WRRCTR No.176 Chemical residuals transport in aggregated soils: Mathematical simulation by the linear system approach

dc.contributor.author Liu, Clark C.K. en_US
dc.contributor.author Feng, Jing-Song en_US
dc.date.accessioned 2008-07-04
dc.date.available 2008-07-04
dc.date.issued 1988-02 en_US
dc.description Hawaii State General Fund Grant/Contract No. B 209 en_US
dc.description.abstract Groundwater contamination caused by residuals of agricultural chemicals and leachates from solid waste landfill sites is now one of the most critical environmental problems. Regulatory decisions regarding the use of agricultural chemicals and the control of the solid waste disposal require an understanding of the behavior and fate of residue chemicals in a subsurface environment. To meet this requirement, mathematical models that predict the pollution potential of groundwater contamination caused by various forms and amounts of waste inputs are commonly used as important management tools. Mathematical models have been traditionally formulated by following a physically based approach. The amount of chemicals within a transport volume is determined by mass flux into and out of the volume, and by kinetics of production and reduction within the volume. Relevant hydrodynamic characteristics and reaction kinetics are represented by specific model parameters. These parameters are then incorporated in a mathematical structure based on the mass conservation principle. The successful application of physically based models are often limited because of difficulties in solving the interrelated problems of parameter identification, system boundary definition, and mathematical solution. These problems can be largely alleviated by an alternative modeling approach which was developed based on a system theory. By following the system approach, dynamic relations between the chemical input at the soil surface and its subsequent downward movement are represented by system response functions that do not require knowledge of the intimate structure of relevant transport mechanisms. Techniques developed in this study were applied in the simulation of the transport of residuals of the pesticide DBCP in soils in the Kunia area of central Oahu, Hawaii, after an accidental spill of the chemical in April 1977. As a result, compatibility of the system modeling approach and a physically based modeling approach is demonstrated. This study also illustrates the computational superiority of the system modeling approach, especially for chemical residual transport in an aggregated soil where a bypassing phenomenon is obvious. en_US
dc.format.extent viii + 45 pages en_US
dc.identifier.citation Liu CCK, Feng JS. 1988. Chemical residuals transport in aggregated soils: mathematical simulation by the linear system approach. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical report, 176. en_US
dc.identifier.uri http://hdl.handle.net/10125/1830
dc.language.iso en-US en_US
dc.publisher Water Resources Research Center, University of Hawaii at Manoa en_US
dc.relation.ispartofseries WRRC Technical Report en_US
dc.relation.ispartofseries 176 en_US
dc.subject agricultural chemicals en_US
dc.subject mathematical models en_US
dc.subject soils en_US
dc.subject fumigants en_US
dc.subject solute transport model en_US
dc.subject groundwater contamination en_US
dc.subject DBCP en_US
dc.subject EDB en_US
dc.subject linear system modeling en_US
dc.subject Kunia en_US
dc.subject Oahu en_US
dc.subject Hawaii en_US
dc.subject.lcsh Soil pollution -- Mathematical models. en_US
dc.subject.lcsh Agricultural chemicals -- Environmental aspects. en_US
dc.subject.lcsh Groundwater -- Pollution -- Mathematical models. en_US
dc.subject.lcsh Dibromochloropropane -- Hawaii -- Oahu -- Environmental aspects. en_US
dc.title WRRCTR No.176 Chemical residuals transport in aggregated soils: Mathematical simulation by the linear system approach en_US
dc.type Report en_US
dc.type.dcmi Text en_US
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