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Water is clearer and clearer whether to affect health of the Yangtse River
From;  Author:Stand originally
"2007, trunk stream of the Yangtse River stands each quantity is defeated by sand slants than old average little 3 to 9 into. "

Committee of committee of irrigation works of the Yangtse River just releases 2007 " bulletin of silt of the Yangtse River " show, 2007, trunk stream of the Yangtse River encounters once more " low water little sand " year.

The Yangtse River is maternal river of China, her health and our life be closely bound up. The data shows, from 20 centuries since 90 time, catchment of the Yangtse River is defeated by sanded quantity to decrease, water of the Yangtse River is clearer and clearer, why can you appear such phenomenon? Is healthy? The reporter interviewed the relevant expert of committee of irrigation works of the Yangtse River at this point.

Lu Jinyou of assistant dean of academy of sciences of vice director of council of major of silt of society of Chinese irrigation works, the Yangtse River says, the investment of 3 gorge reservoir that gets attention fully moves, not be to bring about the Yangtse River to be defeated by sand to measure reductive only factor. The downstream silt quantity in beginning the 3 gorge reservoir that move to bar sand is opposite only 2003 produces an effect, and upper reaches of the Yangtse River is defeated by sanded quantity to decrease from 20 centuries 90 time already showed clue.

The Yangtse River is defeated by sanded quantitative change to change the effect that suffers a lot of elements. He introduces, jiang Shui has nip sanded capacity, usually, be defeated to sand is measured and come water estimates direct ratio. But data statistic, arrive from 1990 2005, the station of very little beach of upper reaches of the Yangtse River comes water is measured relatively old average decreases before its only 2.4% , quantity is defeated by sand reduced 1/3 however.

Lu Jinyou explains, this and area of upper reaches of the Yangtse River build hydroelectric station to concern in great quantities, these reservoir intercept upper reaches of the Yangtse River is many silt.

Next, project of water and soil conservation of catchment of the Yangtse River reduced catchment soil erode and change dene, the silt that flows into the Yangtse River decreases in great quantities. In addition, go up century since 90 time, upper reaches of the Yangtse River advocate rainfall of area yield sand and rainfall strength are not great, strength yield sand is not great, decreased to collect the silt amount of the Yangtse River. The amount is defeated by sand that because wadi collects the other reason such as arenaceous aggravate to cause,still has decreases occupy the 1/8 left and right sides that reduces gross.

Does in recent years silt of the Yangtse River reduce extent after all to have how old? The Yangtse River appoint Chen Shourong of section chief of hydrology bureau technical divisions takes out a group of such data: From 2000 the Yangtse River appoint since beginning bulletin of work out silt, the amount is defeated by sand that the Yangtse River knows hydrometric station greatly into big talk is respectively 2000 339 million tons, 2001 276 million tons, 2002 275 million tons, 2003 206 million tons, 2004 147 million tons, 2005 216 million tons, 2006 84.8 million tons, 2007 138 million tons. With old average 436 million tons of photographs are compared, the quantity is defeated by sand of these year all is having very big difference.
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