admiralty tide table gel git olayı

1. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
TIDE CALCULATION
ADMIRALTY TIDE TABLES

2. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel

3. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
Admiralty Tide Table (ATT) are published in four volumes;
1. United Kingdom and Ireland (Including English Channel
Ports).
2. Europe (Excluding United Kingdom and Ireland),
Mediterranean Sea and Atlantic Ocean.
3. Indian Ocean and South China Sea (Including Tidal Stream
Tables).
4. Pacific Ocean (Including Tidal Stream Tables).

4. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel

5. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
CHART DATUM
PREDICTED LW
WATER LEVEL
PREDICTED HW
CHARTED DEPTH
SOUNDING
( DOW)
HEIGHT OF TIDE
( H.O.T )
RISE OF TIDE
( ∆H )
RANGE
LW HEIGHT
HW HEIGHT

6. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
Charted Depth: The depth on a chart is measured from a level
known as Chart Datum (CD). On a modern chart, Chart Datum
is normally placed at the level of the Lowest Astronomical
Tide (LAT) which is the lowest level which can be predicted to
occur under average meteorological conditions and under any
combination of astronomical conditions.
LW and HW Heights: LW and HW heights are always
measured from Chart Datum.
Rise of Tide (∆H): Rise of Tide is the vertical distance
measured from LW to the actual water level.
Height of Tide (H.O.T): Height of Tide is the vertical distance
measured from Chart Datum to the actual water level.

7. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
Find the actual sea level, if the
C.D is 14,3 m. at 06:20 (GMT)
on 1st February 2000.
1. Duration: HWT – LWT
10:44 – 03:19 = 7h:25m (Falling)
2. Range: H of HW – H of LW
6,1 – 1,7 = 4,4 m.
3. Δt: HWT – DT or DT – HWT
06:20 – 03:19 = 03h:01m

8. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
C.D
14,3
SEA BOTTOM
LW 10:44
H of LW: 1,7
HW 03:19
Range:4,4 06:20W L
HOT
ΔH
H of HW: 6,1
DOW = 14,3 + HOT ( ΔH + H of LW )

9. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
There are two different ways to find the ΔH.

10. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
First way is to find ΔH = Range x Factor
Actual range = 4,4
Δt = 3h:01m After HW
Sp 6,0 0,63
Np 3,2 0,59
2,8 0,04
1,2 F
F = 0,02
Factor = 0,59 + 0,02
= 0,61
Δh= 4,4 x 0,61 = 2,7 m.
DOW = 14,3 + 2,7 + 1,7 = 18,7 m.

11. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
Second way is to find ΔH with Curves
Δt = 3h:01m After HW
HW = 6,1 m.
LW = 1,7 m.
HOT = 4,4 m.
DOW = 14,3 + 4,4 = 18,7 m.
Actual range = 4,4

12. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
1st February 2000; The sounding
taken 17,4 m. by echo-sounder
at the noon. If the C.D is 12,7 m.
Find the exact time.
1. Duration: HWT – LWT
15:43 – 10:44 =4h:59m (Raising)
2. Range: H of HW – H of LW
5,7 – 1,7 = 4,0 m.
3. Δt: HWT – DT or DT – HWT
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13. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
C.D
12,7
SEA BOTTOM
H of LW: 1,7
HW 15:43
Range:4
At noonW L
HOT
ΔH
H of HW: 5,7
17,4 = 12,7 + ΔH + 1,7 ; ΔH = 3 m.
LW 10:44
(DOW)
Sounding 17,4

14. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
There are two different ways to find the Δt.

15. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
First way ΔH = Range x Factor
Actual range = 4
3 = 4 x F
F = 0,75
Sp 6,0 1h:42m
Np 3,2 2h:02m
2,8 20m
0,8 f
f = 06m
2h:02m – 06m = 1h:56m
1h:56m Before HW
15h:43m
1h:56m
13h:47m

16. DOKUZ EYLUL UNIVERSITY
SCHOOL OF MARITIME BUSINESS AND MANAGEMENT
DEPARTMENT OF DECK
E.Gürel
Second way is to find Δt with Curves
Actual range = 4
HOT = 4,7
HW = 5,7 m
LW = 1,7 m
HOT = 4,7m
Δt= 1h:56m
1h:56m Before HW
15h:43m
1h:56m
13h:47m