Go homepage(回首页) Upload pictures (上传图片) Write articles (发文字帖)
The author:(作者)delvpublished in(发表于) 2013/12/28 7:55:01 China three gorges University Scholars： TGP’s ecological regulation and remarkable achievements
CNS, Yichang, December 22 (reporter Xiang Yang)-"ecological regulation is the current large-scale ecological recovery of rivers and reservoirs in an important initiative, since its run of three gorges project, has taken a series of reservoir ecological operation of measures, the effect is very significant. 20th "sponsored by the media company of the three gorges project and environment seminar, the three gorges, said Ji Daobin, an associate professor at the University.
Ji Daobin believes that efficiency and results in ecological operation of three Gorges reservoir, mainly reflected in the promotion of the four fish breeding, dry season water and withstand saline water intrusion, reducing sediment and so on.
Four fish during the spawning season, through the application of scientific regulation of three Gorges reservoir, have continued to rise during the peak to promote four fish reproduce themselves by layingeggs. In 2011, the first for four fish were naturally bred ecological operation. In 2012, the implementation of ecological operation test twice, were found during the two scheduled four natural breeding of the fish.
Winter and spring dry season is the Yangtze River every year, by turning on water dispatching of three Gorges reservoir, effectively protect the middle and lower reaches of the Yangtze River provinces water for industrial and agricultural production and living, improve navigation conditions. As of 2012, have 6 years in a row of three Gorges reservoir for implementation of water and raw materials scheduling. From 2008 to the present, total water of three Gorges reservoir for middle and lower reaches of the Yangtze River nearly 50 billion cubic meters, equivalent to two of three Gorges reservoir capacity for flood control.
On sedimentation, the three Gorges reservoir, "storing clear water and releasing the muddy" operation, sediment and flood in large, flood protection to withstand capabilities, to lower the water level of three Gorges reservoir, so smoothly into larger flood of sediment downstream; after the flood, water water storage in stock to guarantee power generation and shipping. Impoundment for 10 years, average annual inflow sediment of three Gorges reservoir 60% per cent reduction compared to the preliminary design values, average annual sedimentation and sediment 42% to forecast values for the validation phase, sediment is clearly better than expected.
In addition, the Group has taken the library on deposition reduction schedule of the three gorges in China, through the timely increase in discharge, increase tailed river reservoir water velocity, fluctuating increase tailed sand ability, reduce sediment silting of the Chongqing section of the library.
Ji Daobin believes that improvement of salt tide invasion in Yangtze estuary, an important outcome of ecological regulation of three Gorges reservoir. "The Changjiang river mouth saltwater intrusion is tidal activities caused by persistence of natural phenomenon, generally occurs during the dry season from November to April. Research has shown that three gorges project on the improvement effect of the Changjiang river mouth saltwater intrusion situation is clear. If properly in dry years, impounding in advance, appropriate to increase the dry month of discharge, you can further increase the role of the three gorges project against salty tide invasion. "(The end)
(Original title: China three gorges University Scholars: TGP's ecological regulation and remarkable achievements)
中新网宜昌12月22日电 (向阳)“生态调度是当前大型河流和水库生态恢复的一项重要举措，三峡工程自运行以来，采取了一系列水库生态调度措施，效果十分显著。”20日在三峡传媒公司主办的三峡工程与生态环境研讨会上，三峡大学副教授纪道斌如是说。
纪道斌认为，三峡水库在生态调度方面的效益和成果，主要体现在促进四大家鱼繁殖、枯水期补水、减少泥沙淤积和抵御咸潮入侵等方面。
在四大家鱼产卵期，三峡水库通过实施科学调度，产生持续上涨的洪峰过程，促进四大家鱼产卵繁殖。2011年，首次开展了针对四大家鱼自然繁殖的生态调度。2012年，实施了两次生态调度试验，两调度过程中均发现了四大家鱼的自然繁殖现象。
每年冬春两季是长江枯水期，三峡水库通过启动补水调度，有效保障了长江中下游各省市工农业生产和居民生活用水，改善了通航条件。截至2012年，三峡水库已连续6年为下游实施补水调度。从2008年至今，三峡水库为长江中下游的补水总量近500亿立方米，相当于两个三峡防洪库容。
针对泥沙淤积问题，三峡水库采取“蓄清排浑”调度，汛期来沙较多时，在下游防洪承受能力范围内降低三峡水库水位运行，让含沙量较大的洪水顺利排到下游；汛后，水库存蓄清水，保证发电和航运。蓄水10年来，三峡水库年均入库泥沙量较初步设计值减少六成以上，年均淤积沙量为论证阶段预测值的42%，泥沙情况明显好于预期。
此外，中国三峡集团采取了库尾减淤调度，通过适时增加水库下泄流量、加大库尾河段水流速度，增大消落期库尾走沙能力，减少泥沙对库尾重庆江段的淤积。
纪道斌认为，改善长江口咸潮入侵，也是三峡水库生态调度的一个重要成果。“长江口盐水入侵是因潮汐活动引发的长期存在的自然现象，一般发生在枯季11月至次年4月。研究表明，三峡工程对改善长江口盐水入侵情势效果十分明显。如果在枯水年适当提前蓄水，适当加大最枯月份下泄流量，可进一步增大三峡工程抵御咸潮入侵的作用。”(完)
（原标题：三峡大学学者：三峡工程生态调度成果显著）
赞