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首页> 外文会议>Pan-American conference on unsaturated soils >Comparison of Percolation of Flat and Slope Section Vegetated Lysimeters Using Field Soil Water Characteristic Curve
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Comparison of Percolation of Flat and Slope Section Vegetated Lysimeters Using Field Soil Water Characteristic Curve

机译：利用田间土壤水分特征曲线比较平坦坡面植被测渗仪的渗透率

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Evapotranspiration (ET) cover is an improved cover system over the conventional landfill final soil cover. Hydrologic properties, such as hydraulic conductivity, moisture content, and suction of soil play a significant role to quantify the subsurface water movement in an ET cover system. Understanding the mechanism of unsaturated flow in the vadose zone of an ET cover system is important to effectively quantify the percolation of the ET cover system. Determination of percolation using only field scale lysimeters can be misleading. Therefore, the objective of the current study is to evaluate percolation of the ET cover system using the field soil water characteristic curve (FSWCC). Limited studies have been carried out to relate the ET cover percolation with the field soil water characteristic curve (FSWCC). The study investigates how the in-situ soil suction and moisture is related to the most critical parameter percolation of an ET cover system in both flat and slope section lysimeters. The project site is located at the City of Denton Landfill, in Denton, TX. Moisture sensors along with tensiometers were installed in the flat and slope section lysimeters at different depths in the 1.22 m (48 in.) cover soil. Based on the preliminary analysis, FSWCC was found to have different saturated volumetric moisture content (VMC) at the same meteorological condition. Moreover, the flat section lysimeter was found to reach the saturated condition at lower VMC (average VMC = 0.36) than the VMC (average VMC = 0.44) of slope section lysimeter and eventually flat section lysimeter had higher percolation than the slope section lysimeter.
机译：蒸散（ET）覆盖是对常规垃圾填埋场最终土壤覆盖的一种改进的覆盖系统。水文特性，例如水力传导率，水分含量和土壤吸力，在量化ET覆盖系统中地下水分运动方面起着重要作用。理解ET覆盖系统渗流带中非饱和流动的机理对于有效地定量ET覆盖系统的渗滤非常重要。仅使用场标溶度计确定渗滤可能会产生误导。因此，本研究的目的是利用田间土壤水分特征曲线（FSWCC）评估ET覆盖系统的渗流。为使ET覆盖渗流与田间土壤水分特征曲线（FSWCC）进行了有限的研究。这项研究调查了在平坦和倾斜截面溶渗仪中，原位土壤吸力和水分与ET覆盖系统的最关键参数渗滤如何相关。该项目位于德克萨斯州丹顿市的丹顿垃圾填埋场。水分传感器和张力计分别安装在平坦和倾斜部分的渗漏计中，在1.22 m（48 in。）的覆盖土壤中的不同深度处。根据初步分析，在相同的气象条件下，FSWCC具有不同的饱和体积水分含量（VMC）。此外，发现平板截面溶渗仪在比倾斜截面溶密仪的VMC（平均VMC = 0.44）低的VMC（平均VMC = 0.36）达到饱和条件的情况下，最终平板截面溶渗仪的渗滤度高于斜坡截面溶渗仪。

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