西安理工大学学报2017，Vol.33Issue(4)：419-424,6.DOI:10.19322/j.cnki.issn.1006-4710.2017.04.008
非饱和土壤水动力弥散系数研究
Study of hydrodynamic dispersion coefficient in unsaturated soil
摘要
Abstract
Molecular diffusion and mechanical dispersion have a different impact on soil solute transport in unsaturated soil for the different soil textures.In this paper,we take the loam soil as research goal,with the solute concentration simulated using three calculating formulae of hydrodynamic dispersion coefficient (molecular diffusion,mechanical dispersion and both the effect of them).An optimization mathematical model for the parameter identification of the solute transport parameter is established to minimize the mean square error both of soil water content and Br-concentration between measured and calculated values.The optimization mathematical model is solved by a genetic algorithm.Those parameters are taken to the optimized solute transport equation,with Br-concentration at 1 345 min minutes obtained.The results show that the joint action of diffusion and dispersion has the greatest influence on the correlation coefficient between calculation values and the measured values of Br-concentration,diffusion effect less,and the least dispersion action.The correlation coefficients of which are 0.949,0.916 and 0.793.Both the molecular diffusion and the mechanical dispersion action have an influence on the numerical simulation modulated precision for solute transport in unsaturated soils.关键词
溶质运移/水动力弥散系数/数值模拟/遗传算法Key words
solute transport/hydrodynamic dispersion coefficient/numerical simulation/genetic algorithm分类
农业科技引用本文复制引用
任长江,白丹,何凡,赵新宇,裴青宝,庞博..非饱和土壤水动力弥散系数研究[J].西安理工大学学报,2017,33(4):419-424,6.基金项目
国家自然科学基金资助项目(41571222) （41571222）
江西省科技厅资助项目(20151BBF60012) （20151BBF60012）
