Subject: Three Inertial Term
The dynamic wave flow in SWMM5 and InfoSWMM is calculated from the following equation
Q = (Qold – dq2 + dq3*sigma + dq4*sigma ) / ( 1 + dq1 + dq5)
Figure 1 shows how Sigma is set based on the user selection of the Three Intertial Terms. Figure 2 shows how Sigma is calculated for the Dampen Option. If you use Ignore then dq3 and dq4 are ignored all of the time, if you use Dampen then dq3 and dq4 are used for a Froude number less than 0.5 and then the terms gradually fade away until a Froude number of 1 is reached. If you use Keep then the non linear terms are used all of the time no matter the value of the link Froude Number. There is one exception to this rule: If a closed link is full then the value of sigma is set to 0.0 no matter what is selected for the Intertial Term.
Figure 1. The value of Sigma for each of the Three Inertial Term Option
Figure 2. At each iteration for each link during the simulation the link Froude Number is calculated and based on the Froude Number the value of Sigma is Set.
Autodesk Technologist with Information about Stormwater Management Model (SWMM) for watershed water quality, hydrology and hydraulics modelers (Note this blog is not associated with the EPA). You will find Blog Posts on the Subjects of SWMM5, ICM SWMM, ICM InfoWorks, InfoSWMM and InfoSewer.
Tuesday, July 12, 2011
Three Inertial Term Options in SWMM 5 and InfoSWMM/H2OMAP SWMM
Subscribe to: Post Comments (Atom)
RTK SWMM5 Import to ICM using ODIC
Object Fields Import Fields Default Values RTK hydrograph ID ID Response ratio R - short term RFVOL_EFF 0.050 Time to peak T - short term ...
@Innovyze User forum where you can ask questions about our Water and Wastewater Products http://t.co/dwgCOo3fSP pic.twitter.com/R0QKG2dv...
Engine Error Number Description ERROR 101: memory allocation error. ...
From CHI - International Conference on Stormwater and Urban Water Systems Modeling, Toronto Canada (February 26 and 27) - Call for papers47th Annual International Conference Toronto, Canada February 26-27, 2014 Call for papers Have you implemented a good idea recen...
Post a Comment