# I Sluice gate and Groyne

#### math04

How can someone relate between both the flow under a sluice gate and flow past a groyne at the seaside with the free surface topic?

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#### davenn

Gold Member
How can someone relate between both the flow under a sluice gate and flow past a groyne at the seaside with the free surface topic?

What research have you do so far to try and come to an answer ?

#### math04

I am with problems of free surfaces.

#### sophiecentaur

Gold Member
I can't help thinking of this thread title as the possible name for a firm of lawyers. (Along with 'Gray and Balding' and 'Sue Grabbit and Run')

#### math04

I can't help thinking of this thread title as the possible name for a firm of lawyers. (Along with 'Gray and Balding' and 'Sue Grabbit and Run')
My question is very simple: what is the relation between both of groyne and sluice gate with the free surface topic.

#### sophiecentaur

Gold Member
My question is very simple: what is the relation between both of groyne and sluice gate with the free surface topic.
As you want us to be sensible, perhaps you could give some context to this and one or two references. I think you may find that groyne specialists are rare on PF.

#### davenn

Gold Member
How can someone relate between both the flow under a sluice gate and flow past a groyne at the seaside with the free surface topic?

since sluice gates ..... not typically used on sea sides and
groynes .... used on seasides ( coastlines)

are two very different things with different uses. Please tell us what you really want to discuss
and why the masses of info available online doesn't help you understand the different uses
and locations that they are used in.

Also, what do YOU mean by "free surface topic" ?

Dave

#### sophiecentaur

Gold Member
since sluice gates ..... not typically used on sea sides and
groynes .... used on seasides ( coastlines)

are two very different things with different uses.
I was trying to visualise a system which would give variable control to the effect of 'longshore drift' on the sand on holiday beaches. I imagine sitting on the beach and watching a version of this hybrid system, wondering how it works.

#### Nik_2213

I remember being very surprised by the quantity of baffles etc inside a 'fuel barge'.
Was merrily drafting a tale, set high on an African river, which had two such barges, previously stranded, salvaged and re-purposed as 'Clubship Landfill', used to evacuate people from a town cut-off by insurgents.
Getting into the detail, what looked a couple of boring TEU shipping containers actually held a remarkably intricate set of partitions, sluice gates and slosh dampers. To suppress / mitigate 'Free Surface' instability with a part-load, of course, of course.
{ Face Palm...}
This changed the paradigm. By the time I'd researched and figured the now-complex access issues, my Muse had moved on...
:-(

The OP has been a bit coy, but I wonder if this query has to do with along-shore beach drift choking river and stream mouths ?? IIRC, several Medieval UK East Coast port-towns lost their fishing and shipping access when sand banks shifted. Some were gradual, due eg cyclic sand-spit in 'growing' phase. Others were storm driven, the town's river briefly dammed, forced to a new course overnight. Either way, 'game over', former prosperity and influence consigned to history...

Groynes are usually seen as 'passive' measures. But, if shutters / sluice gates were added, raised and lowered according to weather and tidal flow, the combination might be able to reduce sediment deposition in an essential channel, then scour it clear. Perhaps with help from fresh-water ponded behind river's sluice gates ?

( Ponding fresh water thus may also mitigate saline incursions, win, win, win... )

I know some ports installed 'block ships' to regulate along-shore drift, and others built estuarine 'training walls', like a submerged break-water, to stabilise the shipping channel...

A 'mini-me' version could prove a life-line to a small, coastal community so reliant on its small river.
YMMV.

"Sluice gate and Groyne"

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