489 (4)

Załącznik 10 489

10.2. Przykład II

ExampU 1: To find the limes and heightsof high and Iow watcrsat "Secondary Port" (semi-diurnaltides)on I6th January, using thc following extracts.

Extract from ATT Part II

PLACE    posrnos    TIME    HEIGHT DIFFFJtENCES ON METRES ł

DIFttJtENCES

STANDARD PORT    Lu L.«i{    MIIWS MHWN MLWN Ml A s

STANDARD PORT				kc titraci		MHW	MLW	2 5	IS	12	04
SECONDARY PORT				S.	E.
Sccond*rv Por				0*20*	4rjv	-0015	-0025	-12	-Ol	-04	♦Ol
			SŁASONAL CHANGES IN			MEAN LEYEL
No	Jan 1	Kb 1	Mm 1	Ap> 1	May |	Juor |	July 1	Aug 1	S.p 1	Ort. 1	Nov |
STANDARD PORT	-Ol	00	00	♦Ol	•0 2	♦02	♦0.1	00	-0 1	•Ol	-01
Sccoodary port	00	♦0.2	♦01	♦02	♦02	♦0.1	00	-0.1	-OT	•Ot	-Ol

Notrs: (i) The data uscd in this caamplc do not rcfer to the year of these tablcs.

(ii) Cumputation of HW hcight diffcrcnccs is donc by intcrpolation or cxlrapolation, using thc two values tabulaled for HW and the hcight of HW at the Standard Port. Similarly. LW height diffcrcnccs are computed from the data gi ven for LW. In tnost cases. this can be carried out by eye. Howcvcr. the use of a pocket cakulator may be preferrcd. Altcmatively. it may be carried out graphically. as shown be Iow Plot A (MHWS 2.5. differencc -1.2) and B (MHWN I 8. difference -0.8).

Draw a ltnc through A and B. Read off thc hcight diffcrcnccs for Secondary Port correspondtng to the corrected hcights at Standard Port of 1.8 and 2.2 - i.e. -0.8 and -1.0.

Similarly. plot the LW height diffcrences to get Secondary Port differences corresponding to the cotTected heights at Standard Port of 0.9 and 1.3 - i.e. -0.2 and -0.5.

F.ilract front Part I

STANDARD PORT

JANUARY

TiME UJ' m

0324    0.8

1014    1.7

F 1514    1.2

2127    2.1

STANDARD PORT Standard    TtME/HEIGtfT requiredH A LW

secondary por i Sacondary datę HJanriME zoNt-0700

	TIME		HEIGHT
STANDARD POR!	MW	LW	L HW	IW .	RANGĘ
	i tota .2127.	2 0324 1514	J 1 7 2.1	• 0 0 1 2
Sfłsonil changę	Suifclatd Port		6 ^o 1	6 *0.1
DIFFERENCES	’"-0015	'*-0025	•*•-0.8 -1.0	io*-0.2 -0 5
Seasonal changę	Secondary Port		n 0.0	II 0.0
SECONDARY PORT	12 0959 2112	1) 0259 1449	14 1.0 12	IS 07 0.8
DwMion	16

XII