The Onyx River is a meltwater stream which flows westward through the Wright Valley from Wright Lower Glacier to Lake Vanda, during a few months of the Antarctic summer. It is the largest river in Antarctica, and at 12 miles in length, it is also the longest. It has several tributaries, and there is a meteorological station at the mouth of the river. Flow levels are highly variable, both during the day and between summers, with the river failing to reach the lake some years. In contrast, it can cause significant erosion in flood years, and was rafted in 1984 by New Zealand researchers. While there are no fish in Onyx River, it does support microscopic life, and the algal blooms can be quite extensive. The Wright Valley is one of several Dry Valleys in the Transantarctic Mountains, located west of McMurdo Sound at approximately 77°10′S 161°50′E. Wright Valley contains the Onyx River, the largest river in Antarctica, and Lake Vanda. ... Lake Vanda is a lake in Wright Valley, Victoria Land, Ross Dependency, Antarctica. ... Antarctica is a continent encompassing the southern extremity of Earth, and containing the Earths South Pole. ... A microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye). ... A red tide resulting from a dinoflagellate bloom discoloring the water on the right An algal bloom is a relatively rapid increase in the population of (usually) phytoplankton algae in an aquatic system. ...
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Of course, dredging the river is the ecological equivalent of strip mining the surface soils with the added detriment of killing fish directly without having to wait for a rain and sloppy run off to do the job.
The barges were sitting around the small pyramids of coal sand at all angles, jostled into their positions by spring time high waters and left for salvage by river rats who appreciated the thick oak slabs that made up the hulls.
The river has since recovered from that man made peril only have faced the next few decades of strip mining run-off which rendered it almost toxic in parts during the sixties and very early seventies.
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