裂隙粘土中MACRO和CRACK-NP模型的比较

Comparison of MACRO and CRACK-NP models in a cracking clay soil:

为了比较两种裂隙粘土中杀虫剂运移模型:MACRO模型和CRACK-NP模型,引用了英国Brimstone农场的裂隙粘土中杀虫剂运移的数据。模型模拟了两个时间段杀虫剂的运移,即整个冬季的每天和20天内每小时的运移。虽然CRACK-NP模型模拟的结果与引用数据较吻合,但MACRO模型模拟的效果要比CRACK-NP模型更好。在这个试验数据中,虽然可以得到许多的水文学数据(地下水位、排水和地表水流),但是土壤和排水中的杀虫剂浓度的数据比较缺乏,这使得这两个模型只能预测杀虫剂主要的运移时间和量。

Two pesticide-leaching models: MACRO and CRACK-NP are described.For the comparison of the two models,the data of the leaching of the pesticide isoproturon from the macroporous clay soil at Brimstone Farm are cited.Model results are presented for two test periods,the whole of one winter for which daily modeling values are available,and a short subset for which hourly data are presented.The better results are those given by MACRO,although satisfactory results are also obtained from CRACK-NP.From this site,many observations of site hydrology(water table position,drain flow and surface flow) are available,but significantly,fewer pesticide concentrations in either the soil or the discharges are available.Models could thus be evaluated only in terms of their ability to predict the magnitude and timing of major pesticide leaching events.