Model Library

Capabilities

• MIKE 21 simulates water level changes and flows in response to forcing from waves, tides, river inflows, and meteorological effects;
• It has a modular design;
• MIKE 21 allows users to couple hydrodynamic and wave models;
• It includes a Shoreline Morphology (SM) module that models the evolution of coastal areas and shoreline changes;
• MIKE 21 can model the transport of substances like pollutants, sediments, and tracers;
• MIKE 21 FM is the extension of the MIKE 21 model, adding more capabilities to handle complex geometries and improve computational efficiency by offering flexible mesh options;
• The model is continuously improved by the developers.

Limitations

• Not open-source;
• The mesh size setting of the MIKE21 model could also affect the accuracy of model simulation (Lai et al., 2022);
• Costs to purchase a license and pay for annual support fees can be significant;
• The model lacks the capability to model the complex flow patterns within the hydraulic jump (Toombes and Chanson, 2011);
• If the topography data is provided in small tiles, these tiles need to be combined to form a single topography data set to be used (DHI, 2018).

Inputs

Bathymetry data, Boundary conditions, Initial conditions, Meteorological data, Hydrological data, Mesh/Grid setup, Friction coefficient, Calibration data, Validation data.

Outputs

• Maps/animations/tables/graphs/reports of time-series simulation of water movement, hydrological, and water quality parameters over specified periods or during rainfall events.
• Floodplain modeling.

References

Zhang, X., Qi, Y., Liu, F., et al. (2024). Predicting effects of non-point source pollution emission control schemes based on VMD-BiLSTM and MIKE21. Environmental Modelling and Assessment, 29, 797–812. https://doi.org/10.1007/s10666-024-09959-9

Shi, L., & Li, S. (2024). Simulation study on water quality of paddy field ditches considering the effects of rainfall and sediment release. Sustainability, 16, 1075. https://doi.org/10.3390/su16031075

Objectives

The objectives of this study were: (1) to develop a hybrid model of VMD-BiLSTM and MIKE21 as a means of analyzing the effects of NPS pollution emission control schemes; (2) to predict future stochastic hydrological conditions and model the water environment of the Weihe River for several years after the implementation of emission control schemes such as BMPs and LID; (3) to analyze the effects of different emission control measures under the influence of future stochastic hydrological conditions and determine the measures that should be prioritized in consideration of economics.

The objective of the study was to simulate the water quality of a paddy field ditch in Donghu Village, Jiangsu Province under different rainfall return periods and considering the influence of sediment release, in order to analyze the drainage water quality in the paddy field.