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Wave period  Rate Topic 
 
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 Posted: Tue May 10th, 2022 06:02 pm
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Bloks
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Good day all


I have been checking out windfinder and saw that the wave period is increasing up to 19 seconds on Friday and then it slowly decrease to 12/13 on Monday.

Now my question is, what effect does the wave period have on:

1. Beach fishing for steenbras and galjoen (My favourite)

2. The effect it has on Galjoen fishing on the bricks.

I have no idea what effect it has on any kind of fishing?

Last edited on Tue May 10th, 2022 06:03 pm by Bloks

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 Posted: Tue May 10th, 2022 06:41 pm
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DJP
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Short period good for fishing, long period bad. For me +13seconds starts getting long for fishing +15 seconds gets langbeen water., no good for most shallow spots. The longer period coupled with bigger swell means the actual waves/ surge will be much stronger, especially close to spring tides… just more water moving. Also the rip tides gets stronger. If the swell is large with long period swell it’s good for surfing, short period with a bit of moderate wind swell good for fishing.

Off deeper water spots the effect is less, but still evident. For galjoen specifically they don’t like it when to much sand is kicked up, the water can be strong and role but as soon as the waves kick up to much sand they are out of there. The steenies don’t seem to mind too much about the sand.

If you want to read up on this from a surfing perspective check out https://magicseaweed.com/docs/forecasting/66/ some great info to use for fishing. I’ll paste the swell period info just now.

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 Posted: Tue May 10th, 2022 06:42 pm
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DJP
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OUR FORECAST : WAVE PERIOD

1 - 4 SECONDS

Forget about it - this is swell so small and weak in the very early stages of being generated from strong wind that it can almost never be surfed. Sea in this state will look lumpy and bumpy but you'll struggle to see individual waves. Because this sort of swell is unable to travel far from the storms that create it you can guarantee that there will be strong local winds when you see these kind of waves forecast.

5 - 6 SECONDS

Much of what's written about 1 - 4 seconds still holds for swells in this range. But you will start to see the odd weak ridable wave face if you're very desperate. Again it'll be almost impossible to find this sort of swell without the strong onshore winds that create it so expect really sub par conditions for surfing.

7 - 9 SECONDS

This would be typical wind swell considered surfable by many surfers, especially those in areas that don't get great waves. Typically this sort of swell will still be in the path of the strong winds that created it, but it will hang around for a short time if the wind direction changes so offshore conditions are possible. The waves will generally be weaker and jumbled up without clear sets. However a good sand bank or bit of reef can generate decent waves and large storm swells at the upper end of this range can produce decent waves at the right spot with the right local winds. The surf produced by these swells will normally be slightly smaller in height than the swell that creates it, losing power as it enters shallow water, but a good reef can create a wave face larger than the swell size at the upper end of this period range.

10 - 12 SECONDS

Swells in this range will often be starting to head away from the storms that create them. It's possible for them to travel in open ocean for some distance. They can often create good quality surf. These swells won't bend or 'refract' into hard to reach surf spots and are less likely to barrel when smaller than longer period swells. On average sandy beaches these mid period swells can create some of the best conditions, a reef or point break needing the swell to refract can prefer a longer period of swell. The waves produced by these swells will often be about the height of the swell itself given the right direction on the average beach. If other conditions are favourable swell in this period range will definitely be worth checking out.

13 - 15 SECONDS

These swells are definitely 'groundswell' - normally created some considerable distance from the beach by powerful storms. They most often arrive without the storm that created them, making for a good possibility of calm local conditions. They're powerful, they will bend or refract around headlands or into more sheltered coves and create, especially when smaller, hollow barrelling waves on even average sand bottomed beaches. These swells will have more defined sets and look a lot more 'lined up' than lower period swells. Typically this sort of swell is great for creating surf and the waves created will often be bigger than the swell height as the swell refracts to focus it's energy in shallow water and the wave shape changes. This sort of swell period would be typical of the peak of an Indonesian swell for example and can create absolutely perfect conditions if other factors are aligned.

16+ SECONDS

Extremely powerful swells generated by distant storms and often travelling the breadth of the largest oceans to reach the beach. These swells can refract considerably as they approach shallower water, bending into sheltered coves, around significant headlands and focusing their energy on beach to create, with the right local conditions, ridable waves considerably larger than the swell height at the right spots. A good example of scenarios in the upper end of this range would be powerful southern Hemisphere swells travelling all the way to California with maximum periods in the 21 seconds range. At just a couple of feet this sort of swell can create 6 - 9ft waves on the beach.

HOWEVER...

There's always a catch. In this case it's that the 'swell period' is a way of describing the most powerful waves in a swell, but a swell will have a mix of waves of different periods and you can't tell much about that mix from just the one number. You could be looking at a thumping pure 16 second period swell that'll have perfect sets of lined up waves, or a mixed up powerful sea with 16 second swell at the top end but wind junk in lower periods creating bumpy confused conditions. Swell period is still one of the most useful bits of information in your tool kit, but be aware of this shortcoming.

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 Posted: Tue May 10th, 2022 06:49 pm
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Bloks
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Dankie DJP


Jy is n yster.

Ek gaan hopenlik Maandag hengel. Sal eers die wifey biekie moet bederf oor die naweek.

Ek soek n vis op die nuwe setup man. My gat jik

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 Posted: Wed May 11th, 2022 06:21 am
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Marthin
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Groter swell periods kan jou ook lelik uitvang by van die diepwater plekke, jy kan vir langer tye rustiger branders kry en dan 'n set van 3 wat jou groot probleme gee, want al die eerste een se water is daar vir die 2de en 3de een om op te tel. Soos DJP se, springgety kan dit net nog meer maak.

Ek en die hele familie is op spring laag by Kleinmond by die bruggie so gevang. Ons het in enkel diep water klipvissies gevang... Laagwater. Die volgende oomblik 3 branders wat tot bo tussen die bosse gehardloop het. Hoe swell, Lang periode en springgety = braai by die huis

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 Posted: Wed May 11th, 2022 07:19 am
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Dr halibut hoffman
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My Gallery: 
Think of a wave like a spring, the wave height at sea has less effect on wave size at shore than the wave period has, the wider the space between and the stiffer the coils of a spring are, the more power or spring the spring has, rather than how wide the helix of the coils are...As the wave gets compressed on the shore and held up from friction with the bottom topography, the period affects more how the spring shaped wave form compresses and stands up, than the amplitude of the wave.

A 2ft swell at 16 seconds will make a bigger wave on the shore than a 8ft wave at 4 seconds. Bigger the period, as djp said, the more surge there is between waves, and sets.

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 Posted: Wed May 11th, 2022 08:36 am
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Bloks
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Great info gentlemen. Thank you to all, i really learnt something new. Appreciate all of yours'input.

Sealine has gone quiet over the years but still the best thanx to people like you guys.

Salute to you

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 Posted: Thu May 12th, 2022 08:00 am
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DJP
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Like anything fishing related their are always the exception to the rule.
Large winter storm swell in the Cape normally coincides with long period ground swell. If the swell goes above 3m the period is normally around 12 to 15 seconds, above 4m its seldom below 13 seconds, probably more around 14 to 16 seconds.
Pre-frontal swell can hit anything from 4-8 hours before the actually storm arrives, this is often the "cleaner" more organised swell which gives rolling water but the Barometer can drop quite quickly which not all fish appreciate. Once the storm hits the swell period often drops a bit and the ocean just gets angry and messy.

So what does this mean for your Gallies and Steenies? The biggest galjoen tend to come out during and just after the storms have hit. However, at these times not all the spots are fishable. There is one trend I've picked up that holds true throughout the Western / Southern Cape. When the swell is big, +4m areas where the swell wrap around points produce big fish and areas where sandy beaches and rocky areas meet up produce fish. Places that are a waste of time are open (facing towards the SW and S which is the predominant swell direction) beaches where the current will just drag you all over and shallow reefs e.g. Strand / Macs etc. and spots that pick up a lot of drift kelp/seaweed.

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 Posted: Thu May 12th, 2022 12:26 pm
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Bloks
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Mana to you sir


Great post. Ek kan aan n paar spots dink wat mooi sal werk gedurede/na storms. Nou moet hulle net kom en ek hoop ekke af is daai tyd

Last edited on Thu May 12th, 2022 12:26 pm by Bloks

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 Posted: Thu May 12th, 2022 01:24 pm
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Blikkiesvis
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Wow guys! This really interesting and thanks for great info!

So if I understand correct, Saturday will not be a great day to fish Struisbaai plaat… 4,4m swell with 15sec intervals!

Attachment: A4A3C929-0A0F-43A8-BF8D-DF194F3FB257.jpeg (Downloaded 95 times)

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 Posted: Thu May 12th, 2022 01:24 pm
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Blikkiesvis
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Sorry, double post

Last edited on Thu May 12th, 2022 01:25 pm by Blikkiesvis

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 Posted: Thu May 12th, 2022 05:24 pm
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Tappit
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to complicated for me to understand, I did matric in the Donkey Class. That all looks like a surfers sea understanding? might be wrong.

I thought the baromter is the key to fishing, but then, if I can go every day, I don't have to worry, some day's I will blank, some day's I will get 7 Cob .... at Davidskraal for example :ifishin :f1shy

Last edited on Thu May 12th, 2022 05:25 pm by Tappit

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 Posted: Fri May 13th, 2022 05:17 am
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DJP
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It’s one of those use it don’t use it pieces of info. E.g. Davidskraal doesn’t like too big swell mostly due to the surge and also amount of kelp that drags through there. Some great spots for big fish east and west of Davidskraal.

We all know fish don’t read books or look at weather predictions, I’ve caught steenies on Glentana beach in massive seas where you nearly need to jog te keep up with sinker, I’ve caught gallies in dam flat water in false bay…. But these area definitely the exception to the rule and for the most part knowing what the sea will look like will help you plan your trip and better your chances of not blanking.

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 Posted: Fri May 13th, 2022 05:18 am
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Bloks
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Yes Tappit


Ek kry so min kans om te hengel. Al is die weer of water toestande nie reg nie gaan ekke anyway. Maar ekke sal graag wil leer oor waar ekke moet gooi en vir wat in verskillende toestande. Dis maar eintlik hoekom ekke meer oor hierdie dinge leer.

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 Posted: Fri May 13th, 2022 09:09 am
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Tappit
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@ DJP, was 2 dae terug op Hermanus plaat gewees, daar het 'n steenbras uitgekom (en dit was lang been water),

Jy hardloop 30 meter in as die water terug trek, gooi, en hardloop 40 meter terug voor die stoot jou vang ( lyk nogals indrukwekkend as jy gooi en jy sien hier kom 'n 2 meter swell op jou af terwyl jy daar diep op 'n lee kol staan) dan moet jy sleep want daardie water kom van agter en vang jou so knie hoogte met die uitgaan slag.

Volgende week lyk mooi water en ek hoor Bloks is juis besig om met die "baas" te onderhandel dat sy hom afgee.

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 Posted: Fri May 13th, 2022 10:33 am
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DJP
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Haha, Tappit ek sê jou dis mos maar hoe visvang werk, as die vis daar is en vreet maak kondisies weinig saak. Ek het baie meer vis gevang toe ek verder van die see af gebly het... as mens te naby bly is daar altyd 'n "te" te koud, te sterk, te plat, te skoon, te hoog, te laag.
Met al die Wes en groot see gaan daar beslis paar visse uitkom!

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 Posted: Fri May 13th, 2022 11:04 am
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Tappit
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@ DJP.. ek sien die water is alweer kwaad hier in Kleinmond se hawe, die skuim le geel, en ek wonder of daar nie dalk iets by Palmiet se strand gaan rond swem.

Het nog nooit die Kleinmond plaat afgestap, ken nie daai area, dalk hoef 'n ou nie eers hermanus plaat toe te ry, want al die vis is hier op jou stoep.

Last edited on Fri May 13th, 2022 11:06 am by Tappit

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 Posted: Fri May 13th, 2022 11:13 am
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DJP
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Daar is beslis mooi Steenbras op daai plaat maar mens moet of iemand ken by Meerensee, of Rooisand oor stap (mens se voertuig nie veilig daar nie), of stap of trap van Kleinmond se kant af...

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 Posted: Fri May 13th, 2022 12:16 pm
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Tappit
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DJP wrote:
Daar is beslis mooi Steenbras op daai plaat maar mens moet of iemand ken by Meerensee, of Rooisand oor stap (mens se voertuig nie veilig daar nie), of stap of trap van Kleinmond se kant af...

Ja, dis privaat gronde daai, so jy moet maar 'n toon klapbeach langs van Kleinmond se kant af.
Of dalk moet 'n ou een van daai mtb's kry waar hulle mos daai klein petrol enjintjie's op die frame vas sit. Jy mag mos fietsry op ons strande.

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 Posted: Fri May 13th, 2022 01:16 pm
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Bloks
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Ek gaan een van die dae vanaf Kleinmond stap op daai plaat.

Ek soek net daai wurm aas om saam te vat.

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