exports the same quantity of energy in green electricity and hydrogen as it exports in thermal coal and liquefied natural gas. What insanity! There have been high profile storms on the NSW East Coast since the mid-70s. and the second last line of your article states- Thats awesome. This widely publicized protest was an attempt to promote a pro-democracy, civil liberty, social justice message, and to protest against corporate greed and economic inequality. Take a chill-pill mate, or possibly the whole packet as it appears you need them. But if I get burnt out, then someone's going to be held to account"! Perhaps off topic in relation to the above story but thought this video was interesting in regards to how certain structures change the amount of erosion and inundation behind structures from wave/tidal run up. Lawsuit waiting to happen when a swimmer/surfer gets nailed by a rogue piece of concrete either down the 'Roy or up towards Northy. Would suck if you got amalgamated into Northern Beaches council then had to pay tax for this. During periods of low swell energy, sand accumulates on the beach, widening the profile and forming a natural barrier for when storms and large waves erode the coastline. they will use loop holes to ensure eligibility. Might be time to lawyer up. I will check with him and report back. A much higher amplitude as well. Brendan Donohoe says the beach has been "permanently disabled. And there's no risk. In a story on Northern Beaches Review, Bob Orth, who lives in one of the houses behind the seawall, said the seawall should inspire others to do likewise. Might discuss that with @surfriderfoundation and Surfrider Foundation Sunshine Coast, and those people and localised groups finding themselves in positions of having to fight this idiocy. Its an issue the whole coastline, councils desperate to get what is a liability off their books and some homeowners, beachfront, genuinely caught out by it. Any example around the world that have worked with out wrecking a beach but holding back erosion in built up areas ? "The only feasible way forward without wasting any more council and tax payers money to protect the properties in question is to acquire the properties at any cost and return them to a naturalised stated." The thing is- in those pics, behind the walls, there's really not much to protect. Or boarding a jumbo jet to go for a surf and buy the latest board all things responsible for the needing of the wall in the first place. That is why this option was selected for Palm Beach Qld, and I think should be considered for all the other coastal erosion hotspots along the NSW coast as well. oh yeah and someone call security. as the article states coastal erosion has been known since the 20s in that area and has been studied meticulously ever since. It only does BOUSSINESQ wave interaction and NOT sediment transport but you can still get a lot of good design-feedback A new wavepool development for the Sunshine Coast points to the future of pools in Australia. Over the coming fortnight there's a couple more swell forecast from the east-northeast and that'll really put the structures to the test. This is the only plausible outcome from the hard seawall construction and the engineers would have known this. Lake that has been going on for the last 20 years. We had made a big mistake that would become bigger. The main issue is that the cables are protected in whatever is proposed. The role of the council in all this might come out if people push hard enough. However the short period easterly swells go straight into all parts of the surfcoast digging it up and turn almost every beach with low swell energy into an ugly mess. These walls stick straight up into the air like a fence made of steel or concrete. "Protective works are a far preferable measure to a vertical seawall," he said. The local community group has been protesting against a seawall for almost 30 years. There's been significant coastal erosion (acute) along the GOR in recent years, though only a handful of places have experienced coastal recession (chronic). It didn't last long and within 12 hours the sand that was built up against the near finished first wall was 2/3rds washed away. That's so shithouse I don't know where to start, Zen. While celebrating his record for coastal protection with a park on the Collaroy-Narrabeen stretch, Northern Beaches council was also processing a Development Application thatd threaten the very same beach. Is there a sea wall at Collaroy? Yea I agree with this. Thanks Craig aod if you are THE Jody P, yes you are a ledge. Those days are gone, but we can make the future even better IF we use our brains like you say! I also presume the view of the houses will be enhanced by the no trespassing signs in large red writing. The best thing about it is that you can output actual 3d animations of the simulation so that EVERYONE can understand the results. They may have a wall, but there will be no beach in front of it. If the houses go, the road goes shortly after. Yep, prevents over-topping but how's the reflection and enhanced rebound wave back into the surf zone!? Great article highlighting the competing interests of the natural environment and local councils (which are too easily manipulated by wealthy stakeholders). Like Stockton, the Collaroy seawall has resulted in the loss of the beach immediately in front of the wall caused by the dissipation of wave energy. Thats just a done deal. Yes it is. Northern Beaches Council are the biggest tossers ever. It just doesn't make the engineering firms any money or contribute to gross state product under the current economic system. The DA for the Collaroy seawall was approved while the Northern Beaches Council was under administration. Collaroy homes along Pittwater Rd have been cordoned off today. It would be a good idea to put in a surf cam in that pans up and down the wall to document any changes to the beach, sand movements, erosion problems etc. Though they were quick to remove signs only recently erected on the beach.. https://www.smh.com.au/national/nsw/council-was-asked-about-danger-signs To be replaced with signs "Collaroy artificial reef project 2023", This is a glimpse of what a beach could be; following sensible Council planning; (post storms in 1974) eg. Might chat about it at some point Craig Brokensha, and anyone with deeper connections or insights, feel free to pass me their contacts and we can compare notes and research and discussion points. Preparation of sea wall GPS file suitable for upload to GPS rover or machine guidance equipment. There's no sense at all in building something like this from an engineering perspective. But unlike a rock revetment at Stockton, which gradually collapses into the beach, Collaroy's sheer concrete wall relies on deep foundations to stabilise it. My NSW water buddy says MHL are coyboys. Completely agree that not all beach owners are cashed up pricks. In 2002, protestors form a "line in the sand" from Collaroy to Narrabeen opposing seawalls (Photo: Surfrider). And in the approval documents was there a long-run cost benefit analysis evaluating the 2 treatment options of wall versus buy back and restoration. No fuckers complained about the rebar reef. It's going to be interesting to see how it holds up after this weekend/early next week with another round of resonably solid E/NE cyclone swell hitswho's going down to take more photos and show the aftermath?!! Te Puna Aonui is the joint venture of government agencies that will deliver Te Aorerekura. I can see everybody getting angry here on SN..but what are the solutions to seal level rise , Short term and long term. Ratepayer/taxpayer bailout, so business as usual whatever happened to caveat emptor? Construction costs are 80% homeowner funded. EDIT: Just to be clear, the issue of erosion has nothing to do with sea level rise, climate change, or buying the latest board. Mentioned in a previous article (linked below) - the region hosts submarine cables, so it's part of the Northern Sydney Protection Zone. Anyone who has been to Chiba in Kanto will have seen the Tetrapod formed surf breaks there. Action: Casey Johnston to forward initial site visit details to Taskforce members, noting there will be a further site visit as the project progresses". I suppose there are still those with more dollars than sense, but for me, the land is as good as built below the high-tide mark. You shouldve known by 1990. The fact that an engineer/s designed this crazy-ass wall is the concern I raised. My parents in NZ were excited when they took out bloodymangroves at the mouth of the estuary where they lived. They were concerned the sand directly in front of the seawall would be washed away, eroding their beach, and, on Tuesday, that's exactly what happened. 1. We can mess things up in a colossal way, and then keep doing it repeatedly. An "Engineer/s" designed this monstrosity and other "Engineers" approved it. Here's a screengrab from the website about the proposed breakwall extension: It seems that the main concern about the extension is the interruption of the natural flow of sand onto Mooloolaba beach and hence increased erosion risk. First and foremost they say It's for erosion control but as you've seen after 2011 they did pretty much sfa. Though with 80 properties at risk, and coastal real estate prices at a premium, they gave up on that approach in 2007. It appears that because of the relative lack of access to PC, the equation would be out of kilter to begin with. Angus Gordon, an engineer with fifty years experience in coastal engineering, assumed the same. LGA's apply for state and federal funding on offer for range of purposes. If you are referring to Vertical hard structures then that needs to be specified). the hardest decisions should be the easiest. Some interesting papers about building seawalls and the effect it has on risk perception in the post Tsunami context in Japan: Littlejohn (2020) "Dividing worlds tsunamis, seawalls, and ontological politics in Northeast Japan" More than double in wealth the last 7 years. It has to be worth a look. increases social amenity". First it was a track. This has cut into the base of the dunes below the surf club. Thanks Stu, didn't even know such a thing existed here. This is a massive issue around the world from which there are countless learnings. Theyve introduced these gently sloped walls to broaden the widths of the roads to protect them from erosion. Im just saying its a difficult issue, beachwall terrible and if its sets a precedent huge chunks of the coast stuffed. Would be very interested in knowing what other options were considered and why they were discarded Yeah it's easy to get caught up in the house situation, but the road is at exactly the same height and built on sand too. There is no better option. Well, it (and a lot of us) could possibly be in for a real test within 3-5 years with the Thwaites Glacier (Doomsday Glacier) suggested to be at risk of sliding into the sea and potentially raising sea levels by 65cm. I'm a huge tree-hugger but they will not stop powerfull ocean waves. >>Is that because he has been paid already?? Yamashita (2020) "Living together with seawalls: Risks and reflexive modernization in Japan". lilas Manly Hydraulics did the work which was used for the initial design but I am not so sure about their input on what was finally constructed. Surf Breaks Inc. Coming to a beach near you ! They must only exist on a dense (and expensive) schedule of maintenance, no doubt. The point i guess im coming to is, and i know an old couple whose property is very exposed to this issue, who have lived there since 1960's and are now in their 80's and likley won't see the impeding issues in their lifetime - but really they have done nothing wrong, bought an old shack in a place they love when no one lived up here, I wouldnt say there are a lot of people left like that but there are a few I know up here a version of that and the whole "screw those rich pricks" mantra is just divisive. The whole buy back argument being too expensive is a crock of shit. As hostile native rescue party moves in for the killOh the Humanityreads Humilityreads Kook! Perhaps at best, the council acquires the land and owners get a sum to relocate to a 'normal' house west of Pittwater Road (god forbid). Your browser has JavaScript disabled. Joint Venture adopts new name, Te Puna Aonui. I guess that the levees will give me a 100% guarantee that it'll never happen in my lifetime". This is not a defence of the structure or the owners, just recognition that the protection of the main north south artery on the northern beaches was a factor. Their email is: [emailprotected]. Both Brendan Donohoe and Angus Gordon, and other people Swellnet spoke to, admit to being blindsided by the construction. The question is why did the owners go for such an unattractive solution that by all appearances seems to have blocked their beach access. The Collaroy seawall was in part constructed after a significant storm event in 2016 eroded 50 metres along the Narrabeen and Collaroy shoreline, causing damage to waterside properties. Perfect future film location for backwash kook of the day. Spot on. For the swellnet readers here's some background info, and here. I imagine the ocean will eventually claw away under and around and over the structure. Collaroy sea wall. It will still be a bargain now compared to 60 years from now if they do the same. Separately at the Collaroy pool end of the beach when the walk way became unstable they just craned in these massive bags of rocks on top of each other and said job done - ugly as fuck. Guess where that temporary rock wall has ended up! It breaks my heart. That's the most sensible thing I've read so far. Much bigger. Hear, hear! By doing so they have encouraged similar management intervention from beachside landholders by 1. demonstrating part liability for coastal erosion processes by building such a structure that threaten adjacent properties and 2. I have a blanket policy of not feeling sorry for people owning properties worth multiple millions of dollars, who have lived the better part of their lives walking from their beachfront home directly onto the sand. The option of do nothing seems to have passed but it can always be thrown in as a baseline. If that is to be avoided there needs to be a concerted effort to gain the support of the wider NB community to create pressure on the council to develop a more acceptable plan. I'd imagine brendan and surfrider will have that covered. Hourly Multiple Swells Wind Highlighting Model Units ft, mph. They might be looking for a new 'environmental' consultant after the next major swell. It's corrupt to the eyeballs and the only winners are the crooked pollies and the dodgy construction companies while the once beautiful Japanese coastline is lost forever. Honestly he might be correct based on the Manly erosion hahhaa. Collaroy Sea Wall Client: Citilink Piling With such close proximity to the ocean, our client tasked us with producing an alternative to the commonly used polystyrene forms. The first application for a sloping structure was widely publicised and accepted by most who saw it. No-one wants to see visible structures built along the beachfront. Also, ALL the Numerical modeling was done in comparison to the current altered beach-state and NOT to a natural beach-state so there is bias in modeling things that way even though the beach state is not natural any more. good pics there willi, hadn't realised this. Thanks Lilas, totally get where you're coming from and taken on board. So where public assets like roads are involved things get really sticky. From deep state secret spot to modern media darling, what lessons can we learn from Cape Solander's evolution? Northern Beaches council has received a new application by five local property owners to build two new sections of the wall in front of their properties to protect the homes from coastal . Rad demo john interesting as Craig said to see the changes in shock waves returning seaward. [ask GaryG] For a couple of furlongs it was quite close to the ocean but nobody cared. I do know the metro area was excluded from the NSW Coastal Policy for a long time because it was seen as too difficult, and that the CLPS was focussed on environmental values. What a pity as the potential for offshore reefs around there is really good. This paper by John Corkill is worth reading if you're interested - he's a legend. A "macabre" scene greeted surfers followinga mass kill of invertebrates. Willi, how would easterlies impact the Great Ocean Road coast? Whether concrete castles or sand castles, buildings that close to a sand shoreline must be living on borrowed time. He said when the work is complete, sand will be pushed up to cover most of the seawall. nothing that a annual maintenance fee paid for by the taxpayer can't fix. The project is part of the 1.3-km seawall proposed from South Narrabeen to Collaroy to protect both private and public assets in the suburb. That's a form of speculation I believe. Hence, they are of no market value to me. there is no excuse for purchasing a property on the beach in the last 30 years let alone 5 without an inkling of understanding of the risks. As you know we have the Great Ocean Road down here , which was a huge Tourist attraction ( before Covid.) They are trying to protect a life saving club, which footings lie directly on the sandunes that eroded due to not only the waves but also the changing in direction and position of the mouth of the river (natural process). Planning Minister Rob Stokes told the Telegraph there was a recent plan to build a sea wall in Collaroy at the scene of the devastation but the owners would not agree on making a contribution, so it never happened. Among many objectives, it outlines how people living in threatened property might defend their homes. (9News) But the structure has divided locals, with many describing it as an eyesore, and there are concerns it may wipe out the beach entirely. Wow, that is ugly even by brutalist/modernist standards. The council will buy me out at any price if things get too hot". Damaged houses and a collapsed swimming pool at Collaroy beach after waves of up to 8 metres hit the coast on June 6, 2016. Anybody heard of rising ocean levels & retreat by wealthy landholders who where allowed to build in the dune systems which nature designed to replenish the beaches? Make his name famous: Peter Horton. Vertical Seawalls Vertical seawalls are exactly what you think. Water is manageable but comes with a huge expense and loss of nature. However, theres an irony that could've beenliftedstraight out of a script for Utopia. Ben, yes there are submarine cables and the protection zone is there to prevent damage to the cables, but I don't think that would preclude construction of reefs, it just means that any proposed reef design/construction would have to be in consultation with the cable authorities. I doubt there will be a demand for the effected given the inevitable. Imagine the carnage during the next ECL. Hi Mark. The most notable benefit of sea walls is that they provide excellent protection against coastal erosion and flooding. Death of Her Majesty Queen Elizabeth II. A northeast swell generated by ex-TC Seth off Queensland,. Not sure why coastal ginger beers (engineeers) assigned by local councils just keep getting it wrong, but it would be fascinating to go through the meetings minutes of how these get passed, and the deceptive and misguided arguments that must be being put forward. But, I think its just basically supply and demand. Not to mention the many brutalist houses dotting its once beautiful headlands. besides Id rather just shout at my computer. They have just completed digging out a new path for the river to follow with excavators and every day Id watch the next morning after high tide their progress would seem effortless and the river would tend to follow the old direction. Thanks, Lilas, I agree with there being challenges inherent in generalising, but I'm going to resist the temptation to take our shared pedantry down the rabbit hole this time! I mean, did someone forget about the old idiom about 'shifting sands' or what? Kook survives a brutal seawall bashin' well almost! Collaroy seawall project | Protection from coastal erosion Watch on Location: Collaroy NSW Our specialist staff were engaged by the Northern Beaches Council to construct the 250m rock revetment seawall in front of the Collaroy Beach carpark. There are plenty of other spots along the coast vulnerable to rising seas and more intense storms but Collaroy is one of the most difficult to address. Be interesting to know whether the assumptions for the modelling included any information on the value of the beach to be lost, belly. RAW footage from this week's extra-large swell at Peahi. So fkd how big some of those sea walls are and just ruin the towns completely and those that rely on the area, Theyve done the same thing to much of Taiwans coast, see eg: http://www.irjes.com/Papers/vol6-issue10/F61012431.pdf. @Tango Though not failsafe in extreme events, isnt it amazing how reefs and well-place gabions somehow protect small atolls in middle of the ocean for most of the time? 47 votes, 47 comments. "Environmental vandalism or gross negligence?". Now a 7 metre-high, concrete, vertical seawall has been built in front of private properties on Collaroy/Narrabeen beach. A development application (DA) before Northern Beaches Council would see two additional sections of vertical wall built 50 and 30 metres in length straddling the South Narrabeen Surf Club. what's the logic/law in having to buy back the properties ? A weather-beaten cement plaque with the year 1952 is still visible along a section of the seawall. GCCC's approach protects both private property and public beach amenity without any visible structures on the beach. Collaroy Seawall Detailed Survey for construction of a new seawall in highly sensitive erosion zone. Lets do the modelling and begin building offshore wave traps and manmade surf-breaks. The owners of those properties must have the most amazing collection of dirt on the political class. This seawall will not only protect our homes but also Pittwater Rd, and the many communication and public services installed under it, from inevitable future storm events. I recently tested an Open-Source Wave modeling software called "Celeris" and the result are really good although I didn't go too in-depth with it. With increased ocean levels comes all those properties around Botany Bay, Parramatta river, Georges river. It pisses me off that people wilfully or ignorantly choose to buy in areas that are not for purpose, enabled by the property industry and then scream out for taxpayer help when the inevitable disaster occurs. The engineers would have likely argued against this for the reasons given above (and then some). And please take a look at all the other ridicules things Coastal engineers are doing around this country so you can see the pattern of incompetence I am referring to. Including the residents behind the great wall. Adjacent a second wall constructed just to the north, the half finished revetment was torn to rubble with dangerous rebar, boulders and cement being washed into the surf zone. Both!! Their ultimate solution was a combination of 3 things- a rock boulder seawall buried in the dunes as a final line of defense in extreme erosion events to protect private properties behind (this seawall actually runs for the full extent of the Gold Coast nth beaches but is rarely seen as it is completely buried under dunes/vege), an offshore reef, also rock boulders, to attenuate wave energy under normal conditions thus widening the beach in its lee, and lastly- sand nourishment, adding more sand to the beach system. Photograph: Lewis Isaacs/The Guardian Beachfront residents back. 42 online submissions ALL supporting the wall but many seem to think it would be a sloping rock construction. She had reigned as Queen for 70 years. If a construction like that ends up being the only realistic option then so be it, but at least they need to be transparent about how they got to that point, and ideally accountable in future if it goes south. An increase in storm activity - particularly from the east and north-east, as has been proposed by Associate Professor Ian Goodwin - and the looming threat of sea level rise are X-factors for East Coast beachfront development. [Just like in Hawaii] What they fail to mention is the massive corruption that's involved in awarding these contracts and the fact that the construction companies themselves for the most part, are predominantly Yakuza. Could be the camera angle but. Perhaps the omission was because in 2002, protestors, led by Brendan Donohoe and Surfrider Foundation founder Tom Kirsop, formed a line in the sand stretching from Collaroy to Narrabeen opposing the construction of any seawalls. Sorry to go hard on your story like that but I feel we need to keep the science at the forefront of all coastal engineering discussions. Records show the DA for the Collaroy Seawall had been lodged 18 months earlier in July 2018. This issue is not exclusive to the NB or sea level rise or storm surge. More often than not, the pollies retiire and are parachuted onto the boards of these companies and live out their lives having enriched themselves quite nicely. But, they just persist time and time again. brutus Collaroy was not a typical situation. The seawall is probably built over them. They have access to and use a large suit of software modeling tools, but unfortinately a lot of them don't have outputs that non-scientists can get their head around [just numbers which are meaningless on the surface unless you understand what they represent.] In 1974I witnessed what cyclonic ocean power can do to ignorantly planned beach development 50 years on and a lot of sea miles under my belt. The angle of any hard hard structure relative to the wave direction is what really matters, so you can see why it's important to be very specific when talking about science/engineering. Perhaps the omission was because in 2002, protestors, led by Brendan Donohoe and Surfrider Foundation founder Tom Kirsop, formed a "line in the sand" stretching from Collaroy to Narrabeen opposing the construction of any seawalls. The Collaroy seawall was in part constructed after a significant storm event in 2016 eroded 50 metres along the Narrabeen and Collaroy shoreline, causing damage to waterside properties. property owners in Collaroy have seen the value of their asset increase by around 20-30% in the last 12 months alone. And as I said in my first comment that is because of the road. The market knows the insurance companies know this. Could be some good entertainment next time some serious swell hits. You have a decade of good conditions somewhere along the way and everybody builds on the beach or on a river bank and then there reminded of the risks being swell generated by a low and annual big tides in cyclone season who woulda thought ..or flooding by jingoes fuk wouldnt you rather walk an extra couple of hundred metres and leave nature to do what it does . stupid white poeple ..classic. I like the cut of your pedantic job, there Lilas. Comparing the swell to those of last year it wasn't of any major significance but it shows the futile efforts trying to protect property with a hard structure. The politicians and land owners actions are an entirely separate discussion and I'm not entering into that minefield! Step 3: Calculate the number of pilings that will be required. Maybe you New South Weleshpeople do things differently. Point being that the experiment is a gimmick as it would be quite easily modelled in a software program given all geometric surfaces and the regular wave pattern. check out the beach erosion in Apollo bay as well The lessons, it would seem, are still being learnt. That means that the Feds have all the money, the States some and the councils bugger all. For those who may not know, the private land issue is complicated in NSW in particular (less so in other states) by the existence of ambulatory land boundaries which are set at various levels of the tide eg mean high water. With the benefit of ignorance, having not seen the actual plans, I'd be surprised if the foundations were able to fail easily as I'd expect they'd have been designed explicitly to avoid it. My working assumption is that they have behaved unethically on this matter. Good balanced post tango. It would have been a bargain 20-30 years ago to buy the properties and return the space to the public for the purpose of more effective less intrusive, natural and cheaper remediation efforts. I posted links to the relevant council pages in the previous story. I just can't see HOW these monstrosities ever get approved, purely on an engineering level. When deciding to spend rate payer dollars, on what metric do they use without using the big IF ? It is worth remembering that this council, as Warringah, council, was twice dismissed for corruption and incompetence. Done well they could create added atmosphere to the beach life we love to live here for. Spot on tango. Given that it seems to fly in the face of best practice, has anyone asked what the NSW Coastal Council has to say about it? On Saturday November 27th hundreds of locals came down to Collaroy Beach / North Narrabeen Beach in grim weather conditions to protest the monstrous 7 meter . Ray Collins eat your heart out.. Good find. Collaroy Park Estate Narrabeen: Sea View Pde, Beach Rd, Collaroy Ave, Main Pittwater Rd, Govt. Maybe "Collaroy" is the aboriginal word for "Stupid White people"? Go figure! https://eservices.northernbeaches.nsw.gov.au/ePlanning/live/Public/XC.Tr And this (Item 4) gives the reasons they changed to a wall. July 28, 2021 - 7:04AM. Photograph: Northern Beaches Council Library Local Studies. But there will also be a range of other social and environmental grants on offer that the LGA will use to leverage off for on-going maintenance. I wrote to Many Hydraulics Laboratory to ask for the details regarding the sea wall assessment they produced.
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