Modeling of phosphorus dynamics in aquatic sediments: I—model development

A model is developed to study the phosphorus dynamics in aquatic sediments and to conduct dynamic predictions of phosphorus release across a sediment–water interface. The model focuses on the sediment active layer below the sediment–water interface and is based on primary mechanisms regulating phosp...

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Bibliographic Details
Published in:Water research (Oxford) 2003-09, Vol.37 (16), p.3928-3938
Main Authors: Wang, Hong, Appan, Adhityan, Gulliver, John S.
Format: Article
Language:English
Subjects:
Applied sciences
Biological and physicochemical phenomena
Biological and physicochemical properties of pollutants. Interaction in the soil
Biological Availability
Diffusion
Dynamic model
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Eutrophication
Exact sciences and technology
Forecasting
Geologic Sediments - chemistry
Kinetics
Models, Theoretical
Natural water pollution
Numerical computation
Organic Chemicals
Phosphorus
Phosphorus - analysis
Phosphorus - chemistry
Phosphorus - metabolism
Pollution
Pollution, environment geology
Release flux
Sediments
Soil and sediments pollution
Water treatment and pollution
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Summary:A model is developed to study the phosphorus dynamics in aquatic sediments and to conduct dynamic predictions of phosphorus release across a sediment–water interface. The model focuses on the sediment active layer below the sediment–water interface and is based on primary mechanisms regulating phosphorus behavior in sediments, including effective diffusion, bioturbation mixing and burial processes (transport), organic decomposition, sorption kinetic processes and non-linear partitioning (mobilization). The effects of environmental factors such as dissolved oxygen and temperature are taken into account. The model is solved by numerical integration. The primary difference from models in the literature is that the model directly describes the dynamic behavior of dissolved, particulate exchangeable ortho-phosphorus and organic phosphorus in sediments, and incorporates dynamic sorption and non-linear partitioning processes. These improve model mechanisms and allow regulation of phosphorus flux through the sediment reservoir that acts as both a source and sink of phosphorus.
ISSN:0043-1354
1879-2448
DOI:10.1016/S0043-1354(03)00304-X