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Loch Lomond
Loch Lomond (/ˈlɒx ˈloʊmənd/; Scottish Gaelic: Loch Laomainn) is a freshwater Scottish loch which crosses the Highland Boundary Fault (HBF), often considered the boundary between the lowlands of Central Scotland and the Highlands. Traditionally forming part of the boundary between the counties of Stirlingshire and Dunbartonshire, Loch Lomond is split between the council areas of Stirling, Argyll and Bute and West Dunbartonshire. Its southern shores are about 23 kilometres (14 mi) northwest of the centre of Glasgow, Scotland's largest city. The Loch forms part of the Loch Lomond and The Trossachs National Park which was established in 2002. From a limnological perspective, Loch Lomond is classified as a dimictic lake, meaning it typically undergoes two mixing periods each year. This occurs in the spring and autumn when the water column becomes uniformly mixed due to temperature-driven density changes
Loch Lomond is 36.4 kilometres (22.6 mi) long and between one and eight kilometres (1⁄2–5 miles) wide, with a surface area of 71 km2 (27.5 sq mi). It is the largest lake in Great Britain by surface area; in the United Kingdom, it is surpassed only by Lough Neagh and Lough Erne in Northern Ireland. In the British Isles as a whole there are several larger loughs in the Republic of Ireland. The loch has a maximum depth of about 190 metres (620 ft) in the deeper northern portion, although the southern part of the loch rarely exceeds 30 metres (98 ft) in depth. The total volume of Loch Lomond is 2.6 km3 (0.62 cu mi), making it the second largest lake in Great Britain, after Loch Ness, by water volume.Due to its considerable depth and latitudinal location, Loch Lomond exhibits thermal stratification during the summer months, with a distinct epilimnion, metalimnion, and hypolimnion forming in deeper areas. These stratification patterns have important implications for nutrient cycling and aquatic ecology within the loch. During periods of stratification, a decrease in hypolimnetic oxygen can occur in the deeper northern basin, which can affect the species distribution patterns.
Loch Lomond is considered oligotrophic (north of HBF) to mesotrophic (south of HBF), with relatively low to moderate nutrient levels and generally good water quality, although localised pressures such as agriculture and tourism can contribute to nutrient enrichment.
The loch contains many islands, including Inchmurrin, the largest fresh-water island in the British Isles. Loch Lomond is a popular leisure destination and is featured in the song "The Bonnie Banks o' Loch Lomond". The loch is surrounded by hills, including Ben Lomond on the eastern shore, which is 974 metres (3,196 ft) in height and the most southerly of the Scottish Munro peaks. A 2005 poll of Radio Times readers voted Loch Lomond as the sixth greatest natural wonder in Britain.
Loch Lomond takes its name from the highest peak in the area, Ben Lomond, Scottish Gaelic: Beinn Laomainn, meaning ‘beacon mountain’ i.e. a site for warning beacons. However, the region in which the loch is located is Scottish Gaelic: Leamhnachd anglicised as Lennox and Loch Lomond "was of old Loch Leamhna" after the River Leven which means ‘elm water’ in Gaelic.
The depression in which Loch Lomond lies was carved out by glaciers during the retreat of the last ice age, during a temporary return to glacial conditions known as the Younger Dryas. Locally this is known as the Loch Lomond Readvance, between 20,000 and 10,000 years ago. The hydrology and structure of the loch are strongly influenced by its glacial origins and underlying geology. Formed during the last glaciation, the loch occupies a classic glacial trough, carved by ice movement from the Ben Lui region. The loch lies on the HBF, and the difference between the Highland and Lowland geology is reflected in the shape and character of the loch: in the north the glaciers dug a deep channel in the Highland schist, removing up to 600 m of bedrock to create a narrow, fjord-like finger lake.This area is underlain by ancient Precambrian and Cambrian schists and quartzites, which contributed to the formation of the deep and narrow northern basin, reaching depths of up to 190 metres . Further south the glaciers were able to spread across the softer Lowland sandstone, leading to a wider body of water that is rarely more than 30 m deep. The southern part of the loch features younger Devonian sandstones and volcanic rocks, especially near the Campsie Fells, resulting in a broad, shallow basin. In the period following the Loch Lomond Readvance the sea level rose, and for several periods Loch Lomond was connected to the sea, with shorelines identified at 13, 12 and 9 metres above sea level (the current loch lies at 8 m above sea level).
The change in rock type can be clearly seen at points around the loch, as it runs across the islands of Inchmurrin, Creinch, Torrinch and Inchcailloch and over the ridge of Conic Hill. The loch's shape and many of its islands follow the line of the HBF separates the ancient metamorphic rocks of the Highlands from the younger sedimentary rocks of the Lowlands. To the south lie green fields and cultivated land; to the north, mountains.
Loch Lomond has a catchment area of approximately 781 square kilometres. The primary inflows include the River Falloch in the north, the Endrick Water in the southeast, and the Fruin Water, along with numerous smaller streams. The loch drains southward via its sole outflow, the River Leven, which eventually joins the River Clyde at Dumbarton. With a relatively short water residence time of approximately 1.9 years, Loch Lomond is a dynamic freshwater system shaped by both climatic and geological forces.
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Loch Lomond
Loch Lomond (/ˈlɒx ˈloʊmənd/; Scottish Gaelic: Loch Laomainn) is a freshwater Scottish loch which crosses the Highland Boundary Fault (HBF), often considered the boundary between the lowlands of Central Scotland and the Highlands. Traditionally forming part of the boundary between the counties of Stirlingshire and Dunbartonshire, Loch Lomond is split between the council areas of Stirling, Argyll and Bute and West Dunbartonshire. Its southern shores are about 23 kilometres (14 mi) northwest of the centre of Glasgow, Scotland's largest city. The Loch forms part of the Loch Lomond and The Trossachs National Park which was established in 2002. From a limnological perspective, Loch Lomond is classified as a dimictic lake, meaning it typically undergoes two mixing periods each year. This occurs in the spring and autumn when the water column becomes uniformly mixed due to temperature-driven density changes
Loch Lomond is 36.4 kilometres (22.6 mi) long and between one and eight kilometres (1⁄2–5 miles) wide, with a surface area of 71 km2 (27.5 sq mi). It is the largest lake in Great Britain by surface area; in the United Kingdom, it is surpassed only by Lough Neagh and Lough Erne in Northern Ireland. In the British Isles as a whole there are several larger loughs in the Republic of Ireland. The loch has a maximum depth of about 190 metres (620 ft) in the deeper northern portion, although the southern part of the loch rarely exceeds 30 metres (98 ft) in depth. The total volume of Loch Lomond is 2.6 km3 (0.62 cu mi), making it the second largest lake in Great Britain, after Loch Ness, by water volume.Due to its considerable depth and latitudinal location, Loch Lomond exhibits thermal stratification during the summer months, with a distinct epilimnion, metalimnion, and hypolimnion forming in deeper areas. These stratification patterns have important implications for nutrient cycling and aquatic ecology within the loch. During periods of stratification, a decrease in hypolimnetic oxygen can occur in the deeper northern basin, which can affect the species distribution patterns.
Loch Lomond is considered oligotrophic (north of HBF) to mesotrophic (south of HBF), with relatively low to moderate nutrient levels and generally good water quality, although localised pressures such as agriculture and tourism can contribute to nutrient enrichment.
The loch contains many islands, including Inchmurrin, the largest fresh-water island in the British Isles. Loch Lomond is a popular leisure destination and is featured in the song "The Bonnie Banks o' Loch Lomond". The loch is surrounded by hills, including Ben Lomond on the eastern shore, which is 974 metres (3,196 ft) in height and the most southerly of the Scottish Munro peaks. A 2005 poll of Radio Times readers voted Loch Lomond as the sixth greatest natural wonder in Britain.
Loch Lomond takes its name from the highest peak in the area, Ben Lomond, Scottish Gaelic: Beinn Laomainn, meaning ‘beacon mountain’ i.e. a site for warning beacons. However, the region in which the loch is located is Scottish Gaelic: Leamhnachd anglicised as Lennox and Loch Lomond "was of old Loch Leamhna" after the River Leven which means ‘elm water’ in Gaelic.
The depression in which Loch Lomond lies was carved out by glaciers during the retreat of the last ice age, during a temporary return to glacial conditions known as the Younger Dryas. Locally this is known as the Loch Lomond Readvance, between 20,000 and 10,000 years ago. The hydrology and structure of the loch are strongly influenced by its glacial origins and underlying geology. Formed during the last glaciation, the loch occupies a classic glacial trough, carved by ice movement from the Ben Lui region. The loch lies on the HBF, and the difference between the Highland and Lowland geology is reflected in the shape and character of the loch: in the north the glaciers dug a deep channel in the Highland schist, removing up to 600 m of bedrock to create a narrow, fjord-like finger lake.This area is underlain by ancient Precambrian and Cambrian schists and quartzites, which contributed to the formation of the deep and narrow northern basin, reaching depths of up to 190 metres . Further south the glaciers were able to spread across the softer Lowland sandstone, leading to a wider body of water that is rarely more than 30 m deep. The southern part of the loch features younger Devonian sandstones and volcanic rocks, especially near the Campsie Fells, resulting in a broad, shallow basin. In the period following the Loch Lomond Readvance the sea level rose, and for several periods Loch Lomond was connected to the sea, with shorelines identified at 13, 12 and 9 metres above sea level (the current loch lies at 8 m above sea level).
The change in rock type can be clearly seen at points around the loch, as it runs across the islands of Inchmurrin, Creinch, Torrinch and Inchcailloch and over the ridge of Conic Hill. The loch's shape and many of its islands follow the line of the HBF separates the ancient metamorphic rocks of the Highlands from the younger sedimentary rocks of the Lowlands. To the south lie green fields and cultivated land; to the north, mountains.
Loch Lomond has a catchment area of approximately 781 square kilometres. The primary inflows include the River Falloch in the north, the Endrick Water in the southeast, and the Fruin Water, along with numerous smaller streams. The loch drains southward via its sole outflow, the River Leven, which eventually joins the River Clyde at Dumbarton. With a relatively short water residence time of approximately 1.9 years, Loch Lomond is a dynamic freshwater system shaped by both climatic and geological forces.