摘要
将溶质运移方程、一维饱和-非饱和土壤水分运动控制方程和Kool-Parker滞后模型联立耦合,建立了地下水位波动条件下土层中硝态氮迁移转化模型。采用有限元数值分析方法,模拟了在地下水位波动条件下硝态氮的迁移过程且与室内土柱实验结果进行对比。结果表明,所建模型的模拟结果与室内土柱实验结果吻合,地下水位波动对硝态氮迁移转化影响显著,其浓度随水位的下降而上升,随浓度的上升而下降。水位波动幅度越大,其浓度波动范围越大。所建数学模型能较好反应硝态氮随水位波动的迁移转化规律。
A model for nitrate nitrogen transport with water table fluctuation in soil was established by coupling the Kool-Parker soil moisture hysteresis model and the governing equations of solute transport and transient flow in saturated-unsaturated soil. Numerical analyses were performed to investigate the effects of water table fluctuation on the nitrate nitrogen transport in soil and groundwater. It was found that the results of the model were consistent with that of soil column. The nitrate nitrogen concentration increased with water table rising while decreased with water table falling. The greater concentration amplitude of nitrate nitrogen was with larger water table fluctuation amplitude.The model for nitrate nitrogen transport with water table fluctuation could be better to reflect the nitrate nitrogen migration.
出处
《土壤通报》
CAS
CSCD
北大核心
2014年第5期1077-1082,共6页
Chinese Journal of Soil Science
基金
国家自然科学基金项目(51208487)资助
关键词
地下水
水位波动
硝态氮
数学模型
迁移转化
Groundwater
Water table fluctuation
Nitrate nitrogen
Numerical model
Migration and transformation
