The aim of this article is to analyze the consequences of the military invasion of the Russian Federation on February 24, 2022 on the water bodies of Ukraine. In particular, this article presents an analysis of the consequences of military operations on reservoirs. In order to prevent the enemy from reaching the dam of the Kyiv Reservoir and to protect Kyiv from the aggressor in late February-early March of this year, the sluice of the pumping station on the Kozarovychi Dam was blown up. Because, the possible destruction of this dam could have enormous destructive consequences for the entire cascade of reservoirs and the territories adjacent to them. As a result, a huge area of about 2,500 hectares of the Irpin’ floodplain was flooded, fundamentally changing both the military and the environmental situation. Also, Russian troops launched a missile attack on the dam of the Karachuniv Reservoir near the Kryvyi Rih city. The water level in the Ingulets River rose sharply by 2 meters, flooding the territories near the river, including part of the Kryvyi Rih city. The ecological condition of this territory was significantly damaged, private buildings were heavily flooded. Water quality in this river has deteriorated, the content of nitrogen and other elements has increased in it. The Oskol Reservoir in the east of Ukraine was also destroyed. As a result of the leakage of a significant amount of water, the muddy bottom has been exposed to water and is subject to wind erosion. The hydrological regime of the coastal area has changed. Rare species of flora and young fish population have been lost. Destruction of reservoirs and damage to the environment will continue until the war ends. And it is necessary to do everything possible so that it ends as soon as possible

The quantitative indicators of land growth in the Ukrainian part of the Danube delta are considered. Comparison of Landsat satellite images in three key areas of the delta showed that for the period 1975-2020 the area of wetlands at the mouth of the Сhilia channel increased by 1448 hectares due to the accumulation of sediments between the Starostambul and Limba branches and their overgrowth with vegetation. In the area of the Bystroe channel, the area of new lands increased by 1037 hectares due to the artificial deepening of this channel for the Ukrainian ships passage into the Danube River and the deposition of sediments along the coast. A slightly smaller increase in land cover (797 ha) was found in the northern part of the coast of the Ukrainian part of the delta, where saline and carbonate soils are formed. In the future, active land growth is expected in the Musura bay between the mouths of the Starostambul and Sulina branches, ie at the contact of Ukraine and Romania. Some changes in these parameters are expected after a powerful flood in 2021, which will become known after the establishment of a relative equilibrium between the processes of accumulation and erosion after this extreme event.

Reservoirs provide an electricity generation, promote the development of water transport, municipal and industrial water supply, irrigation, fisheries, recreation and other economic and social needs. However, calls are increasingly being made to limit the creation of new artificial reservoirs and even to destroy existing ones. The reason for this is the significant and very real negative environmental consequences of their creation and functioning – flooding of large areas of valuable land in river valleys, relocation of large numbers of people to new areas, flooding of low and erosion of high banks of reservoirs, deterioration of river water quality due to stagnation and "blooming” and many others. The aim of this work is to analyze the peculiarities of reforming the shores of the Kaniv Reservoir under the impact of hydrological and morphological processes, measures for the coast protection from erosion, deepening the channel and alluvium of new lands by dredging (mainly in the upper part of the reservoir) are considered. The study of this problem in the reservoirs of the Dnieper cascade, including Kaniv, we started from 1993-1997. Therefore, research methods have changed significantly at different stages. Standard methods of soil science were used to study the impact of the reservoir on the coastal soils, primarily on flooding, waterlogging and soil erosion. Since 2010, more detailed terresrial and water expeditionary routes (land) studies have been started to study the overgrowth of the reservoir with hydrophytic and hygrophytic vegetation with the formation of hydromorphic soils on the islands of the reservoir and its coast. Remote sensing methods of the Earth for analyzing the series of space images Landsat-2, 4-5, 7 and 8 were used to study the temporal and spatial changes of landscapes, as well as geospatial positioning of observation points by GARMIN GPS receiver. The important role of the dams construction and pumping stations to protect the low shores of the reservoir from flooding was noted, which, however, created significant problems in the operation of the facility due to rising electricity prices. Attention is paid to the ecological consequences of the new alluvial lands development within the reservoir water area, in particular to “blooming” and deterioration of water quality, as well as to the limitation of the ability to pass extreme floods and the threat of adjacent territories submergence. The nature of erosion and abrasion of the high right bank was studied with the use of a quadcopter, mainly in the area from the village of Rzhishchiv to the village of Trakhtemiriv. The role of marl clays in weakening the abrasion of shores is emphasized and their vulnerability to destruction is shown. The role and development of ravines on the coast and their participation in the fragmentary formation of hydromorphic landscapes along steep cliffs are noted. On the low left bank there is a reformation of the shores in the area from the village of Kyiliv to the Rzhyshchiv military range, where large areas are set aside for fisheries, hunting and recreational activities, as a result of which the wetlands are reduced. The uncertainty of the problem of pumping the water of the Trubizh River into the reservoir to protect the floodplain lands from submergence is emphasized. It is not recommended to use “Raketa” ships for water transport in this reservoir due to their negative impact on shoreline abrasion.

Розглянуті екологічні аспекти затоплення долини річки Ірпінь під час героїчної оборони столиці України міста Київ від військової агресії. Відзначено, що підрив водоскиду на Козаровицькій дамбі дав можливість затопити долину водами Київського водосховища від дамби до селищ Рахівка й Мощун, тобто на відстань коло 20 км, а ділянка між селищами Мощун і Гостомель була обводнена малими водоймами приток Ірпеня. Унаслідок цього долина Ірпеня стала практично непрохідною для важкої техніки агресора. Але при затопленні величезної території існує загроза забруднення поверхневих вод агрохімікатами, відходами життєдіяльності й господарювання сільського населення підтоплених населених пунктів, а також токсичними речовинами знищеної військової техніки. Коротко аналізується й проблема підтоплення та навіть затоплення окраїн селищ Демидів, Козаровичі й садиб і дач, збудованих на меліорованих землях. Підкреслена необхідність відновлення Ірпінської меліоративної системи після відкачування води у Київське водосховище, а також допомоги населенню, що постраждало від підтоплення.