Intermediate Dynamic Model for Metals (IDMM), including Agricultural version (IDMM-ag)
The IDMM family of models predict concentrations of metals in soil and drainage water resulting from inputs over long timescales (decades and longer). They are used for environmental risk assessment: specifically to assess pollution risk from metals.
IDMM is a dynamic process model that uses simple representations of metal chemistry in soils (sorption and fixation) to predict metal concentrations in soil solids and porewater, plus leaching losses, on an annual timestep. It can be run for point locations or on a spatial grid for wider areas. The IDMM-ag version is adapted for risk assessment of metals in small agricultural catchments; it includes an additional module to predict the fate of dissolved metals in surface water.
IDMM was originally developed by Ed Tipping in 2004 using Defra funding. The IDMM-ag version was developed by Stephen Lofts from 2012 with funding from the copper and zinc industry. Wider spatial capability was developed by Sam Harrison from 2018 using NERC National Capability funding.
IDMM is an openly available soil mass-balance model that is used for large-scale prediction of changes in soil metal concentrations over time; other models with capabilities and similar data requirements are less openly available.
IDMM models were developed by UKCEH.
IDMM is an expert system requiring specialist knowledge. It is available to use with UKCEH training and advice, by request to the model owner. No cost?
Development of IDMM was funded by: Defra; International Copper Association; International Zinc Association; and UKRI-NERC National Capability (UK-SCAPE programme: SPEED project).
IDMM is used by UKCEH researchers to develop metal risk assessment dossiers for industry and regulators.