{"id":20001103,"date":"2011-03-22T11:12:42","date_gmt":"2011-03-22T11:12:42","guid":{"rendered":"http:\/\/184.172.177.95\/~chinad\/?p=1103"},"modified":"2011-03-22T11:12:42","modified_gmt":"2011-03-22T11:12:42","slug":"at-fault-on-the-nu-river","status":"publish","type":"post","link":"https:\/\/dialogue.earth\/en\/water\/at-fault-on-the-nu-river\/","title":{"rendered":"At fault on the Nu River"},"content":{"rendered":"

As China gears up for a hydropower push in its earthquake-prone south-west, it should pause to consider events in Japan, two geologists tell Liu Jianqiang on World Water Day.<\/p>\n

\"\"<\/a><\/strong>With the ongoing crisis at its earthquake-damaged\u00a0Fukushima<\/a>\u00a0nuclear plant, Japan is paying a heavy price for ignoring \u201clarge-scale environmental evaluations\u201d. This is the assessment of two prominent Chinese geologists, Xu Daoyi and Sun Wenpeng, who told\u00a0chinadialogue\u00a0that the incident holds important lessons for China.<\/p>\n

\n

The two experts argue that the Japanese authorities underestimated the potential impact of deep-ocean faults and earthquakes on power plants. As a result, they failed to locate their atomic energy facilities on the country\u2019s less vulnerable west coast and, ultimately, to avoid the radiation crisis the world has watched unfold over the past week.<\/p>\n

There are worrying parallels in China, said Xu and Sun. But rather than focusing on the nuclear industry, their gripe is with their country\u2019s hydropower sector \u2013 and, more specifically, the\u00a0controversial plans<\/a>\u00a0to build a cascade of dams on the\u00a0Nu River<\/a>, China\u2019s last great waterway without large-scale hydropower and the focus of an animated public campaign.<\/p>\n

Xu,\u00a0a retired researcher from the\u00a0China Earthquake Administration\u2019s Institute of Geology<\/a>,\u00a0and Sun, a former employee of the\u00a0China National Nuclear Corporation<\/a>\u00a0(CNNC), who was once in charge of evaluating the nation\u2019s uranium resources, have written to the Chinese premier, Wen Jiabao, setting out their concerns. In their letter, they write that the risks of building dams on the Nu \u2013 a plan that was shelved in 2004 following a public outcry, but has recently been revived \u2013 have not been fully assessed. \u201cWe are extremely troubled by this,\u201d they add.<\/p>\n

Xu spent 40 years working in the field of earthquake prediction [Editor\u2019s note: While\u00a0earthquake prediction<\/a>\u00a0is a controversial or even discredited field of science in many parts of the world, in China it has long been part of the national earthquake administration\u2019s programmes on quake monitoring and disaster prevention, although\u00a0reports suggest<\/a>\u00a0it may soon be phased out.]. Sun specialises in structural geology and, before his retirement, worked at CNNC\u2019s\u00a0Beijing Research Institute of Uranium Geology. They argue that, as the Nu River lies on a structural fault at risk of earthquakes, there are enormous risks involved in building dams there \u2013 and that pressing ahead with these plans flies in the face of common sense.<\/p>\n

When Xu and Sun first heard about proposals for large-scale hydropower development on the Nu River — which starts high up on the Tibetan plateau and flows through south-west China and down to the Indian Ocean — they were shocked. \u201cTectonic movement in [Yunnan\u2019s]\u00a0Three Parallel Rivers<\/a>\u00a0area is stronger than anywhere else in the world\u2013 how can they build a cascade of dams here?\u201d asked Sun.<\/p>\n

The pair pointed to three major risks. First, tectonic activity in this region means\u00a0earthquakes are both strong and frequent<\/a>. Second, other geological events such as mudslides are common. Third, tectonic movement has been strengthening: earthquakes and other disasters are becoming more frequent in the region, claim Xu and Sun, and the combination of climate extremes, tectonic and seismic activity is increasing the risks of a major disaster.<\/p>\n

Debate over dams on the Nu River has been raging for eight years. The first report on hydropower development on its lower and middle-reaches recommended building a cascade of 13 dams, with generating capacity of 21.32 gigawatts. But in 2004, following a public outcry, Beijing imposed a\u00a0dam-building moratorium<\/a>\u00a0on the river. Then, in January this year, Shi Lishan, deputy head of the New Energy and Renewable Energy Division of China\u2019s National Energy Administration,\u00a0said<\/a>: \u201cMy belief is that development [on the Nu] is a must.\u201d<\/p>\n

This was the first time the National Energy Administration had made clear its views, and appeared to indicate that hydropower in China is about to enjoy a \u201cgreat leap forward\u201d. However, the official pronouncement has drawn fierce criticism from Chinese NGOs, the media and the public. [Seechinadialogue\u00a0article \u201cHydropower\u2019s Green Excuse<\/a>\u201d for more detail on this].<\/p>\n

However, Xu and Sun\u2019s statements mark\u00a0the first time in eight years that geologists have publicly expressed doubts over the plans.\u00a0In their letter to Wen Jiabao \u2013 a geologist himself, who like them graduated from the\u00a0China University of Geosciences\u00a0—\u00a0Xu and Sun write: \u201cNo fixed steel and concrete dam can withstand the shearing movement of the Nu River fault, nor can anyone prevent the huge mountainside collapses, landslides and mudslides that still happen on the banks of the river.\u201d<\/p>\n

Sun and Xu say that there is no precedent for building such a large hydropower scheme over an active fault, and that we should not be lured into complacency by China\u2019s recent successes in the construction of large dams. The unusual geology of the Nu River means that the risks here are greater than elsewhere: the fault that forms the Nu River is still active. And, if built, the cascade of dams will run directly across it. \u201cIt\u2019s like building on the blade of a knife \u2013 we are taking a huge risk,\u201d said Sun.<\/p>\n

Even the geologists who drew up the plans for the Nu River dams agree, according to Xu and Sun. Everyone admits that the geological structure of the lower and middle-reaches of the Nu River is complex. The Nu River fault is the major geological feature of this stretch of the river and is the central factor in determining dam location and safety. \u201cBut we feel the planners weren\u2019t wary enough of those geological hazards, with risk evaluations mainly, or even only, looking at the factors affecting individual dams \u2013 these were separate \u2018micro-evaluations\u2019 [and not, broader \u2018macro-evaluations\u2019],\u201d said Xu.<\/p>\n

Xu said that over the past two centuries, and particularly in the last 60 years, western China (and especially the south-west) has been hit by frequent earthquakes: in 1950, an 8.6-magnitude earthquake in eastern Tibet, near the Nu River; in 1976, an 7.3-magnitude quake in Longling, Yunnan; in 1988, earthquakes measuring 7.4 and 7.2 on the Nancang River and at Gengma; in 1995, an 7.3-magnitude quake on the China-Myanmar border; and in 1996 one measuring 7.0 in Lijiang. All of these are on or near the Nu River.<\/p>\n

According to Xu, there has been a clear increase in the number of strong earthquakes in the south-west of China over the last century, a fact that should not be ignored when evaluating regional geological stability and earthquake trends. To date, he has not encountered any geologist or seismologist who does not expect a major earthquake on the Nu River during the twenty-first century.<\/p>\n

Both Sun and Xu believe that earthquake damage is not limited to the epicentre: its extent is related to the strength of the quake, and the stability and integrity of the surrounding geology. Even a large earthquake far away from the Nu River could trigger local disasters, such as mountainside collapses, landslides and mudslides.<\/p>\n

Xu said that one possible scenario is that a failure at one dam causes a chain reaction in dams further downstream. If one hydropower plant is damaged, particularly if it is located upstream, hundreds of millions of cubic metres of water, carrying large quantities of mud and rock, would rush down the straight, narrow and steep river valley. The damage would be devastating. \u201cThere wouldn\u2019t even be any survivors to rescue,\u201d said Sun. \u201cAnd it\u2019s an international river \u2013 if the disaster were to extend to countries downstream, I\u2019m afraid China could not cover the costs.\u201d<\/p>\n

Another risk is that hillsides could collapse into the reservoirs, creating huge waves that threaten the dam, or forming blockages that will impact on local hydrology and on the lower reaches of the river. The\u00a0huge mudslide<\/a>\u00a0that hit Zhouqu in Gansu, north-west China, last year \u2013 and which many have blamed on human development in the area \u2013 should be an important lesson for those considering hydropower construction on the Nu River.<\/p>\n

Perhaps in response to the concerns raised by these two geologists, two long-standing supporters of the Nu River plans \u2013 the\u00a0China Society for Hydropower Engineering\u00a0and the\u00a0Chinese National Committee on Large Dams<\/a>\u00a0\u2013 held a meeting in Beijing on March 6, to which they invited hydropower and geological experts. Speaking at the event, Xu Xiwei, head of the\u00a0China Earthquake Administration\u2019s Institute of Geology, said: \u201cJapan lies where the Pacific plate pushes west \u2013 why can they build dams there, but we can\u2019t do the same here?\u201d<\/p>\n

But Sun told\u00a0chinadialogue: \u201cHe\u2019s mixing things up. You can\u2019t compare Japan and the Nu River.\u201d Japan lies on one side of a fault, while the Nu River runs through the fault itself, he explained. \u201cYou could say Japan is on the side of a knife, while the Nu River is on the blade.\u201d<\/p>\n

In fact, recent events in Japan demonstrate just how serious the issue is for China, added Sun. The Fukushima nuclear plant wasn\u2019t built on the fault: the problems were caused by a chain of events triggered by the tsunami. If anything happened to a dam on the Nu River the consequences could be even worse.<\/p>\n

\u201cJapan took a gamble by building the plant there, and lost. The officials all say the disaster could not have been predicted. In fact, the authorities were warned about the risk \u2013 and they chose to go ahead anyway.\u201d<\/p>\n

 <\/p>\n

Liu Jianqiang is the Beijing-based deputy editor of\u00a0chinadialogue.<\/p>\n

Homepage image from\u00a0Chen Zhao<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

As China gears up for a hydropower push in its earthquake-prone south-west, it should pause to consider events in Japan, two geologists tell Liu Jianqiang on World Water Day.<\/p>\n","protected":false},"author":20000134,"featured_media":20003071,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[757,50039903],"tags":[519,50040314,554,580,50040707],"hashtags":[],"country":[20000110],"class_list":["post-20001103","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-energy","category-water","tag-climate-impacts","tag-dams","tag-hydropower","tag-policy","tag-the-third-pole","country-china"],"acf":[],"yoast_head":"\nAt fault on the Nu River | Dialogue Earth<\/title>\n<meta name=\"description\" content=\"As China gears up for a hydropower push in its earthquake-prone south-west, it should pause to consider events in Japan, two geologists tell Liu 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