农药在包气带中迁移过程的数值模拟  

Numerical Modeling of Pesticides Transport in Vadose Zone

作　　者：汤亚飞[1] 王焰新[2] 蔡鹤生[2] 

机构地区：[1]武汉化工学院,武汉430074 [2]中国地质大学环境学院,武汉430074

出　　处：《安全与环境工程》2005年第2期11-14,共4页Safety and Environmental Engineering

基　　金：国家自然科学基金重点资助项目(49832005);教育部优秀青年教师教学科研奖励计划资助项目;湖北省科技攻关计划资助项目

摘　　要：根据水动力学弥散理论建立农药在包气带中运移与转化过程的数学模型,评价农药使用对地下水环境的影响。选择应用范围广、用量大、毒性高的7种农药为目标污染物,以汉江流域的中下游地区的气象与土壤特征为条件进行模拟,结果表明,甲胺磷、乐果、甲草胺容易在土壤中淋溶,对地下水造成很大威胁。根据地下水埋深和设定的浓度限值,估算了农药对地下水的安全使用量。A mathematic equation was established to model the leaching and transformation of pesticides in root zone and assess impact of pesticide on groundwater. 7 widely and largely used pesticides with high toxicity were chosen as target pollutants. According to the meteorology and soil property at the middle-lower reaches of Hanjiang River catchment, modeling results showed that methamidophos, dimethoate and alachlor could easily leach through soil and constitute risk to the groundwater. Safe dosages were estimated at a certain groundwater depth and a supposed pesticide concentration standard.

关 键 词：汉江流域 农药 地下水污染 数值模拟 

分 类 号：X523[环境科学与工程—环境工程]