Beach

Sopocka plaża ciągnie się wzdłuż całej wschodniej granicy miasta, na długości około 4km. Jest położona nad Zatoką Gdańską. Z parku na plażę prowadzi 39 wejść.

Między plażą a zabudową miejską położony jest pas wydm i park po północnej stronie mola. Wydmy porośnięte są roślinnością krzewiastą złożoną głównie z niskiej wierzby piaskowej, głogów. Wydmy porasta również niska roślinność, głównie trawy (wydmuchrzyca piaskowa zwyczajna, wydmuchrzyca piaskowa barwy sinej, piaskownica bałtycka, turzyca piaskowa).

Plaża ma szerokość od 200 do 20m. Obowiązuje na niej zakaz spożywania alkoholu. Kąpiel jest dozwolona na całej długości, w tym na kilku kąpieliskach, wyposażonych w toalety i natryski.

Sinice

Assessment 2018-08-03

Water useful for bathing

Assessment of the possibility of cyanobacteria multiplication: phenomenon has occurred in each of the last 4 years

Risk of cyanobacteria in the future: large

Particular attention is given to cyanobacteria, which produce toxic compounds. In the Baltic Sea, toxic blooms are created by a species of Nodularia spumigena, although there is also a number of typical freshwater species in the coastal waters, especially those of Dolichospermum and Microcystis. It was not found that strains of Apahnizomenon flosaque occurring in the Baltic produced toxins, unlike freshwater strains. Cyanobacteria are found in all water reservoirs, the problem only happens when their quantity increases.

The algae bloom is a term for a change in the colour of water due to proliferation of algae. When the algae blooms and continues, it adversely affects the appearance, quality and usability of the water reservoir. The colour of algae bloom is variable: blue-green, grey-green, greenish-brown and sometimes reddish-brown. This depends on the species making up the surface layer, the intensity of light and the age of bloom. Many species can secrete earth, or grassy odours. Such algal blooms can sometimes form foam at the edge of the bassin.

During the windless weather some cyanobacteria can float towards the surface of the water and create coats there. They look like spilled paint, jelly or flakes floating on the surface of the water. Coats of algae can quickly build up during windless days, but they can disappear as quickly as the wind suddenly increases and the undulation rises. Water blooms can be caused by the mass occurrence of one, two, or many species of micro-organisms, usually cyanobacteria.

Regardless of whether the blooms are due to cyanobacteria producing harmful compounds or not, their mass development is an adverse phenomenon. The impression of "water blooms" can also produce large amounts of tree pollen-especially pine trees, which in spring can be moved by the wind even over long distances and drooping to the surface of the water. By the wind and undulation of water the pollen can be transferred into the coastal zone of the lake, causing a pronounced yellow coloration of the water. The phenomenon can be observed in spring off the coast of the whole Baltic Sea.

Some cyanobacteria forming blooms are capable of producing toxins. The cause of this phenomenon is not fully known. These toxins have caused the death of wild and domestic animals, including swine, sheep, dogs and pressing fish in many countries. In case of humans, a rash has been reported in cases of skin contact with water and in cases of accidental ingestion of water (e.g. swimming). Hazardous is also inhalation of aerosols containing cyanobacteria toxins. Although blooms, as well as cyanobacteria, are not always toxic, it is impossible to determine whether the bloom is dangerous or not, based on the appearance of the water.