Despite advances in modeling, such as graphical user interfaces,
the use of GIS layers, and databases for developing input files,
the approaches to modeling phosphorus (P) have not changed since
their initial development in the 1980s. Current understanding of P
processes has evolved and this new information needs to be
incorporated into the current models. Filling this need, Modeling
Phosphorus in the Environment describes basic approaches to
modeling P, how the current models implement these approaches, and
ways to improve them.
The book sets the scene with a review of general approaches to
modeling runoff and erosion, P in runoff, leaching of P, stream
processes that affect P, and an examination of the important issue
of model uncertainty. It describes state-of-the-science
watershed-scale P transport models including dynamic semi-disturbed
models, models of intermediate complexity, and two lumped models.
Phosphorus Indexes (PIs) represent one end of the modeling spectrum
and the book takes a comprehensive look at PIs developed in each
state, and illustrates some of the problems encountered when
incorporating PIs into farm-scale manure management software. The
book discusses monitoring data, which is critical for calibrating
models, and concludes with suggestions for improving the modeling
of P.
From researching mechanisms to applying regulations, the uses of
phosphorus models have increased as our knowledge of the effects of
phosphorus in the environment has increased. Drawing on
contributions from experts, the book gives you the tools to select
the model that best fits your needs.
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