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CRACK‐NP, development of a model for predicting pollutant transport in cracking clay soils
Author(s) -
Matthews A.M.,
Portwood A.M.,
Armstrong A.C.,
LeedsHarrison P.B.,
Harris G.L.,
Catt J.A.,
Addiscott T.M.
Publication year - 2000
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/j.1475-2743.2000.tb00210.x
Subject(s) - macropore , soil water , leaching (pedology) , sorption , cracking , environmental science , soil science , soil structure , lessivage , geotechnical engineering , leaching model , geology , hydrology (agriculture) , chemistry , materials science , adsorption , soil fertility , composite material , mesoporous material , biochemistry , organic chemistry , catalysis
. In cracking clay soils the movement of water and solutes is greatly influenced by the arrangement of cracks and aggregates in the soil profile. It is essential that a model to simulate leaching from clay soils takes into account the routes of water movement and the interaction between water in the macropores and the soil aggregates. This paper describes modification of the CRACK model, which includes an explicit description of the structure of an aggregated clay soil and can simulate the movement of water and solutes, to create CRACK‐NP, which incorporates nitrogen transformations and pesticide sorption and degradation. The application of the model to data from the Brimstone Farm experimental site in Oxfordshire, UK, is described. Results show that the model provides good simulations of both nitrate and pesticide leaching at the site but further testing is required to evaluate its performance over a wider range of hydrological conditions at this and other sites.