भिडियो हेर्न तल को बक्समा क्लिक गर्नुहोस

The first sign of trouble for residents along the upper Seti River in Nepal was the water. In late April and early May 2012, what was usually a roaring river had slowed to a trickle. And the milky-white water—colored by rock flour from glaciers upstream in the Sabche Cirque—had turned blue and clear.

Residents regarded the river changes as bizarre, but nobody connected the slowdown to anything dangerous upstream. So it came as a surprise when a slurry of sediment, rock, and water suddenly surged through the valley on May 5, 2012, obliterating dozens of homes and sweeping 72 people to their deaths. In the chaotic aftermath of the flood, questions swirled about where the water had come from and how it had arrived with so little warning.

Had a natural dam formed and then abruptly burst? Had debris from a rockslide dammed the Seti into a glacial lake and then failed? Had water long trapped in subterranean caves found its way out? Did an avalanche high on Annapurna triggered the deluge? “There were all sorts of theories in the beginning, but they were mostly speculation,” said Jeffrey Kargel, a University of Arizona hydrologist who has been studying the disaster. “We didn’t have hard data from the field that could prove or disprove most of them.”

Now they have that data. Twenty months after the disaster, experts like Kargel have made enough observations in the field, conducted enough tests in the lab, and analyzed enough satellite data to say quite definitely what happened. He has concluded that it was not just one event but a series of them that combined to produce the devastation.

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तल को बक्समा क्लिक गर्नुहोस

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