Abstract:
Based on the hourly-observed weather data and disaster data of nine strong typhoons landed in Guangdong province since the year 2000, the spatial and temporal evolution, distribution, and causes of gales as well as their relationship with collapsed houses are analyzed. The results show that: (1) Hourly maximum wind speeds of nine typhoons are all in the first and second quadrants before the landfall, after which 77.6% of them fall in the fourth and first quadrants. Gales of force 10 and above are distributed mainly in the coastal areas and on the right side of typhoon tracks with durations between 10-24 h. In addition, gales of force above 12 lasted 8-13 h in four typhoons. (2) The influence of gales is expressed by the "station-hour" based on the ranges and durations of gales. It is found that the "station-hour" samples of gales mainly appeared before the landfall. (3) The underlying surface has a significant effect on the distance and duration of the typhoon gales penetrating into the land. When the typhoon passes through the intersection area of land and water or the gentle underlying surface, the wind penetration to the land is larger. (4) The number of collapsed house is correlated with the central pressure, maximum wind speed, influence range, maintenance time, and "station time" of typhoon gales, especially with those of gales with force 12 or above.