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Models for hydrologic design of evapotranspiration landfill covers

机译：蒸散填埋场水文设计模型

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摘要

The technology used in landfill covers is changing, and an alternative cover called the evapotranspiration (ET) landfill cover is coming into use. Important design requirements are prescribed by Federal rules and regulations for conventional landfill covers but not for ET landfill covers. There is no accepted hydrologic model for ET landfill cover design. This paper describes ET cover requirements and design issues, and assesses the accuracy of the EPIC and HELP hydrologic models when used for hydrologic design of ET covers. We tested the models against high-quality field measurements available from lysimeters maintained by the Agricultural Research Service of the U.S. Department of Agriculture at Coshocton, Ohio, and Bushland, Texas. The HELP model produced substantial errors in estimating hydrologic variables. The EPIC model estimated ET and deep percolation with errors less than 7% and 5%, respectively, and accurately matched extreme events with an error of less than 2% of precipitation. The EPIC model is suitable for use in hydrologic design of ET landfill covers.
机译：垃圾掩埋场中使用的技术正在发生变化，一种称为蒸散（ET）垃圾掩埋场的替代掩盖正在使用。联邦法规对常规的垃圾掩埋场规定了重要的设计要求，而对于ET垃圾掩埋场则没有规定。 ET垃圾掩埋场设计没有公认的水文模型。本文介绍了ET覆盖层的要求和设计问题，并评估了EPIC和HELP水文模型用于ET覆盖层的水文设计时的准确性。我们对照美国农业部农业研究服务局（美国农业部）在俄亥俄州科肖克顿和得克萨斯州布什兰市维护的溶渗仪进行的高质量现场测量对模型进行了测试。 HELP模型在估算水文变量方面产生了重大错误。 EPIC模型估计的ET和深层渗流的误差分别小于7％和5％，并精确匹配极端事件，且误差小于降水的2％。 EPIC模型适用于ET垃圾掩埋场的水文设计。

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