Attenuation Factor model results for Upper Floridan aquifer vulnerability to Bromacil and Ethylene Dibromide

This dataset includes Attenuation Factor (AF; Rao and others, 1985) model results for Upper Floridan aquifer vulnerability to Bromacil and 1,2-Dibromoethane or Ethylene Dibromide (EDB). The AF value serves as an index for assessing the transport of pesticide mass from the vadose zone. The AF model setup requires the input of raster soil bulk density, soil organic carbon content, soil field capacity, soil air filled porosity, recharge to the aquifer, depth to groundwater, the pesticide sorption coefficient, pesticide Henry's Law Constant, and pesticide half-life. These variables were entered into the AF equation using the raster calculator tool in ArcGIS. The resulting AF values are dimensionless and range between 0 and 1. A value of 1 indicates that all of the pesticides in the vadose zone will leach into the groundwater; conversely, a value of 0 suggests that no pesticides will leach into the groundwater.

本数据集包含上佛罗里达含水层（Upper Floridan aquifer）对溴谷隆（Bromacil）与1,2-二溴乙烷（Ethylene Dibromide，简称EDB，又名1,2-Dibromoethane）的污染脆弱性评估所用的衰减因子（Attenuation Factor, AF；Rao等，1985）模型结果。AF值是表征农药在包气带（vadose zone）中质量运移情况的评估指标。构建AF模型需输入以下栅格化参数：土壤容重、土壤有机碳含量、田间持水量、土壤充气孔隙度、含水层补给量、地下水埋深、农药吸附系数、农药亨利定律常数以及农药半衰期。上述变量通过ArcGIS软件中的栅格计算器工具代入AF计算公式。最终生成的AF值为无量纲数值，取值区间介于0至1之间：当AF值为1时，代表包气带内的全部农药均可淋滤进入地下水；反之，AF值为0则表明无农药能够淋滤至地下水中。