(如題)
Storm surge and high tide the cause of floods
Typhoon Hagupit's easterly winds and the storm surge they caused
combined with a high tide to cause flooding and relatively severe dam-age
on the territory's coasts.
The damage was far greater and affected far more people than when
Typhoon Nuri scored a rare direct hit last month-though Nuri did sweep a
swimmer to his death at Big Wave Bay,Shek O.
While Hagupit caused the No 8 storm signal to raised whereas Nuri
was a No 9 storm,the Observatory said Hagupit was the more intense.
"The sustained wind near the centre of Hagupit was about 170km/h,
higer than that of Typhoon Nuri,which was about120km/h,"scientific
officer Woo Wang-chun said.
"The winds mainly came from the east when Hagupit passed the city,
which normally brings more impact because of the landscape of Hong
Kong,"Mr Woo said.Nuri's winds came mainly from the northwest.
Hagupit also caused a bigger storm surge than Nuri.
"The sea level in Victoria Harbour was about 1.4 metres above normal
tide heights last night while the rise due to Nuri was only 0.6metres,"Mr
Woo said.
When Typhoon Wanda tore through the city on September 1 ,1962,
it brought a peak gust of 259km/h in Victoria Harbour and winds of
284km/h at Tate's Cairn above Kowloon.A 3-metre stormsurge in Tolo
Harbour flooded Sha Tin and Tai Po,and about20,000 people were left
homeless.
Ken Woo Kwong-po,acting technical secretary in the Drainage
Services Department,said there were limits to what anyone could do about
a storm surge."If there is flooding in low-lying areas of the northern New
Territories, we can contain it and send in pumps to water away,"he said.
"But how can we fight against the force of the ocean?It is simply impossible."