#DniproHesFlood
🛰️ Dam-break modelling with GRASS GIS

I used the r.damflood module in GRASS GIS on a historical scenario:
the destruction of the DniproHES dam by Soviet forces in August 1941 during their retreat from Ukraine.

I reconstructed a pre-war DEM of the Dnipro River from old topographic maps, modeled the dam structure, and created a breach raster.

Using r.damflood, I simulated the propagation of the flood wave over the first 24 hours after the dam explosion.
Based on this model, I generated a visualization showing the wave dynamics.

All tools used are fully open-source.
The results have not yet been published anywhere.

#Geospatial #GIS #HistoricalGIS #DigitalHistory #Cartography #OpenData #DataAnalysis #DEM #TerrainModeling #Hydrology #DamBreak #Dnipro #DniproHES #Ukraine #Zaporizhzhia #QGIS #SAGAGIS #GRASS #FOSS4G

Geospatial analysis and modeling is not only about:
1. downloading Copernicus data,
2. generating pretty maps,
3. calling it “analysis”.

In reality it often means years of collecting and reconciling heterogeneous data from different eras: digitizing historical maps, fixing coordinate systems, validating geometry through indirect evidence. This stage can easily take more time than all later modeling.

The images show how I digitized and georeferenced 1920s–1940s topographic maps of the lower Dnipro region. After transforming them into a unified coordinate system, I used them to reconstruct the pre-flood terrain (before the Kakhovka Reservoir).
That DEM later became the basis for modeling the 1941 DniproHES dam-break wave.

…This data-preparation phase alone took me almost four years.

#Geospatial #GIS #HistoricalGIS #DigitalHistory
#RemoteSensing #Cartography #OpenData #DataAnalysis #DEM #TerrainModeling #Hydrology #DamBreak #Dnipro #DniproHES #Ukraine #Zaporizhzhia #QGIS #SAGAGIS #GRASS #FOSS #DniproHesFlood

Start and end #dates are very important for a #HistoricalGIS project. We managed to stuff dates into more of the website’s nooks and crannies, so you always know which stage of a boundary or building’s evolution you’re looking at, or whether it’s even the one you’re looking for.

#HGIS

For all you folks with ancient flash websites you wish you could bring back, I would recommend checking out Ruffle. I managed to get a few of my old maps circa 2008 sorta running. AS3 support is not quite ready but gets better each day.

I decided to publish them in pseudo-working state so they can be slowly uncovered from the digital sands as the library develops. https://yuletide.github.io/flash-site/
#flash #gischat #demography #historicalgis #slowtech #oldweb

Noted: Martí-Henneberg, Jordi, Mateu Morillas Torné, Eduard Álvarez, and Kaloyan Stanev. Historical GIS of Europe. Departament de Geografia i Sociologia, Universitat de Lleida. Accessed April 27, 2022. http://europa.udl.cat/.

#HistoricalGIS