http://www.virtualswanage.co.uk/community/forum/ 60 http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1169 And to let you all know how waves are made please read the following below How Waves are Generated Apart from special waves such as tsunamis, the only thing that produces the waves we see on our coasts is the action of the wind blowing over the sea surface Waves arriving on a coast can be generated by local wind, in ‘real time’, in which case the waves are called windsea, or they can be the result of a wind that blew over the surface of the ocean thousands of kilometres away, up to several days before, in which case they are termed swell or groundswell To produce waves, the air moving over the surface of the water has to somehow transmit its energy to the water Just how this happens is a very complicated process, still not well understood The most accepted theory is the one proposed in the 1950s by J W Miles and O M Phillipsquot the Miles-Phillips theory The theory describes how waves are generated from a flat sea using two mechanisms the first of which produces tiny ripples called capillary waves, and the second of which produces bigger waves called gravity waves those we ride According to the Miles-Phillips theory, capillary waves first begin to grow from an entirely flat sea, and then gravity waves are subsequently formed from a sea already containing capillary waves Gravity waves and capillary waves are named as such because the restoring force the force that returns the sea to an equilibrium position after the wind has lifted it up is gravity in the case of a gravity wave and capillary action, or surface tension, in the case of a capillary wave The initial generation of capillary waves is due to perturbations in the surface wind, causing irregularities in the water surface The wind does not blow completely horizontally all the time it will naturally contain random disturbances that give it small vertical motions as well Sometimes, these vertical motions are enough to create tiny up and down motions on the surface of the water itself This is the vital beginning which triggers off further reactions and facilitates the flow of energy between wind and water Once the sea contains capillary waves, there is an increase in surface roughness, which allows the moving air to ‘grip’ the surface of the water There is no longer any need for small vertical perturbations in the air flow the horizontally-moving air will now push up the existing bumps in the water surface This second mechanism is self-perpetuating the rougher the surface the more ‘grip’, the more grip the bigger the waves, the bigger the waves the rougher the surface, and so on While the first mechanism causes the waves to grow at a rate which is linear with time, the second mechanism is exponential with time the bigger they are the quicker they grow The restoring force of these bigger waves is now gravity, not surface tension Eventually a point will be reached where the wind can’t lift up the surface of the sea any morequot the force of gravity pulls the water back down again at the same rate as the wind lifts it up This natural limit is reached for a given windspeed, so, if the wind gets stronger, the waves will get higher [img]http://images magicseaweed com/news/444 jpg[/img] Wave height as a function of time: The first part of the curve shows the waves growing at a linear rate with time, then the second part shows when gravity waves take over from capillary waves and they start to grow exponentially Lastly, the waves reach saturation point for a particular windspeed and the growth curve tails off Where does the wind come from to generate the waves To produce waves big enough to surf, all you need is a reasonable strength wind blowing over a fairly decent stretch of ocean for a good few hours It doesn’t really matter where that wind comes from In fact, it can come from a number of different phenomena for example, a tropical cyclone where surface winds of immense strength blow around a tight centre a long, straight zone called the trade-wind belt, just to the equator-side of a large semi-permanent high pressure a local wind on the coast called the sea breeze which blows in the afternoon to equalize a surface pressure difference caused by hot air rising off the land, or a monsoon which is a kind of giant sea breeze But probably the most important phenomenon for producing the waves we ride is the low pressure, sometimes called the mid-latitude depression A low pressure is just a cell of air on the surface whose pressure happens to be lower than its immediate surroundings To try to equalize this pressure difference, air will try to flow from outside the low in towards the centre, in other words from high to low pressure However, because of the rotation of the Earth, this air will tend to get steered to the right in the Northern Hemisphere and to the left in the Southern Hemisphere As a result, the air around a centre of low pressure will end up circulating in an anticlockwise direction in the Northern Hemisphere and in a clockwise direction in the Southern Hemisphere Note that the direction of rotation of air around a low pressure is always called cyclonic, regardless of hemisphere The exact way in which a low-pressure system is formed is also something that scientists are still struggling to understand A simple explanation is as follows: They are born initially from small disturbances in the atmosphere Given the right conditions, these small disturbances can grow into large ones The initial perturbation must be something that causes a local drop in pressure, and one thing that can do this is the meeting of two air masses of different temperatures and hence pressures The warmer lower-pressure air will tend to slide over the top of the colder higher-pressure air, producing a forced local drop in pressure at the surface If all the conditions are right, the rising air will start to spin, sucking in more air from the outside, lowering the surface pressure further, and so on until the system grows into a full-blown mid-latitude depression [img]http://images magicseaweed com/news/445 jpg[/img] In an effort to equalize the pressure, air tries to flow directly from a high pressure to a low pressure, but the Coriolis force causes it to turn to the right As a result, the air circulates clockwise anticyclonic around a high pressure and anticlockwise cyclonic around a low pressure Note: Northern-Hemisphere systems shown in the Southern Hemisphere, everything is reversed David Furmage Wed, 14 May 2008 00:37:01 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1164 Out in the garden last night seen a couple of bats flying around David Furmage Wed, 14 May 2008 00:32:19 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1169 And the condor surge , well we surfers want a surge as it brings in a bigger wave:P David Furmage Wed, 14 May 2008 00:30:17 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1170 [quote] On 13/05/2008 09:38:19 MikeHadley wrote: how to successfully build a local supply of quality produce to reduce food miles, carbon emissions and limit the effects of global markets Edited: 13/05/2008 09:50:11 [/quote] Not much chance of this when I suspect most of us buy our shopping online from tesco#39s and Asda And I have found that most of our local suppliers of meat, fish , veg charge more than if I was to buy from out of town :O David Furmage Wed, 14 May 2008 00:28:33 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1168 Ok simple idea for the council and the meetings Have the meetings at a resonable time where anyone can make them Not a 9 30am or 7 30pm David Furmage Wed, 14 May 2008 00:25:25 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1169 Thing is with the reef in bournemouth , it will need a swell to make the waves , and with Swanage being situated as it is the only kind of decent swell we get is on SW swell It has to be a big storm for it to wrap around Peveril point and come into the bay Apart from that it will serve as a home for fishes and other sealife Please folks dont think that putting a big lump of rock out in the bay is going to make waves , cos it wont Oh and Mike it will do no such thing , protect visiting boats in the summer and winter : the only thing to do this will to be build a marina Edited: 14/05/2008 00:19:45 David Furmage Wed, 14 May 2008 00:16:53 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1171 [quote] On 13/05/2008 18:10:01 paulinho wrote: That#39s a pretty good price ! would you be able to delivery locally ! [/quote] I can deliver them locally if needed webmaster Wed, 14 May 2008 00:02:43 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1170 [quote] On 13/05/2008 22:13:14 Dorothy wrote: and please note you will have to be affiliated to or be involved in certain sectors, it would appear that this meeting is not open to one and all [/quote] Bit like council meetings then where you have to be in their club to stay :D swanagec Tue, 13 May 2008 22:27:15 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1170 and please note you will have to be affiliated to or be involved in certain sectors, it would appear that this meeting is not open to one and all Dorothy Tue, 13 May 2008 22:13:14 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1129 I thought that religious linuxes lini were an urban myth In any case the arguments about different OSes look too much like religious debates for my taste Can you get holy screen savers with little fish swimming across the screen I won#39t get into the darker possibilities of Hieronymous Bosch screen savers illustrating the fate of the unsaved as it were KLR Tue, 13 May 2008 21:32:13 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1174 Well I know some of you dont like footie , but one of my teams in playing in the UFEA cup final tonight , so I would just like to say good luck to them and COM ON THE GERS David Furmage Wed, 14 May 2008 00:49:47 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1169 I read with interest on the BBC website about the Surf reef that is being put in Boscombe bay, now not really being a surfer or having every tried it I#39m tempted by this ! Maybe we could have one down here in Swanage lol lol ! quotEurope#39s first artificial surf reef - which could attract 10,000 surfers each year to the south coast - will be ready by the end of the year Work to build the £1 4m reef in the Boscombe area of Bournemouth, Dorset, will take place from July to October The council has finalised its contract with New Zealand firm ASR Ltd to complete the project The reef is part of an £8m regeneration scheme in the area and is expected to create waves of up to 3 96m 13ft It is hoped the project will be completed by the end of October, depending on the weather, but the council#39s contract says the reef must be completed by 31 December 2008 quotat the latestquot The first shipment of materials will arrive in Southampton in June Bournemouth Borough Council has ordered 55 sand-filled quotgeotextile bagsquot, which will make up a reef covering an area the size of a football pitch The bags, which vary in length from 15m 49ft to 70m 230ft , will be transported from Southampton to an undisclosed location and assembled onto a webbing base They will then be taken by barge 225m 738ft out to sea to the east of Boscombe Pier Councillor Stephen MacLoughlin, leader of Bournemouth Borough Council said: quotThe deal has been done to bring the long-awaited surf reef to Boscombe to revive the area quotIt will be the most innovative sports and tourist attraction in the south quotThe public can be assured that the reef will definitely be completed at the latest by the end of this year quot [url]http://news bbc co uk/1/hi/england/dorset/7395951 stm[/url] paulinho Wed, 14 May 2008 00:37:01 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1164 Well they are back flying around A sign summer is on its way I just love looking up and seeing them flying around chasing little flies Not seen a swallow yet though David Furmage Wed, 14 May 2008 00:32:19 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1170 Swanage Chamber is supporting a conference on the 15th May 2008 in Swanage to look at the changing economic climate and what this might hold for Swanage rising fuel rices and the possibility of £2 00 litre by the end of 2008 the effects on the tourist trade which supports many businesses in the town how to retain and develop our workforce with new skills how to successfully build a local supply of quality produce to reduce food miles, carbon emissions and limit the effects of global markets Speakers include Gary Fooks, Dorset 2012 Legacy Manager Jenny Goldsack, Goldy’s Farm Shops Barnaby Quaddy, Federation Small Businesses Martyn Jenkins, Safe 2 Work Teresa Rice, Harmony HR To attend, please use the online form on the Chamber website http://www swanagechamber co uk/swanagefuture htm Edited: 13/05/2008 09:50:11 Mike Hadley Wed, 14 May 2008 00:28:33 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1168 Found the following on the councils website regarding the new manager at swanage bay view wanting to convert the skittle alley into a gym! ----------------------------- The General Manager outlined a proposal to convert the existing Skittle Alley into a Fitness Centre at an estimated cost of approximately £33,000 He reported that there was very little demand for the use of the Skittle Alley and felt that the area could be better utilised to provide additional fitness facilities A lengthy discussion ensued regarding the cost implications and viability of such a facility, and it was proposed by Councillor Mrs Patrick, seconded by Councillor Bright, and RESOLVED UNANIMOUSLY:- That a Business Plan for a proposed Fitness Suite be prepared by the General Manager and referred for consideration at a future meeting of the Finance and Performance Management Committee ----------------------------- From [url]http://www swanage gov uk/pdf/meetings/minutes-caravan_park-16_april_2008 pdf[/url] I think there used to be a gym fitness centre at the park a few years ago and it was scrapped as noone used it I wonder whos getting a backhander from this if it goes ahead swanagec Wed, 14 May 2008 00:25:25 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1171 I have a pair of kayaks for sale One is a Perception Dancer which has the extra leg brace kit fitted, the other is a general purpose kayak Both in red Complete with spray decks and paddles Ideal for the summer or winter! [img]http://www virtualswanage co uk/docs/kayaks jpg[/img] £175 ono for the pair Phone 01929421070 for more info or send me a personal message via the forum webmaster Wed, 14 May 2008 00:02:43 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1129 I have seen the future and its Ubuntu I have just downloaded the latest version and it installed on my pc 100% error free Video sound and network drivers all installed without any help from me, which is more than windows does I am converted to linux For the not so technical, Ubuntu is a linux based operating system which is open source, free and includes all the main applications you would need The Dreaming Void Tue, 13 May 2008 21:32:13 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1173 Starcraft 2212 Sports boat with cuddy cabin for sale Ebay item number: 140232767371 Lovely, stable boat with cuddy cabin, giving overnight accomodation for two plus occasional 2 under canvas Comes with twin-axle, galvanised road trailer New #3905 - never been immersed in water Turquoise and white with matching interior Black cockpit tonneau cover and full canopy in matching colour bright jade green New #3905 but like-new condition Loads more details on Ebay! Redmuffin Tue, 13 May 2008 17:41:33 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1172 I have a 7 6 feet Plastimo PI-230 Dinghy/Tender for sale Can be delivered to anyone local to Swanage area, if you are interested Ebay Item number: 140232761100 It is a lovely bright red colour, with oars Excellent condition and very clean - for 3 people Redmuffin Tue, 13 May 2008 17:17:45 GMT http://www.virtualswanage.co.uk/community/forum/topiclist.aspx?t=1105 Wanted: an inflateble boat e g zodiac or any other make with outboard engine thanks GuppyMan Tue, 13 May 2008 13:23:33 GMT