Developing and adapting soil process submodels for use in the pedodynamic orthod model.

M.R. Hoosbeek, R.B. Bryant

    Research output: Chapter in Book/Report/Conference proceedingChapterAcademic

    16 Citations (Scopus)


    This chapter examines the development and structure of the ORTHOD computer model which simulates soil forming processes involved in the formation of a Typic Haplorthod. It presents newly developed and adapted soil process sub models used as building blocks in an integrated pedodynamic model. The LEACHM model uses a numerical solution to the convection-dispersion equation to estimate chemical fluxes. Solute movement consists of three components: convective, diffusive, and dispersive transport. The soil temperature and volumetric water content data used as input to the microbial decomposition submodel were derived from the output of the soil temperature and water movement submodels. Ion exchange was recognized as an important process controlling the chemistry of the soil solution. Since the objective of the pedodynamic model is to simulate the chemistry and movement of the major chemical components, a chemical speciation and precipitation submodel was needed.
    Original languageEnglish
    Title of host publicationQuantitative modeling of soil forming processes
    EditorsR.B. Bryant, R.W. Arnold
    Place of PublicationMadison, USA
    PublisherSoil Science Society of America
    ISBN (Electronic)9780891189343
    ISBN (Print)9780891188148
    Publication statusPublished - 1994

    Publication series

    NameSSSA Special Publications
    PublisherASA, CSSA, SSSA Books
    ISSN (Electronic)2165-9826


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