摘要
依据地中渗透计出流口处观测的硝态氮通量平均浓度动态 ,建立土壤硝态氮迁移时间的概率密度函数 ,由随机 -对流假设 ,得出某一时刻土壤剖面不同埋深处硝态氮迁移距离的驻留概率密度函数 ,以其作为响应函数构造对流对数正态传递函数模型 ,仿真拟稳定流条件下田间土壤剖面硝态氮的驻留浓度分布 .经与实测资料对比 。
The flux\|averaged concentration of nitrate\|nitrogen at the reference depth is obtained from the experimental data monitored by non\|weighting lysimeters.The probability density functions of nitrate\|nitrogen travel time are deduced.Based on the stochastic\|convective assumption,the resident probability density functions(PDFS) for nitrate\|nitrogen with depth are derived from the flux PDFS and then the convective lognormal transfer function model (CLT) can be established.The initial value problem of stachastic\|convective model is solved.The validity of the model is verified by the experimental data.
出处
《水利学报》
EI
CSCD
北大核心
2002年第2期54-60,共7页
Journal of Hydraulic Engineering
基金
国家重点基础研究发展规划项目 (G19990 1180 3)
北京市自然科学基金重大项目 ( 6 980 0 0 1)
黄土高原土壤侵蚀与旱地农业国家重点实验室基金课题
关键词
土壤
硝态氮
驻留浓度
传递函数
随机-对流模型
soil
nitrate\|nitrogen
resident concentration
transfer function
stochastic\|convective model
initial value problem
