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Archive for October 8th, 2009

Mouth of the Amazon River, Brazil

1.6N 49.9W

October 8th, 2009 Category: Rivers

Brazil - July 28th, 2009

Brazil - July 28th, 2009

The Amazon River of South America is the largest river in the world by volume and has the world’s largest drainage basin. Here, it can be seen flowing through the Brazilian rainforest to its mouth, carrying an immense load of sediments into the ocean.

The Amazon estuary is some 330 kilometres (210 mi) wide. The width of the mouth of the river is usually measured from Cabo do Norte to Punto Patijoca. This means that the Amazon is wider at its mouth than the entire length of the Thames in England.

Following the coast, a little to the north of Cabo do Norte, and for 160 kilometres (99 mi) along its Guiana margin up the Amazon, is a belt of half-submerged islands and shallow sandbanks.

Here the tidal phenomenon called the bore, or pororoca, occurs, where the depths are not over 7 metres (23 ft). The tidal bore starts with a roar, constantly increasing, and advances at the rate of from 15–25 km/h (9–16 mph), with a breaking wall of water from 1.5–4.0-metres (5–13 ft) high.

The bore is the reason the Amazon does not have a protruding delta; the ocean rapidly carries away the vast volume of silt carried by the Amazon, making it impossible for a delta to grow past the shoreline.

The Grand Valley Below the Rocky Mountains, Colorado, USA

39.0N 108.5W

October 8th, 2009 Category: Rivers

USA - September 6th, 2009

USA - September 6th, 2009

The Grand Valley is an extended populated valley, approximately 30 miles (48 km) long and 5 miles (8 km) wide, located along the Colorado River in Mesa County in western Colorado and Grand County, Utah, USA. It appears as a flat, dark grey area at the bottom of this orthorectified image of Colorado.

The valley contains the city of Grand Junction, as well as other smaller communities, and is the most densely populated area on the Colorado Western Slope. such as Fruita, Orchard Mesa, and Palisade. The valley is noted as a major fruit growing region, with a large number of orchards.

North of the valley, the Rocky Mountains rise to great heights. Those above the valley in the middle section of the image reach altitudes of over 8500 feet, while the parallel ridges of those towards the top are lower, at around 7500 feet.

The Port of Antwerp and the Scheldt River, Belgium and the Netherlands

51.2N 4.3E

October 8th, 2009 Category: Rivers

Netherlands - August 31st, 2009

Netherlands - August 31st, 2009

This image focuses on the Dutch province of Zeeland, with the terrain of southwestern Netherlands and northwestern Belgium visible inland. Zeeland consists of a number of islands and a strip bordering Belgium.

The entire province of Zeeland is a large river delta situated at the mouth of several major rivers. Here, large quantities of sediments are being spilled into the North Sea from the Scheldt, a 350 km long river that runs from northern France, through western Belgium and across southwestern part of the Netherlands.

Following the Scheldt inland just beyond the beginning of the estuary, the city of Antwerp, Belgium, can be seen. The metropolitan area, including the outer commuter zone, covers an area of 1,449 km2 (559 sq mi) with a total of 1,190,769 inhabitants as of 2008. The port area of the city appears as a series of dark blue lines surrounded by the tan and grey of urban constructions.

Sand Dunes Near Qinghai Lake and Longyang Xia Reservoir, China – October 8th, 2009

36.7N 100.2E

October 8th, 2009 Category: Image of the day, Lakes, Rivers

China - August 31st, 2009

China - August 31st, 2009

The large, saline Qinghai Lake (upper left) is situated to the northwest of the smaller, curved Longyang Xia Reservoir, both in the province of Qinghai, China.

While the former is a natural lake located at 3,205 m (10,515 feet) above sea level in a depression of the Tibetan Plateau, the latter is artificial, created by a dam on the Huang He (Yellow River).

The golden tan area southeast of the reservoir is a large field of sand dunes, surrounded by agriculture despite the aridity of the region.