C. Alewell et al., DESCRIBING SOIL SO42- DYNAMICS IN THE SOLLING ROOF PROJECT WITH 4 2 DIFFERENT MODELING APPROACHES, Water, air and soil pollution, 85(3), 1995, pp. 1801-1806
The release of previously stored soil SO42- is tightly connected with
the reversibility of soil and water acidification. Thus soil SO42- dyn
amics have to be included when predicting the reversibility acidificat
ion. Our aim was to compare two modelling approaches: The model MAGIC
(Cosby ct at, 1985) describes SO42- dynamics with the Langmuir sorptio
n isotherme. In the SO-MODEL (Prenzel, 1991) a precipitation/dissoluti
on of jurbanite is defined. Even though it was possible to calibrate b
oth models to lysimeter data of the Selling D1 site in 1 m depth, the
prognosis for SO42- concentrations in the soil solution differed signi
ficantly. While MAGIC predicted the observed gradual decrease of SO42-
concentration with decreasing deposition, the SO-MODEL calculated sta
ble concentrations up to the year 2026 followed by a sudden drop. Beca
use the prognosis established with the SO-MODEL is incompatible with o
bserved field data, we concluded that the predicted SO42- dynamic of t
he SO-MODEL was unrealistic.