Analytical solution and timescale for transport of reacting solutes in rivers and streams
1998 (English)In: Water resources research, ISSN 0043-1397, E-ISSN 1944-7973, Vol. 34, no 10, 2703-2716 p.Article in journal (Refereed) Published
A number of biogeochemicarle actionsa nd lateral hydrodynamicm ixing affectsthe transport of solute elements in streams and rivers. The combination of the variousmechanismsg ivesr ise to an accumulationo f the solute in temporary storagez ones and aretardation of solute migration. A new model framework is proposed from which ananalyticals olutioni s derivedd escribingth e concentrationa s a function of distancea longthe stream, depth into storage zones, and time. The model includes the effects of sorptionof solutest o suspendeds olidsa nd bed sediments,a lateral exchangew ith the storagezones, first-order reactions, and dilution. The migration velocity is close to the advectionvelocityo f the streamf or a short travel distance,b ut it continuouslyd ecreasesa s thedistancei ncreasesT. he timescaleo f the processi s linearly related to a modifiedDamk6hler number; a dimensionlessfo rm of the lateral exchangec oefficient.T heanalyticals olutionh as been verified for two tracer experimentsw ith both a sorbinga nd anonreactive tracer and the Cr transport in the Vistula River, Poland. The lateral diffusioncoefficient can be tentatively evaluated from the transport of Chernobyl Cs in severalEuropeanri versa sa speciacl aseo f the interpretativme odel.T he lateralm ixingc oefficientvariesw iths treamc onditionins t heo rdero f 0.1 x 10- 6 < Ds < 10 x 10- 6 (mZ/s).
Place, publisher, year, edition, pages
1998. Vol. 34, no 10, 2703-2716 p.
IdentifiersURN: urn:nbn:se:uu:diva-27795DOI: 10.1029/98WR01338OAI: oai:DiVA.org:uu-27795DiVA: diva2:55691