Although the Yangtze River region occupies less than 3% of China's territory, the types and severity of disasters are not much less than other provinces and some of them are even worse. In addition to the main elements of a disaster, there are often many other secondary descendable disasters. For example, a strong typhoon can be seen as a storm surge in coastal areas, accompanied by strong wind, heavy rain, salt tide and tornado and so on. In great affected areas, different places have different severity and types of disasters: some are heavy rain, water soaking; others are strong wind that can blow buildings down. Of course, it would be better to make sure what the dominant factor is; when you can't differentiate, you can only decide according to local disaster factors. There is such kind of problems in hurricane winds of Yangtze River region. If you judge depend on surface words such as "hurricane" or "strong wind", it is difficult for you to make sure whether it is typhoon, cold current or local gust, or caused by a tornado and even can cause misattribution errors. The disasters are divided into 5 types in Yangtz River region including storm surge, flood, drought (including the locust disaster, flying sand), earthquake, geographical disasters (such as ground settement, slope stability, sand liquefaction).
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