The Mekong River Commission (MRC) said in a statement released on Monday that another reason could also be because of the presence of algae at the river bottom. The sections in Thailand’s northeastern province of Nakhon Phanom and Laos’ south-central town of Thakhek are now aquamarine, and the MRC said this could also be true of other parts of the river where low flows occur. The river flows through China, Myanmar, Laos, Thailand, Cambodia, and Vietnam, and the region is experiencing one of its worst droughts ever. The MRC has done a preliminary analysis of the causes and potential impacts of the phenomenon. The fine sediments normally found in the fast flowing river and the great depth that give it its usual brownish color are conspicuously absent, making the water clearer. This means that, when sunlight hits the river, the water absorbs what is known as the “long-wavelength colors” at the red end of the light spectrum and makes the river look blue. This occurs only if the water level is just a few meters. The clearer water in turn allows microscopic plants and algae to grow on the sand and bottom causing the margins of the river to turn… Read full this story
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