Vishnevskoe ( fin. Yskjärvi ) is a lake on the Karelian Isthmus in the Vyborg district of the Leningrad Region .
Lake | |
Vishnevskoe | |
---|---|
fin. Yskjärvi | |
Morphometry | |
Absolute height | 16 m |
Square | 9 [1] km² |
Pool | |
Pool area | 45.7 [1] km² |
Location | |
A country |
|
The subject of the Russian Federation | Leningrad region |
Area | Vyborg district |
Identifiers | |
HWR : |
The Iskritsa River flows out of the lake, connecting it with the Big Cancer Lake and the whole system of the Vuoksa River.
Lake Vishnevskoe was formed in a hollow on which melted glacial waters flowed in the past. Its length is 6.5 km, width - 3.1 km, area - 10.5 km². There are two islands on the lake. The coastline is simple, and the shores themselves are low and gentle. Almost all over, they are plowed up. Only from the north, close to the lake, is a ridge that forms a small cape with steep shores overgrown with forest; in the southwest, a small stretch of coast represents a flooded lowland. The lake basin has a saucer-shaped shape, somewhat elongated to the northwest and southeast. The greatest depth is 3 meters. Underwater slope from the edge of the water gently descends to the center. Near the coast, it is composed of sand, clay, and in some places pebbles, and at a depth it is covered with a 3-4 meter layer of brown silt. In summer, the water is uniformly warm from the surface to the bottom. Water - yellow-green color, slightly transparent. The pond is overgrown. Along the coast, reeds, reeds and cattails stretch in a wide ribbon, sometimes replaced by pods and ridges. Especially dense thickets - near the source of the Iskritsa River , originating near the village of Krasnoselskoye . As early as the 1920s, the width of the green strip bordering the lake did not exceed 30–50 meters, and now in some places it reaches 200–300 meters.
Big changes have occurred since then among the inhabitants of the lake. Formerly, the fish population was not distinguished by a great diversity of species, but it was numerous and reached a good weight. Two-kilogram bream, a large roach were caught, occasionally caught and pike weighing up to 9 kilograms. After a part of the lake was lowered to use the exposed coast for agricultural land, its level dropped another 1 meter. In this regard, frequent zamory, which led to the death of many fish species. The burbot disappeared, the roach , perch , and pike do not live up to large sizes. The most adapted to the new conditions were preserved: ruffe, roach, small perch. They do not represent commercial value, but for many years the fish goes from here to the farms of the Roshchinsky fur farm for fattening of fur-bearing animals.
In the summer of 1963, Lake Vishnevskoe became the object of research conducted by a group of employees of the Research Geographical Institute of Leningrad State University . They had to decide on the composition of silts at the bottom of the lake and the possibility of using them as fertilizer. The results were the most encouraging. A lot of organic matter, phosphorus, potassium and various trace elements that stimulate plant growth have been found in the silts. Mining of sludge from the bottom of the lake presents no difficulties, since it lies at a depth of 1–2 meters and can be removed to the surface by means of a pumping unit. Adding sludge to the fields, stretching along the shores of the lake, would increase their fertility [3] .
Notes
- ↑ 1 2 State Water Register: Lake Vishnevskoe (Yusk-Yarvi) . // textual.ru. The date of circulation is December 31, 2011. Archived on August 27, 2012.
- ↑ Surface water resources of the USSR: Hydrological knowledge. T. 2. Karelia and the North-West / ed. E. N. Tarakanova. - L .: Gidrometeoizdat, 1965. - 700 p.
- ↑ V.A. Kirillova, I.M. Raspopov. "Lakes of the Leningrad region." L .: Lenizdat, 1971