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David Helms Profile picture
@davidhelms570
May 30, 2023 • 9 tweets • 10 min read • Read on X
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#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…
4/ Spatial context of @lhinnant story of the flooding of families in the village of Lysohirka, Zaporizhzhia, located on the farthest upstream portion, right bank, of the #KakhovkaReservoir. Image
5/ @riley_mellen and @heytherehaley also published an article for @nytimes on 17 May 2023 about #KakhovkaHPP water level. Article included a nice
#PlanetLabs image from 3 May 2023 clearly showing dam over-topping.
Image
6/ #KakhovkaHPP image taken back on 11 NOV 2023 by @Maxar. Image was taken the day after Russian occupiers blew up the road and rain deck about sluice gates 26-28 (far left side of image below) to block UAF pursuit of RF forces retreating to the left. Image
7/ With the start of water over-topping #KakhovkaHPP dam late April 2023, #KakhovkaReservoir water level has ceased increasing, remaining between 17.36-17.55 meters (almost 2 meters above normal) since May 1st as indicated by @PoleTheia water level data from Sentinel-6 altimetry. Image
8/ cc @iaeaorg
@energoatom_ua
@DefenceU
@Ukrhydroenergo
@pwebbr
@ResponsibleSci
@eugenesimonov2
@NFLAUKandI
@BrianKuns
@PeterGleick
@DetectorMedia
@a_prokip @gbrumfiel @tom_bike @Gergyl @BruckenRuski @novakakhovka_ua @huruank
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More from @davidhelms570

David Helms Profile picture
Jan 15
1/ Update on river ice conditions on the lower Dnipro near UAF left bank beachhead. Average temperatures in the south have fallen below 0C since 8 JAN, much below 0C after 11 JAN lowering water temps to near 0C and starting river ice growth. Image
2/ Most recent visible imagery: Sentinel-2 (9 JAN) shows dark water indicating unfrozen water w/ no snow cover. LANDSAT8 (11 JAN) shows ice formation in the larger lakes between the Antonovsky Bridges. Ice is definitely forming on the Konka River but not yet on the Dnipro River.
Image
Image
3/ Sentinel-1 SAR timeseries:
11 JAN: Rough surface ( speckled gray) on Dnipro indicates wind waves on open water
15 JAN: Dark surface with white ridges on Dnipro RIver shows new ice (nilas, 5-10 cm thick); Konka river definitely frozen.
Read 6 tweets
David Helms Profile picture
Nov 19, 2023
On 8 NOV 2023, a RF missile struck a Liberian registered commercial ship in Odesa region port. This #NAFOWeather🧵examines why the ship was in Ukrainian port, initial findings on RF weapon used, subsequent data available to confirm initial findings & impact to #UkriCor transits.
2/ Prior to the 24 FEB 2022 full-scale RF invasion, Ukraine exported enough grain to feed 400 million people, most in the famine probe Global South.
topleadprojects.com/environmental-…
Image
3/ Since 24 FEB 2022, RF has systematically attacked Ukraine's ag infrastructure, blockaged ports & seized grain in occupied areas w/ the goal of weaponizing grain to pay for its war effort, hurt Ukraine's economy & deny food to Ukraine's export partners.

Image
Read 23 tweets
David Helms Profile picture
Oct 25, 2023
1/ There has been daily reports of clashes near the Antonovsky Rail Bridge crossing of the Dnipro river between Prydniprovs'ke and Poima since 18 October 2023. A #NAFOWeather🧵on the Dnipro wetland ground conditions supporting offensive operations.
Image
2/ First, key dates in this region: Important to note that RF used this location to ferry troops and vehicles in the fall 2022 and UAF has been been attacking RF obn the left bank near the Antonovsky Bridge 6 km downstream of this location in late June 2023. Image
3/ The Dnipro river delta wetlands is about 3.9 km wide at the Antonovsky Rail Bridge crossing. The crossing includes two bridges, 0.5 km bridge (destroyed) over the Dnipro main channel and a 40 meter bridge (destroyed) over the Verkhnya Konka River. Image
Read 16 tweets
David Helms Profile picture
Oct 15, 2023
1/ Fall 2023 #MudSeason “bezdorizhzhia (ukr.)/rasputiza" prediction. 15 OCT 2023 Update (version 1!), a #NAFOWeather 🧵
2/ BLUF: Fall 2023 #MudSeason onset will likely be delayed a month due to lower rainfall over east & south Ukraine from AUG thru early OCT 2023. The result of rainfall deficit, along with clear skies & lower humidity increased evaporation caused lower soil moisture than normal. Image
3/ Background: This prediction uses NATO Reference Mobility Model (NRMM) derived correlation between soil moisture and soil strength. While NRMM uses multiple land surface features to develop maximum speed predictions, the most time-variant feature is soil moisture. Image
Read 14 tweets
David Helms Profile picture
Sep 22, 2023
1/ On 17 JUL, Ukrainian #USVs damaged the Kerch vehicle bridge near Tuzla Island. On 3 AUG, Tanker SIG was severely damaged by a #USV while at anchor south of the Kerch bridge. In addition to sinking barges (see below), what has RF done to protect Kerch shipping? A #NAFOWeather🧵
2/ Pictures are today's ship position (mostly at anchor south of the Kerch bridge), the right picture includes the ship track heat map from 2022. Ships that anchored west of Port Taman in 2022 are now gone.
What happened?
Image
Image
3/ Sentinel 2 True Color loop shows northern most anchorage clearing out between 21 AUG and 10 SEP.
Read 15 tweets
David Helms Profile picture
Sep 10, 2023
1/ It has been 3 months since the Russians blew-up the Kakhovka HPP dam on 6 June 2023. What is happening to the Dnipro River hydrology and ecology? What are are the options for rebuilding the HPP and possibility for a Dnipro left-bank beachhead? A #NAFOWeather 🧵
Outline: Image
2/ K-HPP Destruction Impacts:
- Irrigation/agricultural land lost: 350,000-550,000 ha
- Drinking (population 700,000) and industrial water loss
- Zaporizhzhia NPP cooling pond water supply loss
- 14,000 homes flooded, many drowned

topleadprojects.com/environmental-…
theguardian.com/world/2023/jun…

Image
Image
3/ 6-11 June Water Level Changes: Nikopol (left y-axis) and Kherson City (right y-axis) from Vyshnevskyi, et al, 2023
Immediately after the Russians blew up the K-HPP dam, the Kakhovka Reservoir water level began lowering and within 6 hours, the Kherson City water level increased Image
Read 50 tweets

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