Friday, November 30, 2012

The only thing worse than a landslide is a Chinese landslide




The threat of landslides in the area around the recently (2006) constructed Three Gorges Dam in China has increased over the last 6 years. The cause of this increase is the very dam itself. This is the world largest hydroelectric dam, to give you an idea of how much water runs through this thing. The construction of this dam brought much criticism from geologists and environmentalists who recognized some potentially problems of this dam, one of which being landslides. Since the dam reached its high water mark in 2010, landslides have risen seventy percent. This growing threat of landslides has caused the Chinese government to relocated 46,000 people, with the planning of relocating an additional 100,000 out of this area. Hindsight is 20/20 so I can’t criticize the Chinese government to hard over the construction of the Three Gorges Dam. At the same time, the Chinese have made and continue to make poor planning decisions (as well as other countries). A prime example of this comes in the form of nuclear power. Of China’s 27 reactors, 19 of them are located in areas at risk of tsunamis.
Landslides are unlike other natural disasters that we face because of their uncertainty. We know that hurricanes typically occur in the months between June and November, just like we know when the monsoon season starts in some areas. Landslides are a different beast because there are many variables associated with its’ prediction such as rainfall, vegetation, and elevation. In summation, it’s extremely difficult to predict landslides and their rapid onset characteristic make them even more dangerous. Not only are landslides dangerous events in themselves but they can also trigger other events, like a 65-foot wave that killed a dozen people in China. The main cause of Chinas landslides in regards to this article are due to dam water levels raising. Another major contributors to landslides is deforestation. Once vegetation like grasses, trees, and the like are removed there are no roots to anchor the soil. This might be fine if nothing else happened, but this is the real world (not to be confused with the awful MTV series!). Over time precipitation will soak into the ground and reach the bedrock, which from there the devastation occurs. 


Source: http://www.nytimes.com/2012/04/19/world/asia/landslide-peril-near-chinese-reservoir-grows-official-says.html?_r=0