Merged with duplicate record 10026.1/1270 on 08.03.2017 by CS (TIS)Flow through soil into groundwater has been classically conceptualised as taking place
through a set of aligned capillary tubes. In solute transport models these approximations are
also present. Pore-Cor (a network model) has been used to model the void structure of soil
by using water retention and mercury porosimetry curves. The model successfully predicts
trends in saturated hydraulic conductivity.
The effect of the assumptions used in the Pore-Cor geometry have been investigated by
comparing of two dimensional slices of the simulated networks with two dimensional image
analysis data. The geometric limitations of the model cause packing inefficiencies which
prevent the model from representing the size distribution of voids found in real samples.
The observation of environmental events is dependent upon the implementation of rapid
and reliable analytical techniques. This work presents an adaptation of an FI method for the
determination of dissolved reactive phosphorus (DRP) and a new method for the
determination of total dissolved phosphorus (TDP). Both are ideally suited to the detection
of phosphorus species in soil leachate and runoff waters over the concentration range 3 to
1000 ng 1-1.
The effect of compaction on solute transport is described and the experimental data have
been modelled using a modified form of the convection dispersion equation (CDE). The
parameters of the CDE have been given structural interpretation by the network model. The
model was used to interpret a change in dispersivity and the behaviour of reactive
phosphorus species on compaction.The Institute of Grassland and Environmental Research,
North Wyke, Devo
