{"access":"OPRAS is open access: available to use at no cost by request to the model owner.","capabilities":"OPRAS is a dynamic process model that predicts the formation and loss of soil organic matter, pores and water-holding capacity in soils across the mineral - organomineral - peat continuum.  It integrates soil biogeochemistry and hydrology processes to predict changes in soil carbon and porosity on the basis of the fundamental mechanisms that protect soil organic matter (SOM): Sorption, Occlusion and Hypoxia.  OPRAS links to TopModel to predict the effects of land-management on catchment-scale streamflow.  For the NERC-AHRC project \"PARAGUAS\" (PÁRamos para AGUA y Sociedád), OPRAS was linked to a physically based catchment hydrology model (TopModel) to predict the effects of land-management on catchment-scale streamflow.  TopModel is a well-established and openly available model: https://cran.r-project.org/web/packages/topmodel/index.html.\n\nNote that OPRAS is not part of the UKCEH N14CP family of models; it is based on different principles.","description":"OPRAS predicts the formation and loss of organic matter and pores in soils.  It is used by researchers to predict changes in soil carbon and water-holding capacity in response to climate, nutrient inputs, and notably to soil drainage and re-wetting.","fundingSources":"Development of OPRAS was funded by UKRI strategic research programmes: NERC Macronutrient Cycles; NERC-AHRC Colombia-Bio.","id":"70c31779-4ccd-4e88-b852-2bf6ac9581bb","infrastructureCategory":{"value":"models","description":"Environmental models","infrastructureClass":"Digital infrastructures","uri":"http://vocabs.ceh.ac.uk/ri/model"},"infrastructureChallenge":[{"value":"Pollution"},{"value":"Climate change: mitigation"}],"lifecycle":"OPRAS was first developed under the the NERC Macronutrient Cycling programme and published as an equilibrium version in 2019.  A dynamic version was developed in 2020-22 for catchment-scale applications.  OPRAS now links to TopModel to predict the effects of land-management on catchment-scale streamflow.  Investment to date approx 1 person-year.","metadataDate":"2025-04-09T09:24:47","onlineResources":[{"url":"https://cran.r-project.org/web/packages/topmodel/index.html","function":"website","type":"OTHER"}],"owners":[{"displayName":"Ed Rowe","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"owner","email":"enquiries@ceh.ac.uk","fullName":"Ed Rowe"}],"partners":"OPRAS was developed by UKCEH.  Imperial College London (Wouter Buytaert) is a partner for implementing linked OPRAS-TopModel.","resourceIdentifiers":[{"code":"https://catalogue.ceh.ac.uk/id/70c31779-4ccd-4e88-b852-2bf6ac9581bb"}],"scienceArea":"Soils and Land Use","title":"Organic matter Protection through low Redox, Aggregation and Sorption (OPRAS)","type":"infrastructureRecord","uniqueness":"OPRAS is a highly innovative model of soil carbon and nutrient biogeochemistry, with novel capabilities compared to other models: (1) OPRAS integrates soil biogeochemistry and hydrology is based on actual physicochemical protection mechanisms for soil organic matter; (2) OPRAS predicts transitions among major soil groups (mineral <-> organomineral <-> peat); (3) the linked OPRAS-TopModel considers soil thickness and hydraulic properties to be dynamic rather than static (allowing pore volume to vary with compaction, etc) whilst maintaining a simple budget for soil stocks of mineral and organic matter.","uri":"https://catalogue.ceh.ac.uk/id/70c31779-4ccd-4e88-b852-2bf6ac9581bb","users":["OPRAS is used by UKCEH and other researchers.   "]}