The strong typhoon on July 28th was the typhoon that triggered the "Extraordinary Storm Surge in Niu Tianyang on July 28th". During this period, during the astronomical tide of1June, 969 (Gregorian calendar1July, 28, 969), the coastal area from Shantou to the Pearl River Estuary was hit by a strong storm surge, and the highest tidal level at Shantou, Haimen, Dongxikou and Chiwan tide gauge stations reached an all-time high.
With the typhoon, the water level in Shantou Port suddenly rose by 3. 1 m, and the wave height 10 was more than 0 m.. Seawater flows back to the inland 10 kilometers, flooding 870,000 mu of farmland and 8238 1 room collapsed. The seawall of 85km long and 3.5m high in Niu Tianyang Reclamation Area of Chaoyang County was cut off by 2m, leaving only1.5m high, and the average inflow of Shantou City was 65,448.
Direct disasters caused by typhoons
1, gale
The wind speed of typhoons is mostly above 17m/s, even above 60m/s ... According to the measurement, when the wind reaches 12, the wind pressure per square meter on the plane perpendicular to the wind direction can reach 230kg. Therefore, when a super typhoon comes, strong winds and the huge waves caused by them can throw up or even smash coastal ships; It is also enough to destroy or even destroy buildings, bridges and vehicles on land.
2. Heavy rain
When the typhoon lands, the rainfall center can drop 100 to 300 mm, or even 500 to 800 mm of heavy rain a day. The flood disaster caused by typhoon and rainstorm is fierce and destructive, and it is the most dangerous disaster.
3. Storm surge
When the typhoon moved to land, due to the typhoon's strong wind force and low air pressure, the sea water piled up strongly towards the coast, the tide level soared, and the water waves flooded the coast, resulting in the overflow of the tide, the breakwater, the destruction of houses and various building facilities, the flooding of towns and farmland, and a large number of casualties and property losses.
The above contents refer to Baidu Encyclopedia-Typhoon 7.28.