Bird Sandra L, Perry Stèven G, Ray Scott L, Teske Milton E
Ecosystems Research Division, National Exposure Research Laboratory, US Environmental Protection Agency, Athens, Georgia 30605, USA.
Environ Toxicol Chem. 2002 Mar;21(3):672-81. doi: 10.1897/1551-5028(2002)021<0672:eotaas>2.0.co;2.
A systematic evaluation of the AgDISP algorithms, which simulate off-site drift and deposition of aerially applied pesticides, contained in the AgDRIFT model was performed by comparing model simulations to field-trial data collected by the Spray Drift Task Force. Field-trial data used for model evaluation included 161 separate trials of typical agriculture aerial applications under a wide range of application and meteorological conditions. Input for model simulations included information on the aircraft and spray equipment, spray material, meteorology, and site geometry. The model input datasets were generated independently of the field deposition results, i.e., model inputs were in no way altered or selected to improve the fit of model output to field results. AgDRIFT shows a response similar to that of the field observations for many application variables (e.g., droplet size, application height, wind speed). However, AgDRIFT is sensitive to evaporative effects, and modeled deposition in the far-field responds to wet bulb depression whereas the field observations did not. The model tended to overpredict deposition rates relative to the field data for far-field distances, particularly under evaporative conditions. AgDRIFT was in good agreement with field results for estimating near-field buffer zones needed to manage human, crop, livestock, and ecological exposure.
通过将模型模拟结果与喷雾漂移特别工作组收集的田间试验数据进行比较，对AgDRIFT模型中包含的用于模拟空中喷洒农药场外漂移和沉积的AgDISP算法进行了系统评估。用于模型评估的田间试验数据包括在广泛的应用和气象条件下对典型农业空中喷洒进行的161次独立试验。模型模拟的输入包括有关飞机和喷雾设备、喷雾材料、气象和场地几何形状的信息。模型输入数据集的生成与田间沉积结果无关，即模型输入绝不会为了提高模型输出与田间结果的拟合度而被更改或选择。对于许多应用变量（如液滴大小、喷洒高度、风速），AgDRIFT显示出与田间观测结果相似的响应。然而，AgDRIFT对蒸发效应敏感，远场模拟沉积对湿球温度下降有响应，而田间观测结果则没有。相对于远场距离的田间数据，该模型往往高估沉积速率，特别是在蒸发条件下。在估计管理人类、作物、牲畜和生态接触所需的近场缓冲区方面，AgDRIFT与田间结果高度一致。
