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Dammträsk
Dammträsk ( Swedish for "Pond Swamp") is a small man made lake within the Tyresån Lake System, located in Haninge Municipality, south of central Stockholm, Sweden. The lake receives water from Övre and Nedre Rudasjön south of the lake and empties into Drevviken north of it. Located just south of the residential area Kvarntorp, and north of the densely populated central Haninge, the wetland lake receives considerable amount of nutritive salts.Tyreså Collaboration Environmental impact The lake and the surrounding wetlands, together with local forests, are regarded as a valuable local natural resource.Haninge Municipality, ''Kvarntorp'' However, while the lake system as a whole is regarded as sensitive to surface runoff, Dammträsk is already too contaminated to be regarded as vulnerable.Haninge Municipality, ''Dagvattenstrategi'' Water has been deliberately redirected from Rudasjön to Dammträsk, which reduces contamination of the downstream lake, Drevviken, since much ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Övre Rudasjön
Övre Rudasjön (Swedish language, Swedish for "Upper Crucian carp Lake"), or Övre Rudan for short, is a lake in Haninge Municipality, 18 km (11 mi) south of central Stockholm, Sweden. Forming part of the Tyresån Lake System, its major inflow comes from lakes Nedre Rudasjön ("Lower Crucian carp Lake") and Trylen to the south, while its outflow passes over Dammträsk into Drevviken to the north. The tall buildings of Handen commercial centre along the eastern shore of the lake contrast the dense forest of the Rudan Open-air Area on the opposite shore. The proximity to the Stockholm commuter rail, commuter rail station at Handen, makes the lake easily accessible to a large number of people, while the forests surrounding it makes it attractive to open-air lovers. It is used for bathing in summers and cross-country skiing in winters. Compared to other lakes in the Tyresån Lake System, levels of phosphorus in the lake are moderate.''Appendix 5'' (PDF), Tyresåsamarbetet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drevviken
Drevviken is a lake in southern Stockholm, Sweden, shared by the four municipalities Stockholm, Haninge, Huddinge, and Tyresö. While much of the surrounding area is used for one-family houses, the lake and the green space north of it are considered to be of great recreational and natural importance and forms part of a suggested nature reserve around lake Flaten.Drevviken Catchment area Approximately two-thirds of the catchment area is occupied by settlements, mostly one-family houses. Three major industrial areas are located within the catchment area which is mostly dominated by forests with minor open grasslands. North of the lake is a deciduous forest containing herbaceous plants and rocks covered with brushwoods and lichen. Additionally, there is a fluvio-glacial deposit with a broad irrigated marsh and a scenic pine forest; and a wetland which is the remnant of a former stream.Vattenprogram, p 10.3-10.6 Environmental influence Stormwater from several suburbs empti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nedre Rudasjön
Nedre Rudasjön is a lake in Stockholm County, Södermanland, Sweden. Its maximum dimensions are approximately 590 metres by 200 metres. Nedre Rudasjön, or Nedre Rudan, is a lake in Haninge municipality in Stockholm which is part of the Tyresån's main catchment area. The lake is 14.5 meters deep, has an area of 0.0686 square kilometers, and is 39.3 meters above sea level. About 400 meters north of Nedre Rudan is Övre Rudasjön. The name Ruda is said to originate from the Old Swedish word for "clearing", but according to another theory, the name comes from the fact that there used to be plenty of carp fish ruda in the two lakes. History During the Bronze and Iron Ages, the Upper and Lower Rudasjöarna were connected and were part of a navigable watercourse that continued through Drevviken to Kalvfjärden and the Baltic Sea. Through the land uplift , the contact was lost, but remnants of such connection and settlement are preserved at Övre Rudasjön, where the ancient castle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geography Of Stockholm
The City of Stockholm is situated on fourteen islands and on the banks to the archipelago where Lake Mälaren meets the Baltic Sea. The city centre is virtually situated on the water. The area of Stockholm is one of several places in Sweden with a joint valley terrain. In these landscapes erosion along geological joints has split the flattish upper surfaces into low-lying plateaus. In the case of Stockholm the plateau surfaces are remnants of the Sub-Cambrian peneplain. Islands and islets Extant islands and islets Historical islands and islets References: Dufwa, ''Stockholms tekniska historia'', pp 49-50, 149-150 Lakes and watercourses The access to fresh water is excellent in Stockholm today. Historically, lakes and watercourses were used as refuse dumps and latrines, causing epidemic cholera and many other diseases. By the 1860s water was being drawn from Årstaviken, the waters south of Södermalm, and was treated in the first water-purifying plant at Skanstul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grass Carp
The grass carp (''Ctenopharyngodon idella'') is a species of large herbivorous freshwater fish in the family Cyprinidae, native to the Pacific Far East, with a native range stretching from northern Vietnam to the Amur River on the Sino-Russian border.Mandrak and Cudmore. 2004''Biological Synopsis of Grass Carp (Ctenopharyngodon idella)''. This Asian carp is the only species of the genus ''Ctenopharyngodon''. Grass carp are resident fish of large turbid rivers and associated floodplain lakes/wetlands with a wide range of temperature tolerance, and spawn at temperatures of . It has been cultivated as a food fish in China for centuries, being known as one of the "Four Great Domestic Fish" ( zh, 四大家鱼), but was later introduced to Europe and the United States for aquatic weed control, becoming the fish species with the largest reported farmed production globally, over five million tonnes per year. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Mare's Tail
''Hippuris vulgaris'' (from – ''horse'' and – ''tail''), known as mare's-tail or common mare's-tail, is a common aquatic ecosystem, aquatic flowering plant in the family Plantaginaceae. Its distribution ranges from Eurasia and North America to Greenland, the Tibetan Plateau and Arizona. It prefers non-acidic waters. Description The common mare's tail is a creeping, perennial plant, perennial herb, found in shallow waters and mud flats. It roots underwater, but most of its Leaf, leaves are above the water surface. The leaves occur in Whorl (botany), whorls of 6–12; those above water are 0.5 to 2.5 cm long and up to 3 mm wide, whereas those under water are thinner and limper, and longer than those above water, especially in deeper streams. The stems are solid and unbranched but often curve, and can be up to 60 cm long. In shallow water they project 20–30 cm out of the water. It grows from stout rhizomes. The flowers are inconspicuous, and not all plant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aquatic Plant
Aquatic plants, also referred to as hydrophytes, are vascular plants and Non-vascular plant, non-vascular plants that have adapted to live in aquatic ecosystem, aquatic environments (marine ecosystem, saltwater or freshwater ecosystem, freshwater). In lakes, rivers and wetlands, aquatic vegetations provide cover for aquatic animals such as fish, amphibians and aquatic insects, create substrate (marine biology), substrate for benthic invertebrates, produce oxygen via photosynthesis, and serve as food for some herbivorous wildlife. Familiar examples of aquatic plants include Nymphaeaceae, waterlily, Nelumbo, lotus, duckweeds, mosquito fern, floating heart, water milfoils, Hippuris, mare's tail, water lettuce, water hyacinth, and algae. Aquatic plants require special adaptation (biology), adaptations for prolonged inundation in water, and for buoyancy, floating at the water surface. The most common adaptation is the presence of lightweight internal packing cells, aerenchyma, but floa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biodiversity
Biodiversity is the variability of life, life on Earth. It can be measured on various levels. There is for example genetic variability, species diversity, ecosystem diversity and Phylogenetics, phylogenetic diversity. Diversity is not distributed evenly on Earth. It is greater in the tropics as a result of the warm climate and high primary productivity in the region near the equator. Tropical forest ecosystems cover less than one-fifth of Earth's terrestrial area and contain about 50% of the world's species. There are latitudinal gradients in species diversity for both marine and terrestrial taxa. Since Abiogenesis, life began on Earth, six major mass extinctions and several minor events have led to large and sudden drops in biodiversity. The Phanerozoic aeon (the last 540 million years) marked a rapid growth in biodiversity via the Cambrian explosion. In this period, the majority of Multicellular organism, multicellular Phylum, phyla first appeared. The next 400 mil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vascular Plant
Vascular plants (), also called tracheophytes (, ) or collectively tracheophyta (; ), are plants that have lignin, lignified tissues (the xylem) for conducting water and minerals throughout the plant. They also have a specialized non-lignified Tissue (biology), tissue (the phloem) to conduct products of photosynthesis. The group includes most embryophyte, land plants ( accepted known species) excluding mosses. Vascular plants include the clubmosses, Equisetum, horsetails, ferns, gymnosperms (including conifers), and angiosperms (flowering plants). They are contrasted with nonvascular plants such as mosses and green algae. Scientific names for the vascular plants group include Tracheophyta, Tracheobionta and Equisetopsida sensu lato, Equisetopsida ''sensu lato''. Some early land plants (the rhyniophytes) had less developed vascular tissue; the term eutracheophyte has been used for all other vascular plants, including all living ones. Historically, vascular plants were known as "hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petroleum
Petroleum, also known as crude oil or simply oil, is a naturally occurring, yellowish-black liquid chemical mixture found in geological formations, consisting mainly of hydrocarbons. The term ''petroleum'' refers both to naturally occurring unprocessed crude oil, as well as to petroleum products that consist of refining, refined crude oil. Petroleum is a fossil fuel formed over millions of years from anaerobic decay of organic materials from buried prehistoric life, prehistoric organisms, particularly planktons and algae, and 70% of the world's oil deposits were formed during the Mesozoic. Conventional reserves of petroleum are primarily recovered by oil drilling, drilling, which is done after a study of the relevant structural geology, sedimentary basin analysis, analysis of the sedimentary basin, and reservoir characterization, characterization of the petroleum reservoir. There are also unconventional (oil & gas) reservoir, unconventional reserves such as oil sands and oil sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Organochloride
Organochlorine chemistry is concerned with the properties of organochlorine compounds, or organochlorides, organic compounds that contain one or more carbon–chlorine bonds. The chloroalkane class (alkanes with one or more hydrogens substituted by chlorine) includes common examples. The wide structural variety and divergent chemical properties of organochlorides lead to a broad range of names, applications, and properties. Organochlorine compounds have wide use in many applications, though some are of profound environmental concern, with TCDD being one of the most notorious. Organochlorides such as trichloroethylene, tetrachloroethylene, dichloromethane and chloroform are commonly used as solvents and are referred to as "chlorinated solvents". Physical and chemical properties Chlorination modifies the physical properties of hydrocarbons in several ways. These compounds are typically denser than water due to the higher atomic weight of chlorine versus hydrogen. They have hig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dry Cleaner
Dry cleaning is any cleaning process for clothing and textiles using a solvent other than water. Clothes are instead soaked in a water-free liquid solvent (usually non-polar, as opposed to water which is a polar solvent). Perchloroethylene (known in the industry as "perc") is the most commonly used solvent, although alternative solvents such as hydrocarbons, and decamethylcyclopentasiloxane are also used. Most natural fibers can be washed in water but some synthetics (e.g., viscose) react poorly with water and should be dry cleaned if possible. If not, this could result in changes in texture, strength, and shape. Additionally, certain specialty fabrics, including silk and rayon, may also benefit from dry cleaning to prevent damage. History The ancient Greeks and Romans had some waterless methods to clean textiles, involving the use of powdered chemicals and absorbent clay (fuller's earth). By the 1700s, the French were using turpentine-based solvents for specialized cleanin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
