YZ-TIDE BA, Secondary Port.ppt
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Transcript of YZ-TIDE BA, Secondary Port.ppt
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5/21/2018 YZ-TIDE BA, Secondary Port.ppt
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BA, Secondary Port
Capt. Yusuf ZORBA
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BA, Secondary Port You learned that how can you calculate tide times and heights for a
specific port.
Also, you learned that how can you calculate tide times and heights
for secondary ports by US Tide Tables.
Our aime for this pratice;
Using Tide Tables for Secondary Port in British Admiralty
Finding HW and LW times for Secondary Port
Finding HW and LW heights for Secondary Port
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BA, Secondary Port
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BA, Secondary Port
The method of finding the time and heights of HW and LW at any
Secondary Port given in the Admiralty Tide Tables is by means of
simple differences in times and heights from predictions for the
Standart Port indicated, which is the most suitable, Standart Port.
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BA, Secondary Port Example 1: Find the times and heights of HW and LW at
Richborough for the PM rising tide on March, 02, 2001.
1. Find the secondary port in the Geographical Index at the back of
ATT (Adm. Tide Table). Note its number.
Richborough : 99
2. Find the Standart Port names and numbers in ATT, Part I
Dover : 89
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BA, Secondary Port3. Find the HW and LW times and heights at the Standart Port for
the required day. Enter in tables (called NP 204), boxes 1 to 4 andcalculate the range for box 5.
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BA, Secondary Port3. Find the HW and LW times and heights at the Standart Port for
the required day. Enter in tables (called NP 204), boxes 1 to 4 andcalculate the range for box 5.
Standart Port HW LW HW LW RANGE
Seasonal
ChangeStd. Port
Differences
Seasonal
ChangeSec. Port
Secondary Port
Duration
1511
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1013 6.0 1.5 4.5
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BA, Secondary Port4. Seasonal Change in Mean Level table from Part II , using its
number and month find the Standart PortsSeasonal Change.Seasonal Changes In Mean Level for number 89 and 99 is same;
-0,1 We change its signed, because of Standart Port heights include
the Seasonal
Change.
Standart Port HW LW HW LW RANGE
1 2 3 4 5
Seasonal
ChangeStd. Port
6 6
Differences7 8 9 10
Seasonal
ChangeSec. Port
11 11
Secondary Port12 13 14 15
Duration 16
1511 1013 6.0 1.5 4.5
0.1 0.1
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BA, Secondary Port5. Note the time and height differences for the secondary port and the
related reference times and reference heights at the Standart Port.
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BA, Secondary Port6. Interpolate between Secondary Port time differences and height
differences.
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BA, Secondary Port6. Interpolate between Secondary Port time differences and height
differences.
Interpolation methods:
1. Using graph paper
2. Using mathematical methods
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6.1. Using graph paper for interpolation;
1800
1200
+10+20+30+40+50+60+70
1511
+15
1300
0700
+30
1013
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6.1. Using graph paper for interpolation;
1800
1200
+10+20+30+40+50+60+70
1511
+15
1300
0700
+30
1013
0.0 m
2.0 m
4.0 m
6.0 m
- 4 - 3 - 2 - 1 0.0 + 1
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Standart Port HW LW HW LW RANGE
1 2 3 4 5
Seasonal
ChangeStd. Port
6 6
Differences
7 8 9 10
Seasonal
ChangeSec. Port
11 11
Secondary Port12 13 14 15
Duration 16
1511 1013 6.0 1.5 4.5
0.1 0.1
6.1. Using graph paper for interpolation;
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6.1. Using graph paper for interpolation;
1800
1200
+10+20+30+40+50+60+70
1511
+15
1300
0700
+30
1013
0.0 m
2.0 m
4.0 m
6.0 m
- 4 - 3 - 2 - 1 0.0 + 1-3.1 -1.3
For 6.1
For 1.6
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BA, Secondary Port
Standart Port HW LW HW LW RANGE
1 2 3 4 5
Seasonal
ChangeStd. Port
6 6
Differences
7 8 9 10
Seasonal
ChangeSec. Port
11 11
Secondary Port12 13 14 15
Duration 16
1511 1013 6.0 1.5 4.5
0.1 0.1
00:15 00:30 -3.1 -1.3
And we complete in boxes 7, and 8, 9, 10.
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6.2. Using mathematical methods
We will make a interpolation for secondary port differences.
For times;
12:00 to 18:00 if +00:15 to +00:15
And our HW time is 15:11 we can say that is same (+00:15)
07:00 to 13:00 if +00:30 to +00:30
And our LW time is 10:13 we can say that is same (+00:30)And we enter this results into boxes #7 and #8.
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6.2. Using mathematical methods
We will make a interpolation for secondary port differences.
For heights;
For HW 5.3 to 6.8 if 2.6 to 3.4
and our height is 6.1 = (0.8 x 0.8)/1.5 = 0.46
so, our differences for HW (-2.6)+(-0.46)= ~ -3.1
For LW 0.8 to 2.1 if 0.7 to 1.7And our height is 1.6 = (0.8 x 1.0)/1.3 = 0.62
And our differences for HW (-0.7)+(-0.62)= ~ -1.3
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And we complete in boxes 7, and 8, 9, 10.
7. Using Secondary Port number to locate the right line, find and enterthe Secondary PortsSeasonal Change for the month in boxes 11.
Richborough : 99
8. Apply
differences to
Standart Port
times and heights
to find times at
the Secondary
Port
(boxes 12-15)
BA, Secondary Port
Standart Port HW LW HW LW RANGE
1 2 3 4 5
Seasonal
ChangeStd. Port
6 6
Differences
7 8 9 10
Seasonal
ChangeSec. Port
11 11
Secondary Port12 13 14 15
Duration 16
1511 1013 6.0 1.5 4.5
0.1 0.1
00:15 00:30 - 3.1 - 1.3
- 0.1 - 0.1
15:26 10:43 2.9 0.2
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BA, Secondary Port Example 1: Find the times and heights of HW and LW at
Richborough for the PM rising tide on March, 02, 2001.
Richborough March, 02, 2001
Time Height
10:43 0.2
15:26 2.9