COLLABORATIVE RESEARCH: Evaluating Long-Term Impacts on Final Covers -- Exhumation of the ACAP Test Sections

合作研究：评估对最终封面的长期影响——ACAP 测试部分的挖掘

• 批准号: 0625850
• 负责人: Craig Benson
• 金额: --
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-15 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0625850&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Evaluating; Long; Term

Abstract The objective of this study is to evaluate the effects of pedogenesis on the properties of soils and geosynthetics in landfill final covers and the mechanisms that control pedogenic changes. This objective will be met by conducting physical experiments while exhuming large-scale test sections simulating final covers that were constructed in 1999-2000 for the Alternative Cover Assessment Program (ACAP). Field hydraulic conductivity tests will be conducted on each test section to identify the magnitude and variability in saturated hydraulic conductivity, and dye and salt tracer tests will be conducted to assess preferential flow. Data from these tests will be analyzed with a variably saturated flow and transport model that accounts for coupling between the matrix and preferential flow paths, and using data collected regarding state variables (matric suction, water content, temperature, etc.). Large block samples will be removed from each test section at various locations and depths and tested to evaluate how the hydraulic properties vary spatially and with scale. Geomorphic mapping will be conducted to provide quantitative information on soil structure that can be used to interpret the magnitude and scale-dependence of changes in hydraulic properties. Vegetation surveys will be conducted to evaluate transitions in species distribution, rooting depth and density, and other characteristics affecting transpiration, and to assess whether transitions are coupled to pedogenesis. The results will be used to identify physical, hydrological, and biological mechanisms that affect cover performance and to provide insight into how covers change over time. The lessons learned will be used to improve cover design and construction and for assessments of long-term performance. The findings will also apply to other hydrologic problems (e.g., natural recharge, urban watershed hydrology, infiltration and runoff in engineered landscapes). Additional broader impacts will be obtained by enhanced student learning via inter-disciplinary and inter-institutional collaboration, development of a hydrology module for a middle school environmental science curriculum, and by recruiting diversity students to the project.

摘要这项研究的目的是评估垃圾填埋最终覆盖物中土壤和土工合成剂的特性的影响，以及控制成虫变化的机制。该目标将通过进行物理实验来实现，同时挖掘出模拟1999 - 2000年为替代覆盖评估计划（ACAP）构建的最终覆盖的大规模测试部分。将在每个测试部分进行场水力电导率测试，以确定饱和水力电导率的大小和变异性，并将进行染料和盐示踪剂测试以评估优先流动。这些测试的数据将通过可变的饱和流和传输模型进行分析，该模型是矩阵和优先流动路径之间耦合的，并使用有关状态变量（矩阵吸力，水含量，温度等）收集的数据。将从每个位置和深度的每个测试部分中删除大块样品，并进行了测试，以评估液压特性如何在空间上和比例尺变化。将进行地貌映射，以提供有关土壤结构的定量信息，该信息可用于解释液压特性变化的幅度和规模依赖性。将进行植被调查，以评估物种分布，生根深度和密度以及影响蒸腾的其他特征的过渡，并评估过渡是否耦合到伪造。结果将用于识别影响覆盖性能的物理，水文和生物学机制，并洞悉覆盖时间随时间变化的变化。所学的教训将用于改善覆盖设计和构建以及评估长期绩效。这些发现还将适用于其他水文问题（例如，自然补给，城市流域水文学，工程景观中的浸润和径流）。通过跨学科和机构间合作，为中学环境科学课程开发水文学模块，以及通过招募多样性学生参加该项目，可以通过增强学生学习，从而获得更广泛的影响。