yz-tide ba, secondary port.ppt

5/21/2018 YZ-TIDE BA, Secondary Port.ppt

1/20

1

BA, Secondary Port

Capt. Yusuf ZORBA


2/20

2

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


3/20

3

BA, Secondary Port


4/20

4

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.


5/20

5

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


6/20

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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.


7/207

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

- -

1013 6.0 1.5 4.5


8/208

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.


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


9/209

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.


10/2010

BA, Secondary Port6. Interpolate between Secondary Port time differences and height

differences.


11/2011

BA, Secondary Port6. Interpolate between Secondary Port time differences and height

differences.

Interpolation methods:

1. Using graph paper

2. Using mathematical methods


12/2012

6.1. Using graph paper for interpolation;

1800

1200

+10+20+30+40+50+60+70

1511

+15

1300

0700

+30

1013


13/2013


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


14/2014


1 2 3 4 5

Seasonal

ChangeStd. Port

6 6

Differences

7 8 9 10

Seasonal

ChangeSec. Port

11 11


Duration 16

1511 1013 6.0 1.5 4.5

0.1 0.1



15/2015


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


16/2016

BA, Secondary Port


1 2 3 4 5

Seasonal

ChangeStd. Port

6 6

Differences

7 8 9 10

Seasonal

ChangeSec. Port

11 11


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.


17/2017

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.


18/2018

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


19/2019

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


1 2 3 4 5

Seasonal

ChangeStd. Port

6 6

Differences

7 8 9 10

Seasonal

ChangeSec. Port

11 11


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

- - - - -


20/2020

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

yz-tide ba, secondary port.ppt

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