xilihutu
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加入时间: 2007/03/29
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作者：xilihutu 在 罕见奇谈 发贴, 来自 http://www.hjclub.org
The proposed operating procedure at Three Gorges is as follows: during the flood season (May through September), the reservoir level would be held at a low pool elevation, called the Flood Control Level (FCL). During this period inflows are used for power generation. After the flood season, the lower flows with lower sediment concentration will be impounded, and the reservoir pool level will rise to the Normal Pool Level (NPL).
It is proposed that in time, sediment will be deposited in the reservoir until a uniform slope of the bed will be established that can just transport the annual sediment load through the reservoir. It is estimated that this condition will be reached between 70 and 150 years after construction, depending on the choice of the elevation for the Flood Control Level (FCL).
There are an estimated seventeen reservoirs in the world that operate in this manner, seven of which are in China and one in the United States .(2) All of these except one are small in size. That exception is Sanmenxia in China , which has only eighteen percent the storage capacity of Three Gorges - in other words, very much smaller. Thus the world's experience with this type of operation is very meager.
These uncertainties lead to the conclusion that significant fiscal forecasts that presume to support the financial benefits expected may be in error and that investing in the project would be unwise. There are several sources of such error in dredging costs, resettlement costs, flood control benefits, and other areas, but the present discussion deals with the problems only in the subject of sedimentation.
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http://www.moafs.org/newsletter/April%202002/3gorgluna.htm
作者：xilihutu 在 罕见奇谈 发贴, 来自 http://www.hjclub.org
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为什么三峡水库必须进行反调节？
