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Nabarlek Pit decommissioning migration of sulphate, nitrate and radium ions in groundwater - preliminary modelling

Details:

Title

Nabarlek Pit decommissioning migration of sulphate, nitrate and radium ions in groundwater - preliminary modelling

Creator

Appleyard, S.

Collection

E-Publications; E-Books; PublicationNT; Report ; 41/1984

Date

1984-04-01

Description

Made available via the Publications (Legal Deposit) Act 2004 (NT).

Notes

Date:1984-04

Language

English

Publisher name

Dept. of Transport and Works

Place of publication

Darwin

Series

Report ; 41/1984

File type

application/pdf.

Copyright owner

Check within Publication or with content Publisher.

Parent handle

https://hdl.handle.net/10070/228496

Citation address

https://hdl.handle.net/10070/674076

Page content

Technical Report WRD84041 Viewed at 14:07:09 on 29/07/2010 Page 23 of 34. I I I I I I I I I I I I I I I I I I I I APPENDIX A SOLUTE TRF~SPORT EQUATIONS The concentration of a seepage pulse in an isotropic, porous medium varies with time and space according to the set of equations: C(x,t) ='C A(x,t) ~ 0 lCOA(X,t) + C i Q(t) + C. Q(t) :L c. G(x,t) :L - c. G{x,t) :L o ~ ~ < ~ ~ 1-0 -C A(x t-t ) o ' 0 (Van Genuchten, 1981) The background sulphate and nitrate ion concentrations in groundwater at Nabar lek (C.) I,ere assumed to be zero. This :L equation set can then be simplified C (x , t) = ( C : 0 A(x,t) A (x, t) o , ~ l where A(x,t) is de::ined .4 (.:r.t) o < t.$ to Co A(x,t-to ) t>o a - . '" . --,-" --, ex::> (r - u) . I" -'- u)x 1 '2DJ i vx pi " r Rx + ~t 1 expo - - - leric ,-=-='-----'.,:.\. DR, - l2(DRt)1.~ J and u v (1 + 4 The terms used in this expression are set out belol':: Terms Co D R t u 'J x )J SA2/11: TJ Meaning Initial concentration Dispersion coefficient Retardation factor time V[l + 4 flD/ V2j!, pore water velocity Distance General first order decay constant


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