The three Gorges reservoir. Surging materials
"In 2010 and 2012 were regional floods, not too large, it can be said no big flood in front, especially in basin-wide flood. "Three Gorges pivot Wang Hai, Director of operations of the group recently surging journal (www.thepaper.CN), said in an interview, basin-wide flood forecast in June-August likely, could face biggest test since the completion of the three Gorges reservoir.
Under the background of anti-flood this year, conveniently located in Yichang, Hubei Province, the three Gorges reservoir area of concern. According to the official reply of Ministry of water resources of the three gorges project scheduling procedures, priority in the three Gorges reservoir for flood control.
"To respond to a potential flood our drawdown plans a little faster than usual this year, water levels in the reservoir area in the same period one or two meters lower than in previous years. "Wang emphasized that even with the 1998 flood," we believe that the flood control role and have the confidence to play. "
According to the news of the three gorges Corporation official website on June 12, June 5, at 14 o'clock, fluctuating water level of three Gorges reservoir to 145.79 metres, before flood season has 5 days to complete the drawdown plan in advance. Water accumulated in the reservoir drawdown 28.77 meters, fluctuating 21.31 billion cubic meters of water, to prepare against possible flood.
Water table shows in real time of the Yangtze River Water Conservancy Committee, June 12, at 20 o'clock, 145.33 meters of water level of three Gorges reservoir and flows greater than the inflow, water levels are still lower.
This year, according to "the big flood regulation scheme"
Located in Yichang city, Hubei Province, the three Gorges reservoir, which is the world's largest water control project, is considered in the Yangtze River basin flood control system for the "salt fortress".
Control watershed of three Gorges reservoir area is about 1 million square kilometers, the flood control capacity of 22.15 billion cubic meters, now with a 175-meter water level in normal operating conditions.
Executive Deputy Director of the flood control of the Yangtze River, the Yangtze, Director Liu Yaming recently stressed that current basin of the Yangtze River have entered the main flood season in late June also will usher in the rainy season, the Yangtze River flood control work in a crucial period. A core of three Gorges reservoir joint regulation of reservoir group in the upper reaches of both emphasis and difficulty, to flood control in the first place, integrated power shipping and so on.
On May 12, three gorges Group Hub Operations Department director Wang surging news that three gorges there are flood control, power generation, navigation, water supply, ecological benefits, but the comprehensive benefit of flood control is one of the biggest, "always in the first place."
He said three gorges group is a State-owned enterprises, implementation of dispatching order issued by the State flood control Department. Every year before flood season preparation of flood regulation scheme of the Group of the three gorges, Yangtze flood control approval. Reported in the programme in April this year, "we did it as a programme of a possible larger flood forecasting flood may be greater than in 1998. "
Wang told the word news, under the influence of the El Nino events in January-April of this year the three gorges water 50% more than the average over the same period in previous years, basin-wide flood forecast in June-August likely, could face biggest test since the completion of the three Gorges reservoir.
News from the Ministry of water resources, and early in 2010, has just completed the three Gorges reservoir has had them tested: peak more than a year that 1998 peak maximum, peak of 70,000 cubic meters per second were three Gorges reservoir firmly stopped, only 40,000 cubic meters per second of flow "light" out of the library. In 1998 to defend in 2010, an easy ride.
But in the eyes of Wang Hai, floods in 2010 and 2012 are not tested for three gorges. Since the completion of the three gorges flood 2010 year of 70000 cubic metres per second and 2012 71200 cubic meters per second, this flow is a flow, had little effect. "In 2010 and 2012 were regional floods, not too large, it can be said no big flood in front, especially in basin-wide flood. " Tao Chi rotation of United States military bases
Wang believes that basin-wide flood is likely to encounter this year, according to the three Gorges Dam design play a larger role, so as to avoid or reduce the diversion area use.
Released more than 20 billion cubic meters of flood control reservoir capacity
March 2016 meteorological and hydrological departments predicted that under the influence of strong El Niño events, meteorological year bias this year, there was a great flood in flood season more likely.
Under the national leadership's instructions, the Yangtze River flood control decisions from April 25 increased the discharge of three Gorges reservoir early drawdown, vacated capacity in order to meet the possibility of flooding as soon as possible.
The three Gorges reservoir began to increase since late April release, fluctuating water level. April 27, at 20 o'clock, out of the three Gorges reservoir flow 17000 cubic meters per second, for the recent peak, also set a record with moments of history.
Meanwhile, under the influence of regional heavy rainfall in the upper reaches of the Yangtze River, starting from the early hours of May 7, sustained and rapid traffic for the three Gorges reservoir rose to May 8, at 8 o'clock, 17800 cubic meters per second in 1992, since the implementation of this monitoring history record.
Since then, the record has been refreshed: May 10, at 2 o'clock, the three Gorges reservoir inflow 19500 cubic metres per second; June 2, at 14 o'clock, inflow up to 25000 cubic meters per second.
May 14, at 14 o'clock, the three Gorges reservoir drawdown in advance to 155 meters below, May 26, at 14 o'clock before falling to below 150 meters of the reservoir of the three gorges.
According to the three gorges Corporation official website news, June 5, at 14 o'clock, fluctuating water level of three Gorges reservoir to 145.79 m, get approved by the State flood control operating level during flood season, which marked the 5 days in advance before the completion of the flood in three Gorges reservoir drawdown plan. Water accumulated in the reservoir drawdown 28.77 meters, fluctuating 21.31 billion cubic meters of water, to prepare against possible flood.
And once the water level of three Gorges reservoir drawdown to 145 m, will free up 22.15 billion cubic meters of flood control reservoir capacity.
Wang introduced, compared to previous years, the three Gorges reservoir drawdown plan faster, reservoir water level to lower than the 1-2 in the same period, but the large inflow than in previous years, in January-April of this year to 50% more water than average over the same period in previous years.
Water table shows in real time of the Yangtze River Water Conservancy Committee, June 12, at 20 o'clock, 145.33 meters of water level of three Gorges reservoir, and outbound traffic is 16800 cubic meters per second, is greater than the inflow of 15500 cubic meters per second.
Super TGP thousand-year flood safety
Surging to the news of Wang Hai, now of major works of the three Gorges reservoir on the Yangtze River Jingjiang and the chenglingji section. Among them, the Jingjiang River is the Yangtze River from the city to Yueyang, Hunan province, Hubei Province, chenglingji section names, about 360 km in length.
In accordance with different levels of flood, flood control storage capacity of 22.15 billion cubic meters of reservoir of three gorges project was divided into three parts:
First, if the upper reaches of the three Gorges reservoir flood is unlikely, Jingjiang River also when you don't need the flood control capacity of the three gorges, chenglingji River when the flood occurred, the three Gorges reservoir to chenglingji flood control, the reservoir water level is applied to 155 meters, 5.65 billion cubic meters of flood control reservoir capacity.
The three Gorges reservoir.
Second is 155 meters above the water level of the three Gorges reservoir, only for the Jingjiang river flood control. Wang said that this ability from the Jingjiang river flood 10 years return up to a century. Shashi River near (of Jingjiang River) met-century flood, water can be applied to 171 meters in the reservoir of the three gorges.
Three is according to national anti-total 2011 reply of Yangtze River flood scheduling programme, met Centennial above thousand years a met of flood, three Gorges reservoir level in 171-175 meters Shi, including 1870 equal big of flood Shi, three Gorges reservoir can control zhicheng station flow not is greater than 80000 cubic metres each seconds, and tie storage flood using, guarantee Jingjiang River line Hong security, control Shashi level not Super 45 meters design level.
"Met more than a thousand years and years of floods, if using reservoir water level to 175 meters, we three gorges project security. "Wang introduced, if the upstream of the three Gorges reservoir hit the limit has been hair to flood control level, for the safety of three Gorges reservoir," how much water in the upper reaches, how much water do we put ".
Wang said, don't worry about safety of the three gorges project itself, the flood control capacity of the three gorges project itself is perpetual and 10%, the hub itself is no problem.
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