Modelling faecal coliform concentrations in streams by Jeremy Wilkinson, Alan Jenkins, Mark Wyer, David Kay PDF

By Jeremy Wilkinson, Alan Jenkins, Mark Wyer, David Kay

ISBN-10: 0948540702

ISBN-13: 9780948540707

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E. for dispersion only, as might occur in a still pond. e. for advection only, an unreal situation, used here to demonstrate the model. 2c showingtransport downstream and attenuation ofthe contaminant concentration. The ADE is utilised in the following models and is applied to salinityvariation, sediment and bacterialtransport. 1 1 uses the kinematic wave velocity instead ofmean velocity, the velocity ofthe flood-wave front is greater than the meanvelocity. m4), A is cross sectional area of flow (mi2), R is hydraulic radius and S, friction slope.

The concentrations at the top of the modelled reach are higher than at the bottom. This results from die-off and settlement. Scenariotests;inputloadings The aim of the coliform input loading scenarios was to demonstrate the effect of simple increases and decreases infaecal coliform concentrations that might result from changes in population density, land-use/stockingpractices or sewage effluent treatment processes. 8 shows the changes in model output to increases of + 15% and reductions of- 10% infaecal coliform loadings.

10000- o100000 _Thorverlen - o =10 ~= = 100V -~ IL -0 'a - =_ _ 10: 10 _ , OCI-89 No = 0 _A. _ , May-90 _ 1000_ IC~~~~~~~~~~~~~~~~~1 0 C a I =91L,,9 100 r _, Nov-90 C - 0 _. _ 1000 0 ^. Pye Oct-89Ma~^ , , ,_. 2 Datapreparation Because of the dynamnic nature of the relationship between flow and faecal coliforrn concentrations it was decided that a daily (or ideally, more frequent) time-step was suitable for runningthe new model. To run the model on a daily basis, it was necessary to provide dailytime-senes for flow and the upstream faecal coliforrn input concentration.

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Modelling faecal coliform concentrations in streams (1995)(en)(64s) by Jeremy Wilkinson, Alan Jenkins, Mark Wyer, David Kay

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