Yahong Kuang

Yahong Kuang

Joined: 1/20/2019

  • full water column and subset of column for Gate Data setting in MIKE21

    Wed, 20 May 2015 06:33:30 GMT – full water column and subset of column for Gate Data setting in MIKE21
    Hi,
    I want to add a gate in the Structures section in MIKE21, could anyone tell me what's the meaning of full water column and subset of column for Gate Data?

    I couldn't find such details in the manual or with the help of F1, is there any information (like manual, report, paper) that I can refer to?

    Thanks very much.

    Regards,
    Cathy

  • Boundary input in mike21 FM MT

    Wed, 15 Apr 2015 01:28:20 GMT – Boundary input in mike21 FM MT
    Hi all,

    I am setting up a MT model in MIKE21 FM, but I only have sediment concentration data at inlets and outlet. Is it possible for me to only give the inlet boundary conditions (chose the type of Specified values ) and use the sediment concentration at the outlet as calibration? If possible, how should I set the type at the outlet boundary? Many thanks.

    All the best.

    Regards,

    Cathy

  • MIK21 FM HD runs smoothly in flood year, but has CFL problem in drought year

    Thu, 12 Mar 2015 04:52:54 GMT – MIK21 FM HD runs smoothly in flood year, but has CFL problem in drought year
    Hi all,

    I am setting up a hydrodynamic model for a large shallow lake (about 3000km2) with complicated bathymetry (-2~35m). The water level increases significantly in flood period, but decrease significantly in dry period, therefore, the vegetation types are various (eg. woods, carex, grass).

    Discharge is used for upstream boundaries, and Water level is used for downstream boundary. Manning' M map is used in the model. For the Flood and Dry type, I selected Standard Flood and dry (Drying depth=0.005m, Flooding depth=0.05m, Wetting depth=0.1m ). The model can runs smoothly in flood year, the simulated water level at the downstream stations are good. But at the upstream locations, the water level is overestimated (sometime maybe 2m error) at low water stage while slightly underestimated at high water stage. Should I increase the Manning's M for the main waterbody and decrease M near the boundaries?

    Another problem is that, in drought year, it has CFL problem even with the same setup files. I tried to decrease the time step, but still didn't work.  However, if I set the wetting depth to be greater than 0.8m or select Advanced flood and dry (floodplain) and set the wetting depth to be 0.5m, the model works smoothly.  But just like those during low water level period in flood year, the water level are overestimated except for those downstream locations.

    Thanks for all the help.

    Regards,
    Katherine