China's State flood control and drought relief Office of the Director: downstream of the three gorges project to alleviate stress plays a very important role
Beijing News News (reporters Wang Shuo) on July 14, the national flood control held a press conference, Commissioner of State Protection Office supervision, said Zhang Jiatuan said, see online a while ago and some false information, such as some netizens questioned "Wuhan was flooded, if the three gorges project didn't work? this could be downstream of netizens don't know and flood patterns. ”
According to the introduction, 1th flood peak formed mainly in three Gorges reservoir area this year, when the three Gorges reservoir inflow flood more than more than 50,000 cubic meters per second, maximum flow 31600 cubic meters per second, peak 36.8%. Between July 4 and 2 o'clock, appears the highest water level of three Gorges reservoir 151.57 meters, intercepting and storing flood at about 2.9 billion cubic metres, lower middle and lower reaches of the Yangtze River water level in Shashi station 1.35 meters.
Zhang Jiatuan said the second flood peak formed mainly in the middle and lower reaches of the Yangtze River, upstream of the three gorges, inflow was over more than 30,000 cubic meters per second at the three gorges, outbound traffic control at 20000 cubic meters per second, peak 30%, "it should be said that downstream of the three gorges project to alleviate pressure, plays a very important role."
According to the national flood control introduction, benefited from three gorges reduced flows affect, reduce the pressure on flood control of the Yangtze River, reducing the duration of the middle and lower reaches of the high water level of the Yangtze River, flood control and gain the initiative.
"The three gorges is the critical moment, the better they can embody the role. "National Defense Office said Huang Xianlong, Director of flood control, flood control effect of the three gorges mainly in two aspects, first of Jingjiang river flood control function. Key point of flood in Jingjiang, the three gorges of the flood control role of the first is the compensation regulation of Jingjiang River.
Says Huang Xianlong, Jingjiang river flood control capacity of three gorges project from the now ten-year increase to a century; when it encounters a thousand-year flood, with the application of Jingjiang, can ensure the Jingjiang levees are not devastating disasters.
The flood control role of the three gorges on the other hand, is mainly reflected in the imposed on Dongting Lake at chenglingji section compensation regulation for flood control. "This compensation is under certain conditions", said Huang Xianlong, when water upstream of the three gorges is not a lot, to use part of the flood control capacity of the three gorges, to compensate chenglingji scheduling. Schedule stipulated in the three Gorges reservoir between 145 to 155 m, about 5.6 billion cubic meters of flood control reservoir capacity, can be used in the chenglingji flood control in the area of compensation.
It is understood that this 5.6 billion cubic meters would add up to a capacity of Jingjiang.
(Editors: Zhong Qinghui UN660)
2016-07-14 20:20:21
The Beijing News
中国国家防汛抗旱总指挥办公室：三峡对缓解下游压力发挥了很大作用
新京报快讯(记者王硕)7月14日，国家防总召开新闻发布会，国家防办督察专员、新闻发言人张家团表示，前段时间看到网上有些不实信息，比如有网友质疑“武汉被淹，是不是三峡工程没发挥作用?这可能是网友没搞清楚上下游的关系和洪水的规律。”
据张家团介绍，今年1号洪峰主要在三峡库区形成，当时三峡入库洪峰流量50000多立方米每秒，最大出库流量31600立方米每秒，削峰36.8%。至7月4日2时，三峡水库出现最高库水位151.57米，拦蓄洪量约29亿立方米，降低长江中下游沙市站水位1.35米左右。
张家团说，第二次洪峰主要在长江中下游形成，三峡在上游，当时三峡入库流量是30000多立方米每秒，出库流量控制在20000立方米每秒，也削峰30%多，“应该说，三峡对缓解下游压力，发挥了很大作用”。
据国家防总介绍，受益于三峡减少出库流量影响，有效减轻了长江中下游防洪压力，减少长江中下游高水位持续时间，为防汛工作赢得主动。
“三峡是越到关键时刻，越能体现作用。”国家防办防汛一处处长黄先龙表示，三峡的防洪作用主要体现在两个方面，首先是对荆江河段的防洪作用。长江防洪的关键点在荆江河段，三峡防洪作用第一位的就是对荆江的补偿调度。
黄先龙说，三峡能够将荆江河段的防洪能力从现在的十年一遇提高到百年一遇;遇到千年一遇洪水时，配合荆江分洪区的运用，能够保证荆江大堤不发生毁灭性灾害。
三峡另一方面的防洪作用，主要体现在对洞庭湖城陵矶堤段实施防洪补偿调度。“这个补偿应用是有一定条件的”，黄先龙说，当三峡上游来水不是很多时，可以动用一部分三峡的防洪库容，来为城陵矶进行补偿调度。调度方案里规定，三峡水库在145米至155米之间，大概56亿立方米的防洪库容，可以用于对城陵矶地区的防洪补偿。
据了解，这56亿立方米相当于增加了一个荆江分洪区的库容。
(责任编辑：钟庆辉 UN660)
2016-07-14 20:20:21
新京报