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Haze Over Yangtze River Delta and van Kármán Vortex Streets by Jeju Island, China and Korea – February 18th, 2013

33.4N 126.5E

February 18th, 2013 Category: Clouds, Image of the day, Sediments

China – January 28th, 2013

Haze hangs over northeastern China, particularly over the plains by the Yangtze River Delta. The delta comprises the triangular-shaped territory of Wu-speaking Shanghai, southern Jiangsu province and northern Zhejiang province of China, by where the Yangtze River drains into the East China Sea.

The urban build-up in the area has given rise what may be the largest concentration of adjacent metropolitan areas in the world. It covers an area of 99600 km2 and is home to over 105 million people as of 2010, of which an estimated 80 million is urban.

Visible to the east, offshore, is the island and Korean province of Jeju, south of the Korean Peninsula (upper right quadrant). Streaming off the island to the south are Van Kármán vortex streets, a repeating pattern of swirling vortices caused by the unsteady separation of flow of a fluid around blunt bodies (in this case, the island of Jeju).

Thick Smoke Obscures Yangtze River Delta, China – January 2nd, 2011

31.2N 121.4E

January 2nd, 2011 Category: Fires, Rivers

China - December 27th, 2010

The thick sediments in the Yangtze River Delta near the city of Shanghai, are barely visible due to a thick veil of smoke sweeping across eastern China and over the coast.

These fires may be agricultural in origina, as most of China’s arable lands lie along the Huang He and Yangtze Rivers. In the east, along the shores of the Yellow Sea and the East China Sea there are extensive and densely populated alluvial plains.

Sediments from Yangtze and Qiantang Rivers in China – April 5th, 2011

30.2N 120.1E

April 5th, 2011 Category: Image of the day, Lakes, Rivers, Sediments

China - March 30th, 2011

Sediments from the Yangtze (above) and Qiantang (below) Rivers flow into the East China Sea near Shanghai. The large bay at the mouth of the latter is Hangzhou Bay.

The rivers release a dense load of sediments that color the sea waters opaque tan. Further east, the sediments take on a greenish paisley pattern as they follow the currents and mix with the ocean water.

To the west, near the left edge of the image, is Taihu Lake (literally “Grand Lake”), is a large lake in the Yangtze Delta plain. With an area of 2,250 km² and an average depth of 2 metres, it is the third largest freshwater lake in China.


Hongze and Tainhu Lakes Near Yangtze River, China

33.2N 118.5E

February 1st, 2011 Category: Lakes, Rivers

China - January 16th, 2011

Several colorful greenish-yellow lakes dot the landscape near the Yangtze River and Shanghai, China. The largest two are Hongze Lake (north of the river, irregularly shaped) and Taihu Lake (south of the river, curved lower shoreline).

Hongze Lake is located in Jiangsu Province, China and is encompassed by the cities Suqian and Huai’an. Lake Hongze is the fourth largest freshwater lake in China.

Taihu Lake is a large lake in the Yangtze Delta plain, on the border of the Jiangsu and Zhejiang provinces. With an area of 2,250 km² and an average depth of 2 metres, it is the third largest freshwater lake in China.

Also of note in the lower right corner is the brown, sediment-laden Hangzhou Bay, an inlet of the East China Sea. It is bordered by the province of Zhejiang and the municipality of Shanghai. The Qiantang River flows into the bay.

Thick Outflow of Sediments from Yangtze and Han Rivers

38.9N 120.0E

November 12th, 2009 Category: Rivers

China and South Korea - October 21st, 2009

China and South Korea - October 21st, 2009

Sediments line the northeast coast of China and the west coast of the Korean Peninsula, clouding the waters of the Bohai Sea (upper left quadrant) and framing the Shandong Peninsula.

In China, the greatest outflow is coming from the Yangtze River. These sediments spill into the East China Sea near Shanghai on the Yangtze River Delta, appearing concentrated and brown near the coast and spreading outwards in a still thick, greenish plume.

Across the sea by Korea, the discharge of sediments is strongest from the Han River in South Korea. The Han is a major river, formed by the confluence of the Namhan River (South Han River) and the Bukhan River (North Han River). The Han flows through Seoul and then merges with the Imjin River shortly before it flows into the Yellow Sea.