meander bend force in estuary
meander bend force in estuary
(OP)
I'm looking for confirmation of meander bend force. This early map may show an island in a bay.
https://www.google.com/imgres?imgurl=https%3A%2F%2...
It may be this bay where the small red island has now eroded and the brown rectangle could be Yacaaba Head on the northern sandspit.
https://www.anchoragemarina.com.au/wp-content/uplo...
Today there is a 30 metre deep meander along a rocky shore on the southern side of the bay and a 39metre deep channel in the centre of the bay at Soldiers Point and both are down to bedrock. The width of the Heads is 1.3km , depth 10 metres and max flow is 2.8knots , which is similar to Mississippi river 2.7 knots with 7 knots max on outer meander bend, and Mississippi has meander bend migration ranging from <1.0 m/yr to >123.0 m/yr. There is 8hours/day of >.6 knot ebb tide in this bay which is sufficient to transport sand. Max gradient is 25mm /1km length of bay where Mississippi gradient is about 10mm/km. The bay sandspit is clean windblown sand, up to the northern end where the early base ridge terminates as a spur from the north .
In effect , there would have been a Mississippi-scale meander force around the north of the small red island, as indicated by its pointed shape towards Nelson Head on the southern bay and probably there was limited flow then along the southern bay. The north channel width could be .6km and curve radius on 1.2km wide sandspit at .3km, or cr/w ratio of .5 which should be 2-3. A 30m. depth of northern channel is indicated by today's southern channel of such depth. Would this force erode the sandspit down to at least sea-level? The force would decay as water flowed over the eroded sandspit out to sea. Then the first map may be accurate.
https://www.google.com/imgres?imgurl=https%3A%2F%2...
It may be this bay where the small red island has now eroded and the brown rectangle could be Yacaaba Head on the northern sandspit.
https://www.anchoragemarina.com.au/wp-content/uplo...
Today there is a 30 metre deep meander along a rocky shore on the southern side of the bay and a 39metre deep channel in the centre of the bay at Soldiers Point and both are down to bedrock. The width of the Heads is 1.3km , depth 10 metres and max flow is 2.8knots , which is similar to Mississippi river 2.7 knots with 7 knots max on outer meander bend, and Mississippi has meander bend migration ranging from <1.0 m/yr to >123.0 m/yr. There is 8hours/day of >.6 knot ebb tide in this bay which is sufficient to transport sand. Max gradient is 25mm /1km length of bay where Mississippi gradient is about 10mm/km. The bay sandspit is clean windblown sand, up to the northern end where the early base ridge terminates as a spur from the north .
In effect , there would have been a Mississippi-scale meander force around the north of the small red island, as indicated by its pointed shape towards Nelson Head on the southern bay and probably there was limited flow then along the southern bay. The north channel width could be .6km and curve radius on 1.2km wide sandspit at .3km, or cr/w ratio of .5 which should be 2-3. A 30m. depth of northern channel is indicated by today's southern channel of such depth. Would this force erode the sandspit down to at least sea-level? The force would decay as water flowed over the eroded sandspit out to sea. Then the first map may be accurate.
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