Question
How to postprocess *.dfsu files in MIKE+? Is it possible?
Yes, it is possible! There are two access points to postprocessing tools such as Data Viewer and Data Manager in MIKE+. The first place to find these tools is the "2D overland" tab - see Fig.1. Here the tools will present the *.dfsu file but it will be limited to the topographic data in the 2D domain (surface elevation/bathymetry).
Fig. 1 - Accessing Data Manager from the 2D overland tab.
The other access point to the tools is located under the results tab in the 2D files editors. This enables the option to select result files with multiple result items. - see Fig. 2
Fig. 2 - Accessing Data Manager from the Results Tab| 2D files editors.
In order to further manage result files, we need to focus on the Results Tab file editors, as shown in Fig. 2. The first step is to load the *.dfsu layer into Layers and Symbols. Go to Add Layer and create a layer based on the desired result item of the *.dfsu file- see Gif. 1.
Gif. 1 - Add a layer based on a result item of the *.dfsu file.
Once the file is loaded to MIKE+, it is possible to access the MIKE ZERO native tool Data Manager. Go to Results| 2D files editors and choose Data Manager - as shown previously in Fig. 2.
Choosing the option Data Manager will prompt a search dialog, instead of using the "<Browse>" combo-box hit the "OK" button and use the browser to locate the files. The browser will allow you to select the *.dfsu file to open in Data Manager inside MIKE+ as a pop-up window - see Gif. 2.
Once with the result open in Data Manager you can access processing tools such as calculate statistics, extract and export - see Fig 3.
Fig. 3 - Data manager tools.
This workflow allows the user to calculate the maximum, minimum and mean statistical values of each result item - see Fig. 4. Further, each computed statistical map can be exported as individual *.dfsu files for each item.
Fig. 4 - Computation of statistical values on Data Manager.
The third option under Tools enables the option to export the statistical items to a file in the *.dfsu format- see Fig 5.
Fig. 5 - Export statistical result items as individual files.
The data can be extracted based on points series or individual coordinates on the map, these series can be then exported as dfs0 format files - see Fig. 6.
Fig. 6 - Data Extraction in Data Manager.
In a similar way to accessing Data Manager, you can also access Data Viewer which enables more advanced visualization options of results and maps and even video creation. The advantages of working with Data Viewer lies on its versatile and flexible customization, as shown below - see Fig. 7.
Fig. 7 - Customized presentation of the same result item in Data Viewer.
Flood Maps and Flood Hazard Maps Generation
MIKE+ has been enabled with the option "Create flood map" and "Create hazard map" - see Fig. 8. The "Create flood map" features allow you to convert the *.dfsu and *.dfs2 2D overland result files into polygon shape files, this polygon layer will be discretized into categories based on the water depth. The tool simply gathers the neighboring cells with result values in similar ranges and generates polygon areas for those gathered elements.
Fig. 8 - Access to Create flood map and Create hazard map.
Setting up the configuration of Flood Map is simple, select your input 2D Result File, define your criteria for result item (total water depth, flow velocity).
The Flood map is not dynamic; thus, it will present the flooding conditions of a specific moment of your results, choose the time of your simulation that you want to present on the map. In the polygon categories what you will define is the ranges in which you want to group the grid values of the *.dfsu file (or *.dfs2), the example below creates a series of flood water level categories. If desired the user can define filter criteria to smooth and clean out the flood hazard maps by removing or merging polygons considered too small for the analysis and then define the location of the output map. See Fig. 9.
Fig. 9 - Configuration setup to create flood maps
Once created the Flood Map will be added automatically to MIKE+ as a polygon shapefile layer - see Fig. 10.
Fig. 10 - Flood Map presented in MIKE+
Creating Flood Hazard Maps in MIKE+ follows a similar fashion to creating Flood Maps, the main difference is that the output are raster format files deriving hazard values from 2D result files. In order to create the flood hazard map the result file must contain these result items:
The “Total Water Depth” or “Surface Elevation” and the “Current Speed” or the combination of “U Velocity” and “V Velocity”.
MIKE+ provides four hazard calculation methods, The Hazard (v, h), Hazard (v*h), UK Methods and the Italian Method, there are more details about these calculations explained in Chapter 22 of the Model Manager Guide MIKE+ Model Manager.
FURTHER INFORMATION AND USEFUL LINKS
MIKE+ 2D Overland Flow – Getting started with urban flood modelling
[Manuals and User Guides]
Release Notes
MIKEPlus Release Notes