摘要
本文以实验室内所开展的滴灌施用除草剂———阿特拉津在土壤中运移的物理模拟实验为基础,运用所求得的供试土壤的水力学参数和溶质运移参数及阿特拉津在该土壤中的吸附特性参数和降解速率常数,应用数值模拟软件HYDRUS 2D ,对物理模拟的实验结果进行了仿真,并就不同初始含水量、不同滴头流量对土壤水分和阿特拉津动态分布的影响进行了数值分析,结果表明:随着初始含水量的增加,土壤水分的湿润范围增大,而阿特拉津的分布范围基本不变;当滴灌施药历时相同、滴头流量不同时,随着滴头流量的增加。
Based on the physical modeling of atrazine transport in soil under trickle chemigation HYDRUS|2D software was applied to simulate the moisture movement and atrazine transport in soil.All parameters obtained from physical model were adopted for numerical simulation.The mathematical model considered unsaturated,non_steady flow in a sandy loam,and adsorptive and degradable herbicide is taken into account.According to the observed data obtained from a trickle chemigation device with fan|shaped soil box,the numerical model was verified.And then,the numerical model was used to analyz the effects of different initial water contents and different application rates on the spatial distribution of moisture and atrazine in soil.The results show that(i) with the increase of the initial moisture content the volume of the wetted soil also increase,but the volume of atrazine transport remains almost constant;(ii) under the same application time but different application rates,with the increase of application rate both the volume of wetted soil and the volum of atrazine transported increase.
出处
《水利学报》
EI
CSCD
北大核心
2005年第6期746-753,共8页
Journal of Hydraulic Engineering
基金
国家自然科学基金项目 (4 0 2 710 5 8)
关键词
滴灌
土壤水分
阿特拉津
运移
吸附
降解
数值模拟
trickle irrigation
soil moisture
atrazine
transport
adsorption
degradation
numerical simulation
