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Written by: Kuang Xiaobin
2020-06-14 12:32
Last update date: 2020-06-14 12:32On June 6, the Observatory issued the first black rainstorm warning signal in three years, lasting about 3 hours. The Secretary for Development, Huang Weilun, said in his blog today (14th) that the Observatory issued a landslip warning in the early hours of the day, which has been in effect for more than 36 hours. During the period, 27 landslide reports were received. The Landslip Survey Team of the Geotechnical Engineering Office of the Civil Engineering and Development Department immediately reviewed each report and dispatched a team of professional and technical personnel to the site to investigate the cause of the landslide accident.
A heavy rain in May 2016 caused many landslides in Sai Kung District. Among them, a severe landslide occurred on the natural hillside of Xiwan Road. The collapsed 2,100 cubic meters of mudstone blocked the access to and from Sai Wan Village. (Development Bureau Information Picture)
Huang Weilun pointed out in his blog that Hong Kong has more rain and more rain, especially climate change will bring more frequent and stronger rainstorms. It is almost impossible to achieve zero risk of landslides.
Saigon Sai Wan Road has built a flexible protective net
Wei Zhuoting, a civil engineer at the Civil Engineering and Development Department, said that a heavy rain in May 2016 caused a serious accident on the natural hillside of Sai Wan Road in Sai Kung. The collapsed 2 100 cubic meters of mud and stone blocked the access to Sai Wan Village. The serious accident is a deep landslide with a depth of about 12 meters, which is not common in Hong Kong. Since the natural hillside is up to 100 meters away from the road, they applied innovative technology, including using drones to observe and photograph the situation after landslides occurred, and using no-load laser scanning and photogrammetry technology to collect data to create a three-dimensional digital terrain model. To help understand the cause, scale and process of landslides more thoroughly, and to assess the risk of landslides recurrence.
The survey team went to the incident site for field investigation after the weather was stable, but the landslide residues on Xiwan Road were very steep, and it was not feasible to go up the mountains along the residues. Mountain Road arrived at the scene. At present, a flexible protective net has been built on the natural hillside, and a warning sign is placed to remind the public to stay away from the slope.
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