current meters tide gauges figure 1. current speeds incoming tide spring tide july 06 60 cm/s 85...
TRANSCRIPT
Current metersTide gauges
Figure 1 Figure 1
Current speeds incoming tide
spring tideJuly 06
60 cm/s
85 cm/s
20 cm/s
Figure 2 Figure 2
Current speeds outgoing tide
spring tideJuly 06
40 cm/s
60 cm/s
15 cm/s
Figure 3 Figure 3
Current speeds neap tides
July 06
25 cm/s
35 cm/s
8 cm/s
Figure 4 Figure 4
Peak current speeds during river flood
3 Aug 06Always outgoing
105 cm/s75 cm/s
Figure 5 Figure 5
Average current speeds during river flood
3 Aug 06Always outgoing
75 cm/s50 cm/s
Figure 6 Figure 6
Figure 7Figure 7
1942
Figure 8Figure 8
1961
Figure 9 Figure 9
1975
Figure 10 Figure 10
1978
Figure 11 Figure 11
1985
Figure 12 Figure 12
1987
22 July 1994
Figure 13 Figure 13
10 December 1996after Nov 1996 floods
Figure 14 Figure 14
10 October 1997
Figure 15 Figure 15
Jan 1999
Figure 16 Figure 16
5 September 2000
Figure 17 Figure 17
28 March 2001Figure 18 Figure 18
10 October 2002
Figure 19 Figure 19
2003
Figure 20 Figure 20
27 June 2003
Figure 21 Figure 21
6 March 2006
Figure 22 Figure 22
26 July 2006
Figure 23 Figure 23
6 October 2006
Figure 24 Figure 24
estuary flow
marina through flow
marina local flow
Flood tideSki Canal closedSea Glades closed
This was the situation from ~ 1985 to mid-2002 before Sea Glades Bridge was constructed
Figure 25 Figure 25
Flood tideSki Canal openSea Glades closed
estuary flow
marina through flow
marina local flow
This was the situation from mid-2002 (when Ski Canal opened due to a large southward migration of the estuary inlet) till 27 October 2003 when Sea Glades Bridge was opened
Figure 26 Figure 26
Flood tideSki canal openSea glades open
estuary flow
marina through flow
marina local flow
This was the situation from 27 October 2003 (when Sea Glades Bridge was opened) to the present
Figure 27 Figure 27
estuary flow
marina through flow
marina local flow
Flood tideSki Canal closedSea Glades open
This would be the situation if Ski Canal closes again
Figure 28 Figure 28
Sand banks in the marina
as at 10 June 2006
Upstream of Sea Glades Bridge
Figure 29 Figure 29
10 June 2006
Downstream of Sea Glades Bridge
Figure 30 Figure 30
10 June 2006
Upstream of Shore Rd Bridge
Figure 31 Figure 31
10 June 2006
Around Bird Island
Figure 32 Figure 32
10 June 2006
Ski Canal and downstream of
Bird Island
Figure 33 Figure 33
10 June 2006
Cove Canal
Figure 34Figure 34
10 June 2006
Cove Canal
Figure 35 Figure 35
10 June 2006
Cove Canal
Figure 36 Figure 36
Effect of tsunami at Port Elizabeth harbour
Figure 37 Figure 37
Bird Island 27 June 2003
before Tsunami
Figure 38 Figure 38
Bird Island 6 March 2006 after Tsunami
Figure 39 Figure 39
Sea Glades Bridge 27 June 2003
before Tsunami; Sea Glades Bridge
was opened 27 October 2003
Figure 40 Figure 40
Sea Glades Bridge6 March 2006 after Tsunami;
Sea Glades Bridgewas opened
27 October 2003
Figure 41 Figure 41
Tsunami on Sri Lanka coast
strong backwash carries sediment
seaward
Figure 42 Figure 42
Tsunami on Sri Lanka coast
strong backwash carries sediment
seaward
Figure 43 Figure 43
Maintenance dredging of canal to reduce current speed
Trim co
rner eve
n more
to reduce
turbulence
. Erf 1
467 Maintenance dredging of canal to reduce current speed
Armour banks where water currents are causing erosion
6 March 2006
Widen canal: trim Erf 1473
Maintenance dredging of canal to reduce current speed
Trim corner to reduce turbulence
Erf 1470
Figure 44 Figure 44
Erf 2845
Erf 1468
Erf 1363
Erf 1362
Erf 1474