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David Helms Profile picture
@davidhelms570
Jun 10 • 10 tweets • 6 min read Twitter logo Read on Twitter
Sediment has accumulated behind #KakhovkaHPP dam since 1955. Russian destruction of the dam released 18 cubic kilometers of stored water flushing 68 years of sediment into the northwest Black Sea, silting Dnipro harbors and damaging fragile marine ecosystems. ImageImageImageImage
Upper Left: Surface Current Direction and Velocity
Upper Right: 5 June - pre-flood
Lower Left: 9 June - Sediment advanced to Odesa
Lower Right: 10 June - Sediment advanced to Choromorsk
Satellite images are from MODIS True Color
go.nasa.gov/3oPRMQH
"Wells & water bodies in flooded areas may contain chemicals & infectious disease pathogens from cemeteries, latrines & landfills... at the bottom of the Kakhovka Hydroelectric Power Plant destroyed by Russians, there could be many hazardous substances"
pravda.com.ua/eng/news/2023/… ImageImage
Ukraine dam collapse: what scientists are watching
Nature, 9 June 2023
@MiryamNaddaf
nature.com/articles/d4158… Image
What are the consequences of the Russian terrorist attack at the Kakhovka HPP for wildlife?
@_UNCG_
uncg.org.ua/en/the-consequ…
Map of Ukraine's "Emerald" Conservation Network
interecocentre.weebly.com/interactive-ma…
emerald.eea.europa.eu
Black Sea is a unique marine habitat. Black Sea Marine Protected Areas potentially impacted by the #KakhovkaHPP flood include coastal Romania, Bulgaria and Turkish Straits
marinemammalhabitat.org/imma-eatlas/ Image

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More from @davidhelms570

David Helms Profile picture
Jun 12
1/ This thread rebuts claims made by Mikael "Vatnikersson" Valterson against @Ukrhydroenergo, saying Ukraine's state dam operator, "was the original culprit" in destroying the #KakhovkaHPP and exacerbating dam destruction flooding. A #NAFOWeather 🧵
2/ As "Readers" pointed out, the video Vatnikersson used to "prove" Ukraine sent water downstream to #KakhovkaHPP was almost 2 months old. The video proves nothing. Vatnikersson made no attempt to clarify the temporal discrepancy; the tweet is still posted. ImageImage
3/ Vatnikersson made several allegations in his tweet that accused Ukraine of destroying its own dam as well as causing post-dam failure flooding. I will unpack these allegations. Image
Read 25 tweets
David Helms Profile picture
Jun 5
1/ Soil moisture update: While #MudSeason is "officially over", locally heavy rain can and will degrade trafficability for periods of time. A #NAFOWeather 🧵
2/ BLUF: Updated soil moisture/trafficability matrix similar to 25 April forecast with a 1 month delay in seasonal drying conditions due to above average April rain. Last week of May had several thunderstorm days & locally heavy rain but overall dry conditions since May 1st. ImageImage
3/ As stated in previous tweet, some locations had heavy rain including eastern Kherson/northwest Zaporizhzhia, northeast Donetsk and southern Luhansk in the last week of May. However, June has been mostly rain free. ImageImageImage
Read 19 tweets
David Helms Profile picture
Jun 1
1/ I'm supporting @exit266 documenting the Black Sea Grain Initiative #BSGI #BlackSeaGrainInitiative providing marine wx impacting transit & inspection operations. This🧵is a bit off-topic, analyzing weather impact on @CarnivalCruise Sunshine cruise, 21-27 May 2023.
2/ On the evening of 26 May 2023 through mid-day 27 May 2023, the @CarnivalCruise ship #Sunshine experienced high winds and waves on its final leg of 21-27 May 2023 cruise from Charleston, South Carolina to The Bahamas Islands. Cite: @flyerscaptain @CrewCenter @CruiseHive @CNN Image
3/ First... some terms and definitions for the landlubbers ImageImage
Read 26 tweets
David Helms Profile picture
May 30
#KakhovkaReservoir #KakhovkaHPP
1/ Status Follow-up: 30 May 2023. Over-topping of #KakhovkaHPP dam continues, now occurring for a full month.
2/ Loop of several cloud-free Sentinel-2 passes of #KakhovkaHPP this month, latest 29 May 2023, show white turbulent flow downstream of sluice gates.
3/ @lhinnant published an article "Damage to Russian-occupied dam submerges Ukrainian reservoir island community" 25 May 2023 for @AP. Worth a read.
apnews.com/article/ukrain…
Read 9 tweets
David Helms Profile picture
May 29
#NAFOWeather 🧵
1/ Weather week in review (23-29 May 2023): Widespread thunderstorms provided significant rain near the Line of Conflict (LoC), with a range of 15-90 mm in the south and 30-100 mm in the east and north. Image
2/ Rainfall from thunderstorms was not uniform with some locations close to the LoC receiving weekly peak total rainfall 80-105 mm including Oleshky, Vuhledar, Bakhmut and Raihorodka. Image
3/ Daily peak rainfall totals from thunderstorms max'ed out at 30-60 mm per day causing local flooding as reported by social media validating satellite precipitation accumulation analysis.
Image
Read 8 tweets
David Helms Profile picture
May 28
Time to update the map @PeterGleick
#WaterIsLife
worldwater.org/conflict/map/
Iran, Taliban exchange heavy gunfire in conflict over water rights on Afghan border #WaterIsLife
pbs.org/newshour/world… Image
@PeterGleick Water Dispute Escalating between Iran and Afghanistan, August 2016
atlanticcouncil.org/wp-content/upl… ImageImage
Read 5 tweets

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