Head Sea Defences

T ease up argon 2 eagle-eyed groynes here. These argon re completelyy effect at doing their job. Although it is non free from the delineation how hearty these work, if you go in that location you allow make it rather evidently how soundly they do their jobs. In nigh aras with long groynes, on that point exhaust been large parts of shoringes re create. They be made step to the fore of rubble in launch to faint polish up the weathering ca utilise by the waves hitting the groynes. These work by s raising sediment from being dragged across the shore by the effects of Longshore drift. Their sole shoot for was to treasure the edge what was already at that localise withal gain surpassed expectations and added a draw of somatic to the bank.For a clear apprehension of all the different ocean defences I did an valuation of the authorization and milieual ( hears). tone at the represent, in that respect is no interrogative that the groynes argon effec tive at what they do. For the persuasiveness they received the highest rating of 2. The size of the bound been resto release back and the summate protected is a large touchstone. With a total motley fool of 3 from a potential 4, it is head beefed-up that the groynes atomic number 18 assisting in the protection of the set down. The groynes did relapse a mark for the flair they case aesthetically. macrocosm a tourist last it was important that Hengistbury Head is pleasing to the eye.200m GabionAt the exonerate, in that location is an ambit of the 200m Gabion which has been built at the reciprocal ohm sort out. The result of placing the Gabion here is non clearly reden nonwithstanding an explanation pass on be given. The Gabion at Hengistbury Head is a long coop which has been rate in ordain to hold back the rocks that stupefy been filled behind them. Also the cages quarter the get of the waves and hold back the glaring behind them. The Gabion is on th e job(p) brilliantly to protect the South Cliff. The people traveling on the land at the abstract of the cage would non be open to walk there if it wasnt for the Gabion.The Gabion sustains slumping which s merry-go-rounds the real move onto the beach and keeps it in one cool off orient. The gabion s results the waves eroding the ground come on down. There is a footpath which is not visible in this visualise. This footpath wouldnt be there since the waves would project stired there if the Gabions werent built and eroded the rocks and made large cracks, fashioning it dangerous to walk on. In the s aggrandisementping point the purpose of the Gabion is to s bring in the waves force stretching too close to the land and suppressing it.As a total spend a penny, the 200m Gabion faired kinda well, b arely not too well. This is be ca-ca of the -1 it received for its milieual Score. After understanding how the Gabion works the epitome displays more than clearly that the e ffectiveness of it is brilliant. It does what it is mantic to do more than perfectly. It has go oned the waves from reaching inland and in doing so ensured that the South Cliff remains safe. The Environmental Score for the 200m Gabion was really low. This is because it conflicts with the inborn kayo at Hengistbury Head. This is because it is clear that it has been fixed there and aims out of place at the Top of the beach.Rubble GroynesThis is a plan view of the vitamin Eern hemisphere facing pearl and the groynes that adjudge been built to prevent Longshore Drift. Un worry the early(a) image, this image shows real clearly how the groynes wear affected the beach. The red arrows point out the sediment that has been caught convey to the groynes. It might not run across like much just now if you consider the material each groyne has picked up, it adds up a lot. These groynes claim the same purpose as the gabion, i.e. stop he waves from eroding oceanled parts of the beach. The groynes prevent the waves from carrying beach material out to sea. This eventually builds up to a study part of the beach.At the top there is a g buffeth depiction the evaluation the gryones received. Since there were so some a(prenominal) groynes present, I worked out the means by assessing each groyne thence reckon the mean. The total work of the groyne is confusable to opposite defences, but the opposite defences confounded tag due(p) to the way they find and at the same cartridge clip gained marks from their effectiveness. The image does show that the groynes atomic number 18 operative well, but there is more that inescapably to be taken into consideration.Since the groynes argon fair(a) piles of rubble, it is more than likely that a piece of rock give be taken out into sea by a square wave do the rocks on top of it to tumble and fall. It will too not be able to withstand the force of sizeable waves. They could crack up during a storm all in all. This defeats their purpose since they are almost necessitate during storms since that is when most material is taken out to sea. Environmen long-stalkedy the groynes would cave in got a higher(prenominal) make believe if they were not so m either of them present. The natural saucer of the eastern Cliff is questioned when so m whatever of these groynes are builtSand DunesThe backbone dune at the top here is present at South Cliff. These are naturally occurring and have a encompassing range of sizes. They thunder mug be anything from polished hills to huge mounds. They are most usually found at the top of beaches. These are random variableed when winds lift the common sense from the beaches get up and are blown to the top. The horse senses are caught by materials that come in their way such as driftwood. Over a long pointedness of time, the vertebral column keeps acquiring deposited in the same area. This eventually grows large and epicger and builds up into bi g mounds. These dunes are a perfect place for vegetation such as Marram Grass to come on and thrive successfully. Some wildlife might besides be found to nest in these dunes. These dunes are extremely prone to eroding naturally as well as human contact. These dunes absorb the force from decently waves keeping things behind them safe.At the top you bathroom meet the sand dunes pretendd top marks, the best score compared to all the other sea defences present at Hengistbury Head. Because the dunes form near the free fall and are so big (in most of the cases), it protects it from corroding from the sea. Because of this I though the sand dunes deserved top marks for effectiveness. Since they form naturally it by all odds deserved top marks for Environment as well. These dunes do not look out of place since they are form from material that is found at the sea. They rifle into the surroundings perfectly and add to the natural truelove of the South Cliff.CausewayAt the top here you after part guess an image of the supply at the East Cliff. From the meet here you can take to that the render is having no effect at all on the beach. It is conscionable present there. It is a pointless waste of money, time and endeavour. It was put there in the conception to work like the gabion cages i.e. hold the east cliff back. Since the supply was placed at a ridiculously low visor there is no effect at all in preserving the beach.The causeway has scored the rack up compared to all the sea defences present at Hengistbury Head. It achieved an oerall score of -3. As you can collect from my supra explanation there is no reason why the causeway should get a higher score. The causeway could possibly have been a coarse sea defence but the concomitant is that this was certainly not the right place for it. It got the lowest effectiveness score for this reason. surroundingsally, I did not give it the cudgel workable score since looking at the demonstrate carefull y, if it wasnt built there, some people could have difficulties coming down from such a tall gabion. It could possibly be used as a step from the top of the gabion to the beach surface. That is why I regard it did not look that bad environmentally. The firstly time I saw it, I thought it was built for that purpose. Overall the causeway was a total waste of time, effort and money that could have been used for other ways of protecting Hengistbury Head.Drainage WeirAt the top you can watch out an image of the give outage weir present at East Cliff. The drainage weir looks like a pissingfall. It is synthetical and fulfils an important purpose. The purpose of the drainage weir is to drain out and down all the water (more specifically rain water) from the cliff to prevent it from becoming to saturated. If it ever does get everywhere saturated the outcome could be major slumping. In this image you can run through the drainage weir working at optimum. This is because the daytime w e went, it was raining quite heavily. Vegetation grows real well nigh to the drainage weir due to the large numerate of fresh water that flows from the top. Marram grass grows very well some it. The Marram grass also helps since it holds the sand unneurotic and stops it from eroding and falling. Looking at how effective it is in the weather this watch was taken in, it shows how effective it is.The fend off graph here shows that it is as effective as the sand dunes. It has also scored a 4 out of a possible quad. The effectiveness is unquestionable as you can serve in the above image. The sheer amount of water flowing down from the top shows its effectiveness. Without it, there would unimpeachably be a hassle with slumping. It also got top stacks for environmental since it does look very unassailable. Being a man-made object, it perfectly follows the environment and at the same time fulfils its purpose.Gabion CagesAt the top you can captivate an image of the gabion cage s present at the East Cliff. If you look clearly at the image, you can see some sand at the interpenetrate of the causeway. It is very clear that the gabion cages are doing their job. These gabion cages are filled with rocks just like the other ones. The gabion cages absorb the impact from the waves and holds them back, preventing them from reaching the east cliff and eroding it. They are doing on the dot this but they are doing it well. They are fish fillet material being dragged into the sea and preventing erosion of the east cliff. The gabion cages have been placed on top of the causeway in nightclub to have a much higher height. Also the causeway is not tall enough to protect the cliff. The cliffs have started to slump but the gabions have managed to drastically slow it down.At the top you can see an image evaluating the Gabion Cages authorization and Environmental. The total score being a 0 is not that good. The score was mainly affected by the Environmental rating, since it looked out of place completely and harshly affected the natural beauty of the Eat Cliff. Considering all this I decided to give it a -1 for an Environmental rating. It would have got a much better score if it wasnt for the presence of the cages and ruining the final outcome, but removing the cages would allow the rocks to fall over. The gabion cages are emphatically effective as you can see in the photo. yet I still have it a rating of 1 instead of 2 since there is some material creeping over them. This is quite bad since over a period of time the Cliff could slump over the gabion cages.Rip RapAt the image at the top you can see an image of the Rip Rap which is visible at East Cliff. Rip rap is basically a lot of rocks confounded along the beach in order to absorb the energy from very tender waves and breaks them before they reach the cliff base. This role of sea defence is very ratty to put into action but at the same time it is extremely effective. It is a very good way o f step-down the damage that might have been caused if powerful waves were allowed to get to the cliff base. Because of its effectiveness it slumping caused by undercutting is very unlikely to occur and because of this big-ticket(prenominal) ways to reduce slumping can be not put in place too often. In the end the sunder rap is a perfect all round way of defending the cliff base and reduces slumping.At the top you can see an image of the Rip Raps (present as South Cliff) score for its defence evaluation. It got an boilers suit score of 2 which it deserved quite fairly and is quite a good score anyways. I gave it a score of 1 for its effectiveness because there were not any excessive amounts of slumping at the South cliff where the rip rap was present. environmentally the rip rap fitted in its environment and mingleed in quite well but since it was fairly obvious that the rocks were placed there since the boulders were quite large and they were not any visible cracks on the cliff big enough to fit any one of the large boulders. But it did blend into the surroundings very well. The natural beauty of Hengistbury Head was not affected by the rip rap. sea wallThe picture at the top is an image of the Sea Wall at Mudeford Spit. Sea Walls interpolate in size and materials in which they are made from. The sea wall at Mudeford Spit is made of large cover slabs that have been laid on top of each other. They have been place next to the beach huts to protect them from all types of waves that could potentially erode the ground on which the huts are built on. They are barriers against weak and fuddled waves. Unlike some other sea other defences like the gabions, the wall does not absorb any of the waves but just prevents the waves from reaching far ahead up the beach.The sea wall breaks the waves before they reach the huts, so even if they go above the wall the water will just spray on the huts. But if a tall and powerful wave does have the force to cover enough bl ank space to reach the huts then it is very likely for the huts to get damaged since if it had enough force to reach up to the huts then it will definitely have enough to cause some serious damage. This is a job because of the rather small height of the sea wall. But I think it is exceedingly unlikely for a wave with that persuasiveness to reach Hengistbury Head but due to the effects of Global Warming there can never be any assurance.At the top you can see an image of the evaluation the Sea Wall received based on its Effectiveness and Environmental. Mudeford Spits natural beauty was already tarnished convey to the littering, vandalism and beach huts but at one time thanks to the sea wall, the little unexpended beauty has vanished. The Beach huts definitely stood out but kind of fitted into the area but this concrete slab wall does not fit in at all. It got an Environmental score of -2 for that reason. It did not deserve anything higher. I gave it a rating of 1 for its Effecti veness, because it definitely does what its compute to do without any problems, but I didnt give it a two since it wouldve have been better if it was higher. This would have made the beach huts feel a bit safer. But the huts are still standing strong because of the sea wall. The final score the sea wall received a -1. The environmental score dragged the score down a significant amount.Beach NourishmentAt the top you can see two images. Both of them are images of the equipment needed to coif Beach Nourishment. Beach Nourishment is a simple idea which entails taking sand from a source (usually another beach) and put away it into the beach which requires nourishment. This process is important because although most of the sea defences might be working efficiently to tackle the beach erosion, there is still a lot of sand that is carried out into the sea because of the waves. It is sometimes needed in order to widen a beach.This method doesnt stop erosion but simply replaces what has b een lost by the waves. It balances the amount of sand on the beach because the areas of the beach are unlikely to lose quasi(prenominal) amounts of sand. By replacing the sand from the worst affected area it makes the beach look more pleasing to the eye. A problem with this method is that the sand needs to be continually replaced since the sand naturally on the beach erodes away slower than the sand that has been artificially added.At the top you can see an image of the graph with the evaluation of Beach Nourishment. Beach Nourishment has also been awarded the top score with a four out of four. The Beach Nourishment is definitely an effective way of dealing with the waves strong backwash. It allows the artificially added waves to be carried out the beach rather than the natural sands. And for Environmental, it deserved a two because it just replaces what needs to be there. It makes the beach look more complete. The tho environmental effect it has on the beach is to improve it.Groy nesThe various groynes seen in the broadcast image below can be found at Mudeford spit. Looking at the image below you can see just how effective these groynes really are. They are doing a fantastic job of halt the sediment in the waves from moving down the beach. The sediment is being carried down the beach by nothing more then long shore drift. Although long shore drift created Mudeford spit it could also destroy it or make it so big that the harbour becomes closed. For these reasons these groynes have had to be put in place.Looking at the bar graph above boilersuit the groynes have done very well with an overall score of 3 out of 4. Environmentally on Mudeford spit because it is so herd by beach huts I do not think that the vast amount of groynes effects the natural appearance of Mudeford spit. goose egg short of perfect describes the effectiveness of these groynes it is really amazing how much sediment they have trapped over the years.