SOIL-WATER BEHAVIOR IN A PUSH TERMINAL-MORAINE, COMPARISON OF ONE-DIMENSIONAL AND 2-DIMENSIONAL SIMULATIONS BASED ON INTENSIVE REGIONAL FIELD OBSERVATIONS
A. Pollex et al., SOIL-WATER BEHAVIOR IN A PUSH TERMINAL-MORAINE, COMPARISON OF ONE-DIMENSIONAL AND 2-DIMENSIONAL SIMULATIONS BASED ON INTENSIVE REGIONAL FIELD OBSERVATIONS, Geoderma, 69(3-4), 1996, pp. 249-263
To predict the contamination risk of drinking water in a water catchme
nt, regionalization methods, in which regional transferability is pres
upposed by assigning areas of same qualities, are used. Those methods
use soil information at the field scale to build up soil profiles, whi
ch serve as input for one-dimensional simulation models of water and s
olute transport together with management data. These simulation models
compute groundwater recharge to determine the transport and contamina
tion risk of solutes. The regionalization method assumes horizontal ho
mogeneity and one representative soil profile (principal profile) for
each soil mapping unit. Our objective is to show that those regionaliz
ation methods have to be improved in regions of high spatial variabili
ty of soil qualities. As an example we examine a terminal moraine typi
cal of northern Germany. We combine intensive investigations of the so
il structure, long-time field observations and simulation results to s
how the necessity to improve methods for soil mappings. Our results su
ggest that it is necessary to perform higher-dimensional simulations o
f water and solute transport in regions of high spatial soil structure
variability. Two-dimensional simulations compute earlier and higher g
roundwater recharge rates than one-dimensional simulations.