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15 Cards in this Set
- Front
- Back
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Where is the river yangtze? |
Flows through china. |
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How big is the river yangtze? |
Third worlds longest river in the world, 6380km long. |
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What is common within the river yangtze? |
Season flooding-rainy season from june to august causing high discharge. |
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How many floods over the last century? |
5 major floods. |
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How big was the flood during 1954 and how many killed? |
193000km2 33169 |
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How many people killed in 1998 and how many homeless? |
3000 people killed, 14 million homless. |
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What flood protection is used for the river Yangtze? |
Hard engineering. |
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What hard engineering techniques have been used? |
-46 dams planned or under construction. -3600km of levees along the middle and lower part of the river. |
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What is behind the dam and why? |
The reservoir builds up behind the dam, it cataches any flood water and can be released slowly over time. |
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How much water can the reservoir store? |
22km3 of flood water. |
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What power does the reservoir produce? |
hydroelectric power largest in world with 26 turbines. |
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what has build along side the dam? |
locks so ships can get past is easily. |
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Positive effects of the dam? |
-reduced major flooding from once every ten years, to once every 100 years. -dam produces electricity 3% of demand for china. -reduction in river much more safer to navigate up the river, bigger ships can also travel because the reservoir is deeper, than the old one. |
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Negative effects of levees? |
-1998 levees broken contributing to devasting floods. -levees were reinforced, they were effective at reducing 2002 floods. |
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Negative effects of the dam? |
-people relocate as water levels in reservoir risen, 2m people relocated. -13 cities submerged and 1352 villages -farmland, 657 factors, 1300 cultural and historic sites such as temple of zhang fei. -dam will trap sediment which could lead to failure of dam causing further flooding. -destory habitats and endanger species, fewer baiji dolphins over 100 with reduced food supply. -doesnt protect everyone, flooding in tributaries which lead into into such as daning river. |
