EugeneDec 2

#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

EugeneNov 20

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

Show threadPutin's IBSOct 10

A 7-year-old boy who was wounded during the night attack by #Russian inhuman forces died in the hospital. Medics fought for the child's life until the very end, but the injuries were too severe.

A 45-year-old woman and a 45-year-old man are in the hospital, with medics assessing their condition as serious.

❗️ Passage over the #DniproHES dam in Zaporizhzhia is currently closed — these are precautionary measures.
Traffic will resume as soon as the security situation allows, added the #OVA.

Putin's IBSOct 10

"#russian terrorists doing what #russian terrorists do!"🤮🤮🤮

From https://t.me/Pravda_Gerashchenko

😡 A massive attack by #Russian terrorists on #Zaporizhzhia lasted more than 6 hours: a 7-year-old child was killed, two more people were hospitalized, and passage over the #DniproHES dam is temporarily closed

The #Russians launched at least 7 drone strikes on #Zaporizhzhia. The private sector and infrastructure facilities were attacked. Several fires broke out, reported the head of the #OVA, #Ivan_Fedorov