并确定可能改善其性能的设计标准，正在研究NTS上ETrncovers的模拟位点的性质和过程。该项目由美国能源部的SubsurfacernContaminants Focus Area资助.rns NTS上的四个模拟站点已被选中，以预测ET覆盖超过arn1,000年的绩效。最近有两个地点（最近50年来）受到了干扰，因此已经选择了这两个地点，以评估在不进行主动覆盖维护之后，早期的ET覆盖过程和变化。全新世晚期至中期的另外两个地点拟用作法规遵从期结束（1000年或更长）的类似物；两个表面都是废弃的冲积/冲积沉积物。考古学家正在评估机构后早期控制类似场所的历史，以帮助确定这些场所何时被最后一次扰动或修改，以及扰动的模式以帮助设定基线条件。与其他“地貌”相似，ET的覆盖范围会随着成岩，生物和气候过程的发展而逐渐发展。将对可能影响ET水平衡性能的模拟场所的属性进行重新评估，以帮助您了解ET覆盖层随时间的变化.rn将模拟场工作的结果以及对NTS ET覆盖层的设计，监控和维护进行的修改与类似的结果进行比较这项研究是在Sandia国家实验室（SNL）进行的，该实验室还计划关闭ET盖。比较结果将有助于区分ET覆盖设计所需的潜在区域差异。尽管两个站点都位于相似的纬度，但是NTS位于莫哈韦沙漠和大盆地南部的过渡带，而SNL位于奇瓦瓦恩沙漠的北部。两个地点之间的植被和降水的季节性差异不明显。

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