HỒ THIÊN NHIÊN NHIỀU MÀU Ở SAN FRANCISCO

San Francisco's Incredible Stained Glass Salt Ponds

4 years ago Travel

Photo:Image by Jerry Ting
‘Art imitates life’ – or so the old saying goes – but when the reverse appears true, as Oscar Wilde noted, the effect can be all the more striking. The vivid hues of the San Francisco Bay salt ponds remind us more of a crafted stained glass window than the sea’s naturally muted colour palette, and they produce some of the world’s most magnificent natural colourways…
Photo:Image by apdonovan
The San Francisco Bay is a shallow bay surrounded by the cities of San Francisco, Oakland and San Jose, through which almost half the water of California is drained into the Pacific ocean. Home to the notorious Alcatraz prison, which housed among others Al Capone, the bay also contains a large number of salt evaporation ponds responsible for producing much of America’s industrial salt.
Photo:Image by webmink
The dramatic colours are produced by varying concentrations of algae, brine shrimp and other pond life, making the ponds appear as if they have been dyed. These micro-organisms change colour according to the salinity of their environment, thus the tint of each pond is an indication of its salinity. Low salinity ponds proliferate with green algae, but in high salinity ponds red algae are predominant. Millions of tiny brine shrimp can also cast an orange shade over ponds.
Photo:Image by KAP Cris
Unfortunately the salt ponds have recently been purchased by the state of California and will shortly be converted by the South Bay Restoration Project into a mixture of tidal marsh, mudflat and other wetland habitats. So, no longer will you be able to see these wonderful colours from the air on your way into San Francisco International – but at least the new project will provide a habitat for thousands of animals, right on the doorstep of one of the world's most famous cities.

Read more at http://www.environmentalgraffiti.com/featured/san-francisco-incredible-stained-glass-salt-ponds/14109#rKjbIdxBs2CoT8dr.99 

Pink Lake Hillier in Australia

HỒ THIÊN NHIÊN MÀU HỒNG CỦA ÚC CHÂU - THUỘC TIỂU BANG TÂY ÚC, PERTH - TRƯỚC KHI MÁY BAY ĐÁP XUỐNG PHI TRƯỜNG SAN FRANCISCO - NHÌN XUỐNG CŨNG THẤY CÓ MỘT HỒ NƯỚC MÀU HỒNG - TƯỞNG LÀ NHÂN TẠO - NHƯNG NAY MỚI RÕ LÀ Ở PERTH CŨNG CÓ MỘT HỒ TƯƠNG TỰ./- Mt68

Pink Lake Hillier in Australia

By Kaushik Monday, March 04, 2013  Australia, Travel  3 comments

Lake Hillier is a pink-colored lake on Middle Island, the largest of the islands and islets that make up the Recherche Archipelago, Western Australia. From above the lake appears a solid bubble gum pink. It is such a significant distinguishing feature of the archipelago that air passengers often crane their necks to take a glimpse of it.

The lake is about 600 meters long, and is surrounded by a rim of sand and a dense woodland of paperbark and eucalyptus trees. A narrow strip of sand dunes covered by vegetation separates it to the north from the Southern Ocean.

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Unlike other pink lakes in the world like the one in Retba and the salt ponds at San Francisco Bay, the pink color of Lake Hillier has not been decisively proved, although it is speculated that the color could arise from a dye created by the organisms Dunaliella salina and Halobacteria. Another hypothesis is that the pink color is due to red halophilic bacteria in the salt crusts. That the color is not a trick of light can be proved by taking water from the lake in a container – the pink color can be found to be permanent.

One of the first evidence of Middle Island's pink lake dates back to the journals of Matthew Flinders, a British navigator and hydrographer in 1802. Flinders had climbed Middle Island's highest peak (now known as Flinders Peak) to survey the surrounding waters when he came across this remarkable pink lake. Except for a few years when salt extraction was being carried out here, the island and its pink lake has been almost untouched and has since then provide visitors with one of the most amazing view of the world's natural wonder.

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