TY - JOUR
AU - Valocchi, Albert
AB -  Unit of SoilScience, Cornell University, Ithaca,New York ALBERT VALOCCHI Department CivilEngineering, of University Illinois Urbana-Champaign, of at Urbana Widdowson [thisissue] raiseda number interesting has of points about our evaluation of mathematicalmodelsof the transport of biologically reacting solutes in saturated soils and aquifers [Bayeye and Valocchi, 1989]. He has summarized his remarks in the four points listed toward the end of hiscomment.In the followingparagraphs, reply to each we of these points sequentially. The first point concernsthe similaritiesexistingbetween models I and II. As formulated by Bayeye and VaIocchi [1989],these two modelsare conceptuallyvery different;the firstinvolvesno assumption whatsoeveron the microscopic distribution of bacteria or on any geometricalfeature of the In his third point, Widdowson [this issue] remarks correctly that the mathematicalequivalenceof models I and II is only formal because the capacitancelike coefficient, y, used in model I is assumed constant, while in model II the capacitancelike coefficient (Ds/•) Ncrrrc depends the 2 on biomassdensityvia Nc and therefore is variable. As illus- trated by Figure 1 of Widdowson [this issue], this key dissimilarity between models I and II results in different model predictions. (It is important to note that the dynamic natureof the capacitanceterm of model II which gives rise to the discrepancies 
TI - Reply (to “Comment on ‘An evaluation of mathematical models of the transport of biologically reacting solutes in saturated soils and aquifers’ by Philippe Baveye and Albert Valocchi”)
JF - Water Resources Research
DO - 10.1029/91WR00577
DA - 1991-06-01
UR - https://www.deepdyve.com/lp/wiley/reply-to-comment-on-an-evaluation-of-mathematical-models-of-the-IoNHPprFSP
SP - 1379
EP - 1380
VL - 27
IS - 6
DP - DeepDyve
ER -