Zhejiang predicts that the impact of typhoon this year will exceed that of last year. What are the effects of typhoons?

Typhoon disaster is one of the main natural disasters in China. Under the background of global warming, extreme weather and climate events such as typhoons are getting stronger and more frequent. In the past five years, typhoons? Rammasun? 、? Rainbow? 、? Moranti? 、? Tian Ge? 、? Mangosteen? It has caused serious losses to the coastal areas of China. Before and after the typhoon landed, the public paid attention to the disaster risk of cities, especially big cities, and paid insufficient attention to rural areas and agriculture. Under the influence of typhoon, agriculture, as a sensitive disaster-bearing body, is more vulnerable to disasters. Typhoon disaster may cause crop failure in farmland and put farmers in danger.

First, the impact of strong winds on crops

The maximum wind speed of typhoon is often used to characterize the destructive power of strong wind on crops. For agriculture, strong winds are easy to cause crops to lodging or break their stems and leaves, resulting in different degrees of damage to crops.

The second is the impact of heavy rain on crops.

The adverse effects of typhoons and rainstorms on crops are mainly manifested in two aspects:

1. Heavy rain has mechanical impact and damage on the leaves and stems of crops, which directly leads to crop yield reduction;

2. Floods caused by heavy rain flooded crops, making it difficult for crops to metabolize normally. The deeper the flooding, the longer the flooding time and the more serious the harm.

3. Typhoon is a disastrous weather system with great influence. On the one hand, typhoons often bring abundant precipitation, which can alleviate the drought in some areas, ensure agricultural production, and is of great significance to maintaining fresh water resources and ecological environment; At the same time, typhoons can promote heat circulation and play an important role in maintaining heat balance. On the other hand, typhoons are sudden and destructive, and often bring huge losses, which is the most important in the world.

Third, the current typhoon research.

According to the characteristics of rainstorm, the influence of a typhoon rainstorm on agriculture was studied. In the risk assessment of typhoon rainstorm disaster, typhoon precipitation can supplement the shortage of water resources in time, which is beneficial to the growth of late rice and middle rice. In the evaluation of agricultural disasters caused by typhoon and rainstorm, only using precipitation intensity index can not fully reflect the impact of rainstorm and flood. Remote sensing technology can be used to compare hydrological information before and after typhoon, so as to realize the acquisition and analysis of rainstorm and flood disaster information.