How to build a beach

14 Sunday Apr 2013

Posted by theresagreen in coastal habitat, Colwyn Bay, nature photography, North Wales

Tags

colwyn bay beach, dredging sand, herring gull, herring gull feeding behaviour, sea defences

The beautiful but rugged coastline of North Wales is subject to some serious battering by winds and waves throughout the year and although we love to live and holiday here, of course we prefer it to be on our terms and so demand protection from the elements too. We also need to make a living and as this whole area is designated as an outstanding area of natural beauty, capitalising on those natural assets by way of tourism is the way things are set to go forward. Great lengths of piled up rocks are already in place reinforcing the defences of the sea wall from Rhos on Sea to Penrhyn Bay, but now work has begun to improve the defences of Colwyn Bay.

A section of the Colwyn Bay promenade being battered by the sea, March 2013

Colwyn Bay was one of the North Wales holiday resorts popularised by the Victorians. It was accessible to them by way of the railway line between the ferry port of Holyhead on the Isle of Anglesey, and London, that was built to facilitate the transport of mail between the two places and onwards to Ireland by sea. It remained popular as a holiday destination for several decades following, my own parents spent their honeymoon here in 1946, but began to go into decline during the late ’80s, in common with many other British seaside resorts.

In 2010 a ‘masterplan’ was revealed to regenerate the area which includes plans for a new sandy beach to be constructed to improve sea defences and to allow people access to the shore throughout all tidal states: currently you can only walk on the shore at low tides.

As reported at the time by The Weekly Post, this build-a-beach project is not going to come cheap.

“Conwy County Council’s cabinet voted to pledge £667,000 to secure a grant of £2m from the Welsh Government to improve the town’s sea defences. The authority had already secured an additional £1m of funding from the Welsh Government for the Colwyn Bay Waterfront coastal defence scheme by offering up £333,000 of supported borrowing from this year’s capital programme. By agreeing to pay the £667,000 from next year’s (2013) budget the council…will see beach sand material imported onto Colwyn Bay seashore which is now mostly pebbled. This will result in 50m of sand to help protect the promenade.”

Work began on building the new beach on 21st March and the major project of engineering is proving to be quite fascinating. To begin with two lengths of steel pipeline were constructed on an unobstructed stretch of Pensarn beach, one a kilometre long, the other about 400m long. The two sections were then floated out at high tide, lined up and welded together. The pipeline was then connected to the steel dry-line which is pumping the sand onto the beach. A rubber floater line was also connected to the sea end of the steel pipeline, and this section of pipe will connect to the dredging vessel.

Sand begins to pour from the pipeline against the existing sea wall. Picture from Daily Post.

The dredging ship, the Barent Zanen, sailed here from Rotterdam and prepared to dredge sand from the seabed of a site 20 nautical miles north of Colwyn Bay, located within Liverpool Bay. The ship is taking the sand from the sea bed approximately 20 miles north of Colwyn Bay, and then sailing in and anchoring about a kilometre offshore. Around 10,000 tons of material is brought in each trip and it is estimated that the beach will be topped up at a rate of 25-30,000 tons a day.

The Barent Zanen off Rhos Point, connected to a smaller tug that connects the two ends of piping together

The sand and sea-water mix is blasted onto the beach during periods of low tide and attracts a huge amount of interest from a large number of gulls that arrive to take advantage of seafood, freshly delivered from the seabed. As far as I am aware, no mention has been made of any potential damage the dredging may be doing to the flora and fauna of the seabed in the dredging site, but I can’t help wondering.

The dredged sand and seawater mix arriving on the shore brings about a frenzy of gull activity

Following each delivery of sand, which is deposited in one large pile, it is distributed by mechanical diggers and bulldozers. The work often attracts groups of interested onlookers, and no doubt at least some of the big boys watching would love to be having a go.

A closer view of some of the machinery involved in the beach construction; here moving the steel pipeline into a new position

6th April, the new beach so far

The operation will take place 24 hours a day, seven days a week and should last for a period of up to four weeks, depending on the weather, which thus far has been pretty wild. Many local people are wondering how long the beach sand will stay put and how much it’s going to cost them…..?

Hungry Herring Gulls

21 Wednesday Sep 2011

Posted by theresagreen in birds of the seashore, Birdwatching on North Wales coast, Nature, Nature of Wales, Rhos-on-Sea

≈ 2 Comments

Tags

colwyn bay beach, herring gull, herring gull feeding behaviour, herring gull juveniles begging for food, larus argentus

Walking along the sea shore the other day I came across a Herring Gull in the process of eating a fish. I have no idea what species of fish it was, all I can say is that it was a flat fish and either whole or almost-whole, either way, large enough for me to be amazed that a bird could even attempt swallow it.

17/9/11-The gull with most of the fish in its gullet

17/9/11- It was not going down easily, so it had to come back up again

17/9/11-A second attempt -and this time the fish disappeared

17/9/11- All that remained was a lump in the gull's crop - it should keep him going till at least lunchtime

Herring Gulls are omnivores and opportunists like most Larus gulls, and will scavenge from rubbish dumps, landfill sites, and sewage outflows; food obtained this way may comprise up to half of the bird’s diet. Despite their name, they have no special preference for herrings — in fact, examinations have shown that echinoderms and crustaceans comprised a greater portion of these gulls’ stomach contents than fish.

On Colwyn Bay seashore I witnessed more gull feeding behaviour, this time two juveniles were begging an adult, presumably a parent, to feed them.

Young Herring gulls persuading a parent to feed them

Juveniles use their beaks to “knock” on the red spot on the beaks of adults to indicate hunger. Parents typically disgorge food for their offspring when they are “knocked”.

Parent gulls will feed their offspring for up to 6months if they continue to beg

Chicks are generally fed by their parents until they are 11–12 weeks old but the feeding may continue up to six months of age, if the young gull continues to beg. The male feeds the chick more often than the female before fledging, the female more often post-fledging.

The adult was persuaded to disgorge what it had eaten onto the sand

The young birds begging did the trick and the adult disgorged whatever it had eaten onto the beach, which did not look at all appetising from where I was standing, but the three birds seemed to be happy with it.