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Gills spur-road retaining wall restoration

7th July 2013

Photograph of Gills spur-road retaining wall restoration

Staff with a Caithness civil engineering firm, working on behalf of the Highland Council, have been taking advantage of a recent astronomical phenomenon to secure the future integrity of a key access road in the Far North.

A small section of the foundations of the Council's 'spur' access road from the John O'Groats to Thurso A 836 route to busy Gills Harbour were undermined by the action of a 'very severe' sea-storm last winter.

In late June 2013, astronomers correctly predicted that the Moon would be closest to the Earth in 2013 at less than 222,000 miles away ... and the resulting increase in its gravity 'pull' could lead to noticeably higher and lower tides, with the latter ebbing down to near Lowest Astronomical Tides (LAT) levels. This is known as a 'lunar perigee', or as a 'super-moon' by 'fortune-telling' astrologers.

Part of the foundation of the Gills Harbour 6-metre wide access route, constructed for the Regional Council in 1989, became eroded during the severe Atlantic-origin Westerly storm of February 4th and 5th this year.

Record-breaking swell-heights were captured during that Atlantic storm, when gales reached hurricane force due to an extreme low-atmospheric pressure 'low' which swept over the North of Scotland.

The readings were from modern 'measuring devices' at the European Marine Energy Centre's experimental wave-power site near Stromness, Orkney and at several automatic wave-monitoring 'stations' in the North Atlantic near the North and West coasts of Scotland. Those included readings at offshore Metrological Office buoys of waves in excess of 20 metres (65 feet) in height.

Gills Harbour was unaffected by the severe North Sea storms of late 2012, which damaged East Coasts ports the length of Scotland, but the Westerly storms of February 4th were the severest experienced there for at least a decade.

The remedial measures at Gills were conducted for the Council 'sTEC Services (roads) section by local civil engineering and quarry contractors A & W Sinclair, of John O'Groats, with the very low tides allowing its employees to gain access with relative ease to the foundation-base of the roadway immediately to the West of the final approach bend.

Any year's maximum tidal range of c. 4 metres at Gills is usually seen in the spring (locally known as 'stream') tides nearest to the March or September equinoxes, rather than near mid-summer's day. A high atmospheric pressure area lay over the North of Scotland in late June, leading to an extra downwards pressure on the sea-surface and thus lower ebb-tides.

Those allowed the Caithness firm's staff to firmly fix a steel shutter to allow concrete to be poured and 'moulded into' the eroded 'hole', beneath the road's carriageway.

The spur road to Gills Harbour, which carries much of the heavy Orkney-bound traffic to Pentland Ferries ROPAX terminal there, is also expected to carry significant 'renewable energy' loads, although much of the heavier 'kit' may be sailed to Gills by cargo-ship or barge.

The 1989 access roadway, which replaced a single-track mainly un-surfaced predecessor, represents the only significant public-sector investment (c. 200,000) so far made at Gills, where all other works to date have been undertaken by its local community owners Gills Harbour Ltd and its lessee Pentland Ferries.

The latter company is also active at Gills this summer with civil engineering works to enhance sea-safety, by providing a 100 metre X 100 metre 'turning circle' to allow its modern catamaran ship Pentalina to access and leave Gills Harbour in forward motion in almost all weather states in the lee of its present 116 metre-long breakwater/berth and its planned 70 metre extension.

Both piers are recycled former World War II floating dry-docks, using dredged bed-rock spoil as ballast to minimise the effect on any natural wild-life in Gills Bay and added internal and external strengthening.

The terms of Pentland Ferries' consent for the works from Scottish Government agency Marine Scotland, means that the planned breakwater extension will be offset from the seaward end of the present one. This will permit 'tidal stream' renewables vessels to be berthed alongside without affecting scheduled ferry movements on the 15-mile-long 'short sea route' to St Margaret's Hope, on Orkney's main roads network.

During the month of May, most of Orkney's 'lifeline' traffic on HGV articulated trucks flowed though Gills Harbour on the unsubsidised Pentland Ferries operation. It provided the islanders with an 'essential service' when the rival Hamnavoe had to be taken off her Scrabster to Stromness route to allow a broken main engine crankshaft to be replaced at the Babcock International-operated dockyard at Rosyth, near Dunfermline, Fife.

Serco NorthLink Ferries Ltd's 28-mile long trans-Pentland seaway is bolstered by a taxpayers' subvention of over 10 million pounds per annum on its passengers, (over 100:00 per person), but the key freight is carried across the Firth by both firms 'on a commercial basis',.

In the case of Gills, this is by 'arctic' trucks driven over the spur-road access to the harbour's ferry 'link-span', the hydraulically-operated 'shore to ship' bridge.

Pentland Ferries Ltd's passengers are also carried without any Government support. Its entrepreneurial managing director Andrew Banks has fixed the return fare at 28:00 return on a year-round basis for all of 2013, lower than the rate on the subsidised Scrabster to Stromness seaway.

 

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