KNAW Repository

A process-basedmodelforerosionof Macoma balthica-affectedmudbeds

Prooijen van, B.C. and Montserrat, F. and Herman, P.M.J. (2011) A process-basedmodelforerosionof Macoma balthica-affectedmudbeds. Continental Shelf Research, 31, 527-538. ISSN 0278-4343.

[img]PDF - Published Version
Restricted to KNAW only

720Kb

Official URL: http://dx.doi.org/10.1016/j.csr.2010.12.008

Abstract

Modelingtheeffectofbiotaonsedimentdynamicsisadifficulttask.Inthispaperwere-analyze experimentalresultsof Willows etal.(1998) on theeffectsof Macoma balthica on sedimenterosion. A process-basedframeworkisproposed,fullycompatiblewithaphysicaldescriptionoferosionprocesses in caseofnobiogenicinfluences.Thebedisrepresentedbyaflufflayerontopofasubstrate.Acharacteristic featureoftheframeworkisthatthesedimentisrepresentedbyaprobabilitydensitydistributionforthe criticalshearstress,allowingforTypeIandTypeIIerosion. M. balthica increasesthesedimentmassinthe fluff layer.Thisincreaseisdeterminedbyconsideringtheactionradius,theoverlapoffeedingareas,and the feedingrateperanimal.Thecalibratedactionradiusandfeedingratewereintherangeasfoundinthe literature.Thedistributionofsedimentovertheerodibilityclassesandtheerosionrateparameterare hardly influencedatall.Duetooverlappingfeedingareas,theeffectisnon-linearwithdensityofthe animals.Themodelresultsareincloseagreementwiththemeasuredresults,suggestingthatnofurther formulationsofbiologicaleffectsareneededtosimulatetheexperimentsof Willows etal.(1998). In nature,othereffectslikedisruptingthebiofilmbygrazingcanbeofimportanceandshouldbeincludedin a laterstage.Thisstudyemphasizesthecrucialroleofsedimentavailabilityandtheeffectofbiotaonit. This aspectneedsmoreattentioninfutureexperiments.Theproposedmodelturnedouttoworkwellfor the effectsof M. balthica and offersopportunitiestoincludeotherbiogeniceffectsinaprocess-basedway as well.

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:8906
Deposited On:29 Jun 2011 02:00
Last Modified:24 Apr 2012 16:42

Repository Staff Only: item control page