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A83 task force reviews mitigation progress

Recent landslides at Rest and Be Thankful in Scotland were the main topic of discussion at yesterday’s A83 task force meeting, which was brought forward by three months following further ground movements.

“This meeting was originally planned to go ahead in the Summer but I thought it was important that we let communities in the area know now that we are committed to the programme of work that is managing and reducing the risk of landslides along the A83 trunk road,” said Scottish transport minister Keith Brown who chaired the meeting.

The A83 route has been closed several times so far this year as a result of landslide and the Old Military Road diversion route has also been used for the first time to reduce the diversion route. Brown reported to the task force that installation of netting to reduce the risk of landslips was underway and had been successful in reducing the risk of landslides reaching the road.

A large boulder above the debris flow has formed a dam that put the area at risk of a larger landslide

Source: Image by permission of Dr Mike Winter, TRL

A large boulder above the debris flow has formed a dam that put the area at risk of a larger landslide

“Over the last seven years, we have invested over £32M on the A83,” added Brown. “This includes, £7.5M on the A83 around the Rest and be Thankful, a clear sign of our intent to find solutions to keep the A83 open and operational.

“We cannot prevent landslides from occurring, but we can help manage and reduce the impact and disruption caused to the public and local businesses using this vital route.  This was demonstrated during this most recent landslide where we used the Old Military Road local diversion route for the first time.  This helped cut the traditional diversion by more than 65km and saved local people time and money as a result.

“As our work around the Rest and Be Thankful nears completion, the netting installed in this area has already prevented debris from the hillside reaching the road and we continue to look forward.

“Investigations at other known high landslide risk areas on the A83 at Cairndow, GlenKinglas and Loch Shira are on-going and we are looking at options to provide mitigation of a similar level to the Rest and Be Thankful at these locations.

“Our budget discussion for the next financial year are on-going but this work is a priority and I want to see the level of momentum and commitment that we have seen on the A83 continuing in future.”

 

Debris flow barrier installation continues

Scottish transport minister Keith Brown hailed the success of debris flow barriers installed on the A83 so far and more are currently being constructed at the Rest and Be Thankful.

Rock netting supplied by Maccaferri is being installed by contractor Geo-rope to a design developed by Waterman based on geomorphological assessments by Geomorph Consulting. The netting will form 10 new barriers in addition to the eight that have already been constructed by Geo-rope on the slopes above Rest and Bet Thankful.

Performance of the Maccaferri barriers will be constantly monitored using a web hosted asset monitoring system developed for use with the Maccaferri systems by Itmsoil. The instrumentation will integrate real time remote monitoring and logging of barrier conditions and automatically triggered day/night photogrammetry. This will provide quantitative data on barrier performance and help with network management and scheduling of unplanned maintenance events in response to debris flows.    

The new barrier will be monitored using a web hosted asset monitoring system developed for use with the Maccaferri systems by Itmsoil

The new barrier will be monitored using a web hosted asset monitoring system developed for use with the Maccaferri systems by Itmsoil

       

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