Closure
Article Abstract:
The alternative solution proposed by Saviz et al. in modeling the transport of metam sodium in the Upper Sacramento River is discussed. The Sacramento River has unidirectional channel flows which can be simulated by a one-dimensional hydraulic model. Variations in flows can be resolved by using a two-dimensional (2D) or a three-dimensional hydrodynamic model. Saviz and her colleagues used a 2D hydrodynamic model and approximated the results into a 1D river flow. Their method is almost the same as the mass balance method used by the researchers.
Publication Name: Journal of Environmental Engineering
Subject: Environmental issues
ISSN: 0733-9372
Year: 1998
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Closure
Article Abstract:
Comments made by S. David Graber regarding the irrelevance of the root-mean-square gradient of the 'G value' are discussed. It can be demonstrated that the transformation to a 'pure shear' in the form of a two-dimensional strain-rate tensor is feasible if an ideal, incompressible flow is assumed. The incompressible flow can be represented as a Mohr's circle with the flow stresses and strain-rates at the origin. Under this condition, the transformation derived by Camp and Stein is valid.
Publication Name: Journal of Environmental Engineering
Subject: Environmental issues
ISSN: 0733-9372
Year: 1998
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Closure
Article Abstract:
Comments made by David M. Crohn regarding virus density confidence limits in highly treated water are discussed. The virus inactivation process was described in a mathematical manner to consider the patchiness in the occurrence of virus particles; detection inefficiencies; variable sample sizes; and virus inactivation during wastewater treatment. It is also assumed that the Bernoulli damage process provides for an equal chance of inactivation for a virus during water treatment.
Publication Name: Journal of Environmental Engineering
Subject: Environmental issues
ISSN: 0733-9372
Year: 1998
User Contributions:
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