Hydrological Collection

Woodland river. This is the East Lyn river, which flows through Exmoor National Park. Photographed near Rockford, Somerset, UK

Measuring water levels
Water level recorder in a river, being adjusted by a scientist. It uses float activation of a gearing assembly to move a pen across a chart drum. The chart drum is driven by a spring-wound clock

The eternal vicissitudes of a dewdrop (colour litho)
3099283 The eternal vicissitudes of a dewdrop (colour litho) by French School, (19th century); Private Collection; (add.info.: The eternal vicissitudes of a dewdrop)

Nilometer in Egypt, 17th-century artwork C016 / 8926
Nilometer in Egypt. 17th-century artwork titled Nilometrium, showing a nilometer as used in Ancient Egypt. The central column is labelled in cubits to show the height of the water during the annual

Ice formations C013 / 6070
Ice formations. Ice stalagmites and icicles forming on a rocky surface. Photographed in winter near the banks of the river Rhine, at Eglisau, Switzerland

San Juan River, USA C018 / 1812
San Juan River. Panoramic view of the San Juan River meandering through Gooseneck State Park, Utah, USA

Langebaan Lagoon, South Africa C017 / 1925
Langebaan Lagoon. Aerial view over the Langebaan Lagoon and salt marshes of the West Coast National Park, Western Cape, South Africa. The shoreline is at left

Langebaan Lagoon, South Africa C017 / 1924
Langebaan Lagoon. Aerial view over the Langebaan Lagoon and salt marshes of the West Coast National Park, Western Cape, South Africa

Sea surface salinity, Aquarius image C017 / 6816
Sea surface salinity, Aquarius image. Computer model showing the salinity (dissolved salt-content) of the Atlantic Ocean, based on information recorded by the Aquarius spacecraft from December 2011

Iguazu Falls, Argentina F008 / 4424
Iguazu falls, Argentina. Iguazu Falls, named after the Guarani word for great water, are four times the width of Niagara Falls and are divided by islands into 274 separate waterfalls

Iguazu Falls, Argentina F008 / 4412
Iguazu falls, Argentina. Iguazu Falls, named after the Guarani word for great water, are four times the width of Niagara Falls and are divided by islands into 274 separate waterfalls

Devils Throat, Iguazu Falls, Argentina F008 / 4425
Devils Throat, Iguazu Falls. Iguazu Falls, named after the Guarani word for great water, are four times the width of Niagara Falls and are divided by islands into 274 separate waterfalls

Iguazu Falls, Argentina F008 / 4415
Iguazu falls, Argentina. Iguazu Falls, named after the Guarani word for great water, are four times the width of Niagara Falls and are divided by islands into 274 separate waterfalls

Iguazu Falls, Argentina F008 / 4413
Iguazu falls, Argentina. Iguazu Falls, named after the Guarani word for great water, are four times the width of Niagara Falls and are divided by islands into 274 separate waterfalls

Iguazu Falls, Argentina F008 / 4419
Iguazu falls, Argentina. Iguazu Falls, named after the Guarani word for great water, are four times the width of Niagara Falls and are divided by islands into 274 separate waterfalls

Iguazu Falls, Argentina F008 / 4417
Iguazu falls, Argentina. Iguazu Falls, named after the Guarani word for great water, are four times the width of Niagara Falls and are divided by islands into 274 separate waterfalls

Iguazu Falls, aerial view, Argentina F008 / 4423
Aerial view of the Iguazu falls, Argentina. Iguazu Falls, named after the Guarani word for great water, are four times the width of Niagara Falls

Iguazu Falls, aerial view, Argentina F008 / 4421
Aerial view of the Iguazu falls, Argentina. Iguazu Falls, named after the Guarani word for great water, are four times the width of Niagara Falls

Great egret at Iguazu Falls, Argentina F008 / 4416
Great egret (Ardea alba). This large wading bird uses it long beak to spear fish at Iguazu falls, Argentina. Iguazu Falls, named after the Guarani word for great water

Iguazu Falls, Argentina F008 / 4414
Iguazu falls, Argentina. Iguazu Falls, named after the Guarani word for great water, are four times the width of Niagara Falls and are divided by islands into 274 separate waterfalls

Iguazu Falls, Argentina F008 / 4420
Iguazu falls, Argentina. Iguazu Falls, named after the Guarani word for great water, are four times the width of Niagara Falls and are divided by islands into 274 separate waterfalls

Iguazu River, directly above Iguazu Falls F008 / 4422
Aerial view of the Iguazu River, directly above the Iguazu Falls. The River is located in southern Brazil and northeastern Argentina

Sea surface salinity, Aquarius image C017 / 6820
Sea surface salinity, Aquarius image. Computer model showing the salinity (dissolved salt-content) of the oceans around Africa

Columbia Glacier, Alaska, 1989
Columbia Glacier, Alaska. False-colour satellite image of the Columbia Glacier, Alaska, USA, taken in 1989. Columbia Glacier descends from an ice field (top) 3, 050 metres above sea level

Water cycle, artwork C017 / 7380
Water cycle, artwork. The natural water cycle (or hydrologic cycle) describes the continuous movement (arrows) of water on, above and below the surface of the Earth

Water cycle, artwork C017 / 7382
Water cycle, artwork. The natural water cycle (or hydrologic cycle) describes the continuous movement (arrows) of water on, above and below the surface of the Earth

North Atlantic ocean currents, artwork C016 / 7694
North Atlantic ocean currents. Computer artwork showing the main ocean currents in the North Atlantic, and extending in to the Arctic Ocean (top). Warm currents are red and cold currents are blue

Manambolo River, Madagascar
Manambolo River. View of storm clouds gathering over the Manambolo River, Madagascar. This river originates in the highlands of Madagascar, about 130 km west of the capital city Antananarivo

Sea surface salinity, Aquarius image C017 / 6817
Sea surface salinity, Aquarius image. Computer model showing the salinity (dissolved salt-content) of the Atlantic and Pacific oceans

Sea surface salinity, Aquarius image C017 / 6819
Sea surface salinity, Aquarius image. Computer model showing the salinity (dissolved salt-content) of the Western Pacific Ocean

Tiputini River, Ecuador C014 / 0961
Tiputini River. View over the Tiputini River flowing through the Amazon Rainforest, Ecuador. The Tiputini River is a tributary of the Napo River, which is itself a tributary of the Amazon

Dead Sea, 2011 satellite image C014 / 4705
Dead Sea. False-colour satellite image of the Dead Sea. North is at top. Deep waters are blue or dark blue, while brighter blues indicate shallow waters or salt ponds (in the south)

Columbia Glacier, Alaska, 1986
Columbia Glacier, Alaska. False-colour satellite image of the Columbia Glacier, Alaska, USA, taken in 1986. Columbia Glacier descends from an ice field (top) 3, 050 metres above sea level

Dead Sea, 1972 satellite image C014 / 4706
Dead Sea. False-colour satellite image of the Dead Sea. North is at top. Deep waters are blue or dark blue, while brighter blues indicate shallow waters or salt ponds (in the south)

Columbia Glacier, Alaska, 2000
Columbia Glacier, Alaska. False-colour satellite image of the Columbia Glacier, Alaska, USA, taken in 2000. Columbia Glacier descends from an ice field (top) 3, 050 metres above sea level

Columbia Glacier, Alaska, 2011
Columbia Glacier, Alaska. False-colour satellite image of the Columbia Glacier, Alaska, USA, taken in 2011. Columbia Glacier descends from an ice field (top) 3, 050 metres above sea level

Columbia Glacier, Alaska, 2003
Columbia Glacier, Alaska. False-colour satellite image of the Columbia Glacier, Alaska, USA, taken in 2003. Columbia Glacier descends from an ice field (top) 3, 050 metres above sea level

Dead Sea, 1989 satellite image C014 / 4707
Dead Sea. False-colour satellite image of the Dead Sea. North is at top. Deep waters are blue or dark blue, while brighter blues indicate shallow waters or salt ponds (in the south)

Rio Latas Waterfall, Ecuador C016 / 8422
Rio Latas Waterfall. View of the Rio Latas river cascading over limestone rocks at a waterfall in the Hollin Formation, near Misahualli, Amazon Rainforest, Ecuador

Global surface currents 2005-2007 C016 / 8120
Global surface currents 2005-2007. Computer visualisation showing ocean surface currents ff the coast of Asia, during the period from June 2005 to December 2007

Global surface currents 2005-2007 C016 / 8119
Global surface currents 2005-2007. Computer visualisation showing ocean surface currents around the tip of southern Africa, during the period from June 2005 to December 2007

Thermohaline circulation, artwork C016 / 8121
Thermohaline circulation. Computer artwork showing all 3 layers (shallow, middle and deep) of the large slow global currents driven by thermohaline circulation

Thermohaline circulation, artwork C016 / 8122
Thermohaline circulation. Computer artwork showing the large slow global currents (dotted line) driven by thermohaline circulation in the North Atlantic (upper right) and eastern Pacific (lower left)

Global surface currents 2005-2007 C016 / 8115
Earth surface currents 2005-2007. Computer visualisation showing ocean surface currents around the world during the period from June 2005 to December 2007

Global surface currents 2005-2007 C016 / 8118
Global surface currents 2005-2007. Computer visualisation showing ocean surface currents around North and Central America, centred on the Caribbean Sea and Atlantic Ocean

Global surface currents 2005-2007 C016 / 8117
Global surface currents 2005-2007. Computer visualisation showing ocean surface currents around the world, centred on the Pacific Ocean, during the period from June 2005 to December 2007

Global surface currents 2005-2007 C016 / 8116
Global surface currents 2005-2007. Computer visualisation showing ocean surface currents around the world, centred on the Indian Ocean, during the period from June 2005 to December 2007

Rogue wave, artwork
Rogue wave. Computer artwork showing an ocean liner and a rogue wave during a storm. Rogue waves are relatively large and spontaneous ocean surface waves that occur far out at sea

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"Exploring the Hydrological Wonders: From Woodland Rivers to Iguazu Falls" A serene woodland river flows gracefully, showcasing the beauty wonders. Measuring water levels becomes a crucial task in understanding the hydrological dynamics of our planet. "The eternal vicissitudes of a dewdrop" - a captivating color litho that symbolizes the ever-changing nature of water. Delicate ice formations mesmerize with their intricate patterns and reflect the power of hydrology (Ice formations C013 / 6070). San Juan River, USA - an emblematic example of how rivers shape landscapes and influence ecosystems (C018 / 1812). Langebaan Lagoon, South Africa - a stunning coastal feature shaped by complex hydrological processes (C017 / 1925). Witnessing the ebb and flow at Langebaan Lagoon reminds us of nature's perpetual dance with water (C017 / 1924). Aquarius image reveals sea surface salinity variations, providing valuable insights into global hydrology (C017 / 6816). Stand in awe as Iguazu Falls roars with immense power, demonstrating nature's mastery over hydrological forces (F008 / 4424). The cascading waters at Iguazu Falls create breathtaking vistas that leave visitors spellbound (F008 / 4412). Dare to venture into Devil's Throat at Iguazu Falls for an up-close encounter with raw hydrometeorological might (F008/4425) Witnessing the majestic Iguazu Falls is an unforgettable experience that highlights Earth's remarkable hydrological diversity (F008/4415).