Model:CrevasseFlow

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CrevasseFlow

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as Model type Tool Model part of larger framework Note on status model Date note status model Spatial dimensions 1D Spatial extent Landscape-Scale Model domain One-line model description The module calculates crevasse splay morphology and water discharge outflow of a crevasse splay. Extended model description The module is designed to calculate morphological changes and water discharge outflow of a crevasse splay that is triggered by a preset flood event and evolves afterwards. The inputs for "mainCS.m" should be daily water discharge and sediment flux series of the trunk channel upstream the crevasse splay. The outputs will be daily series for the cross-sectional parameters of the crevasse splay, and daily water discharge series of the trunk channel downstream the crevasse splay. One limitation of the present version is it only calculates the expanding and healing of a crevasse splay, while ignores the possible morphological change (demise or revival) of the trunk channel downstream the crevasse splay. Another limitation is the codes are originally written for the Lower Yellow River(a suspended load dominated river) for the purpose of calculating sediment budget in the Lower Yellow over a long timescale, say as long as hundreds years, so the present module can not be applied to other alluvial rivers without modifying those lines related to channel geometry, bankfull discharge and bank erosion(deposition). Keywords: coastal evolution, Name Yunzhen Chen Type of contact Model developer Institute / Organization Nanjing University Postal address 1 22 Hankou Road Postal address 2 Town / City Nanjing Postal code 210093 State Country China Email address chenyunzhen1010@gmail.com Phone +8613851402809 Fax Supported platforms Unix, Linux, Mac OS, Windows Other platform Programming language Matlab Other program language Code optimized Single Processor Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 2009 Does model development still take place? Yes If above answer is no, provide end year model development Code development status When did you indicate the 'code development status'? Model availability As code Source code availability (Or provide future intension) Through CSDMS repository Source web address Source csdms web address Program license type GPL v2 Program license type other Memory requirements Typical run time seconds Describe input parameters daily water discharge series;daily sediment flux series; averaged channel cross-sectional depth, averaged channel cross-sectional width; floodplain width; manning coefficients of the channel and floodplain; longitudinal channel slope; Channel bed's super-elevation above the floodplain where sedimentation rate is close to 0; M-coefficient for erosion rate for the bottom of crevasse splay; M-coefficient for erosion rate for the two side slopes of crevasse splay; critical velocity for erosion; critical velocity for deposition; width of dike at the root; cross valley slope; settling velocity of suspended load in the channel. Input format ASCII Other input format Describe output parameters averaged daily water discharge to lower reach of crevasse splay; averaged daily crevasse splay depth; averaged daily crevasse splay width Output format ASCII Other output format Pre-processing software needed? No Describe pre-processing software Post-processing software needed? No Describe post-processing software Visualization software needed? No If above answer is yes Other visualization software Describe processes represented by the model As a crevasse splay evolves, the slope of its outflow should be no less than the slope of lower channel; and the bottom elevation of a crevasse splay should be no lower than the elevation of lowest point of channel bed, so the bottom elevation of the lowest point that a crevasse splay is able to cut down is max(hs, Zcsb). A ratio of Q above the bottom of crevasse splay can be distributed to outflow of crevasse splay. After flow parameters for the outflow of crevasse splay are calculated, the erosion (deposition) rate of crevasse splay can be calculated, thus the morphology of crevasse splay can be updated. When the crevasse splay has not yet cut down to the lowest point max(hs,Zcsb), it can be both widened and deepened. When the crevasse splay has cut down to the lowest point max(hs,Zcsb), it can only be widened or silted vertically. Describe key physical parameters and equations Key physical parameters: Q: water discharge upstream crevasse splay; Qcs: outflow discharge of crevasse splay; Qabove: the water discharge above the bottom of crevasse splay; rq: the discharge ratio of Qcs and Qabove; hs: channel belt's super-elevation (the elevation of lowest point of channel bed); Zcs: bottom elevation of crevasse splay; Bcs: width of crevasse splay; Hcs: flow depth of crevasse splay; Vcs: flow velocity of crevasse splay; jcs: slope of the outflow of crevasse splay; Zcsb: bottom elevation of a crevasse splay whose flow slope is equal to the channel slope j; Key physical equations: Zcs<=max(hs,Zcsb); rq=(1.55-1.45*Fi)*Bcs/wc+0.16*(1-2*Fi), in which Fi is the Fraud number for flow in the trunk channel, wc is width of the trunk channel; Hcs=(nc*Qcs/sqrt(jcs)/Bcs)^(3/5); Vcs=Qcs/Hcs/Bcs; dE=M*(Vcs^2-ucre^2)/ucre^2*dt, where M is M-coefficient for erosion rate for crevasse slpay, ucre is critical velocity for erosion, dt is time step; dD=Sv*(1-Vcs^2/ucrd^2)*ws/0.6*dt, where Sv is volume sediment concentration, ucrd is critical velocity for deposition, ws is settling velocity of suspended load, dt is time step. Describe length scale and resolution constraints length scale: meters resolution constraint: centimeter Describe time scale and resolution constraints time scale: decades resolution constraints: day Describe any numerical limitations and issues Describe available calibration data sets Upload calibration data sets if available: Describe available test data sets Q(m^3/s): daily water discharge series, 365 by 1 matrix Qs(kg/s): daily sediment flux series, 365 by 1 matrix The trigger flood event is set at the 232th day Upload test data sets if available: Media:Testdata.rar Describe ideal data for testing As a test, you can use the attached test data Q and Qs, and run {Qd,Delta_hcs,Bcs,Delta_hcsd,Bcsd,Qout,Qcs,Zcs,Hcs,Vcs}=mainCS(Q,Qs,365,232,1,2,965,2.3,4795,0.009,0.03,1.377e-4,-2,0.0005,0.004,1.5,0.7,1800,2.5e-4,25,4.5e-4) Do you have current or future plans for collaborating with other researchers? I'm now writing some papers coauthored with James Syvitski, Irina Overeem and Albert Kettner, on historical channel avulsions and source-to-sink sediment budget models of the Yellow River basin. Is there a manual available? No Upload manual if available: Model website if any Model forum / discussion board Comments This part will be filled out by CSDMS staff OpenMI compliant No not possible BMI compliant No not possible WMT component Not yet"Not yet" is not in the list (Yes, In progress, No but possible, No not possible) of allowed values for the "Code CMT compliant or not" property. PyMT component Is this a data component Can be coupled with:

Model info Authors Yunzhen Chen Source code View in CSDMS GitHub repository DOI Download CrevasseFlow version: 0.0.1 Doi: 10.1594/IEDA/100105 Model citations Nr. of publications: 2 Total citations: 0 h-index: --"--" is not a number. m-quotient: 0 QR-code Link to this page Other models by author CrevasseFlow

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