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Modelling Multi‐Ion Transport in Saturated Soil and Parameter Estimation. I: Theory
Author(s) -
Wenlin Chen,
Yunzhu Li,
Van Ploeg Rienk R. Der
Publication year - 1990
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19901530306
Subject(s) - dissolution , adsorption , precipitation , ion exchange , ionic bonding , chemistry , thermodynamics , displacement (psychology) , flow (mathematics) , sulfate , partial differential equation , ion , mathematics , mineralogy , mathematical analysis , physics , geometry , meteorology , psychology , psychotherapist , organic chemistry
A coupled convective‐dispersive model was developed to describe the solute movement of four ionic species (Ca 2+ , Na + , SC 4 2 and CI) through soil. The model considers precipitation and dissolution of calcium sulfate as well as cation exchange or adsorption during steady‐state water flow in saturated soil columns. With the model hypothetical miscible displacement experiments were carried out. The governing partial differential equations were solved numerically with an implicit Crank‐Nicolson scheme. With the use of obtained results the effect of various model parameters on the shape of the calculated breakthrough curves was investigated. It was found that the processes of dissolution and precipitation, cation exchange or adsorption do have a definite influence on the shape of the breakthrough curves.