20 1 1 What caused the drought in Poyang Lake and Dongting Lake? Geographical knowledge answer

1. The spatial and temporal distribution of precipitation in Hunan Province is uneven. Historically, the drought in Hunan Province is mainly in summer and autumn, but the combination of spring drought and summer drought this year, especially before the main flood season, is unprecedented since the founding of the People's Republic of China.

2. Decreased rainfall

The water storage capacity of the lake has decreased.

4. The area of the inner lake has dropped sharply, which directly leads to the lack of drought-resistant water sources.

5. Human beings transform nature unreasonably.

6. The Three Gorges Reservoir's water interception is too large, which leads to the downstream drought.

7. The precipitation is nearly half less than the average in the same period of normal years, and the water volume ranks first in the same period of history.

8. With the temperature rising in Poyang Lake basin, the precipitation concentration increases.

9. The transformation of El Ni? o and La Ni? a events in tropical Pacific Ocean is very abnormal.

10 ... global warming