29. ﺧ ﺭ ﺗ ﻧﺑﺫ ﺩﻣ ﻣ ﻝ ﻷ ﺻﻝ
___________________________________________
___________________
______________________________________________________________
ﺋ ﻣ ﺣ ﻣﺳ
/
ﺟﺭ ﺩﺭ
ﺩ
.
ﺩ ﺩ ﷴ ﺟﻣ
ﺟﺩﻭﻝ
)
-
(
ﺍﻟﺭﺃﺳﻳﺔ ﺍﻟﻣﺭﺍﺟﻊ
ﺍﻟﺭﺃﺳ ﺍﻟﻣﺭﺟﻊ
ﺗﻌﺭﻳ
ﺳﻁ ﻣﻧﺳ ﺳﻁ ﻣﺗ
ﺑﺣﺭ
MSL
ﺭﺗ ﺗﺣﺩﺩ ﺗ ﺳ ﻣﻥ ﺭ ﻛﺑ ﻣﺟﻣ ﺑ ﺣﺳ ﺳﻁ ﻣﺗ
ﺭﺑﺣ ﻁﺳ
)
ﺩﺩﻣﺣ ﻁ ﻧ ﺩﻧ
.(
ﺩ ﺩﺗﻣ ﺗ
MSL
ﻝ ﻁ
ﺩ ﺃﺭﺻ ﻥﻣ ﺩ ﺗﺣﺩ ﺗ ﻣ ﺳﻥﺃﺣ ، ﺳ ﺯﻣﻧ ﺭﺗ
ﺭ ﻣﺩ
.
ﺳﻧ
.
M.S.L. is the average level taken up by the
sea. The best result can be obtained with
18.6 years observation
ﺩ ﻣ ﺳ ﻣﻧ ﻁ ﺳ ﻣﺗ
ﺟﺯﺭ
Mean Tide Level:
MTL
ﺭﺑﺣ ﺳﻁ ﺭﺗ ﻝ ﺃ ﺃ ﺳ ﺑ ﺣﺳ ﺳﻁ ﻣﺗ
ﻣﺣﺩﺩ ﺯﻣﻧ ﺗﺭ
.
ﺩ ﻛ
MTL
ﺳ ﺃﻥ
MSL
.
M.T.L. is the average value of all the heights
of high and low waters over a certain period
ء ﻣ ﻷ ﺭﺑ ﺳﻁ ﻣﺗ
Mean High Water
Spring: MHWS
ﺫﻩ ﻝ ﺧ ء ﻣ ﺭﺗ ﻷ ﺑ ﻣﺗ ﺳﻧ ﻝ ﺧ ﺳﻁ ﻣﺗ
ﻣﻛﻥ ﻣ ﺃﻛﺑﺭ ﺟﺯﺭ ﻣﺩ ﻣﺩ ﻥ ﻛ ﻧﺩﻣ ﺗﺭ
.
The average, throughout a year when the
average maximum declination of the moon is
23.5o, of the high two successive high waters
during those period of 24 hours, when the
range of the tide is greatest.
ء ﻣ ﻝ ﻷ ﺭﺑ ﺳﻁ ﻣﺗ
Mean Low Water
Spring: MLWS
ﻝ ﺧ ء ﻣ ﺭﺗ ﻝ ﻷ ﺑ ﻣﺗ ﻧﺳ ﻝ ﺧ ﻁﺳ ﻣﺗ
ﺫﻩ
ﺗﺭ
)
ﻣﻛﻥ ﻣ ﺃﻛﺑﺭ ﺟﺯﺭ ﻣﺩ ﻣﺩ ﻥ ﻛ ﻧﺩﻣ
.(
The average height obtained by the two
successive low waters during the same
period.
ﻷ ﻣﺣ ﻁ ﺳ ﻣﺗ
ء ﻣ
Mean High Water
ﺫﻩ ﻝ ﺧ ء ﻣ ﺭﺗ ﻷ ﺑ ﻣﺗ ﺳﻧ ﻝ ﺧ ﺳﻁ ﻣﺗ
ﺗ
ﻣﻛﻥ ﻣ ﻝ ﺃ ﺟﺯﺭ ﻣﺩ ﻣﺩ ﻥ ﻛ ﻧﺩﻣ ﺭ
.
The average, throughout a year as defined in
30. ﺧ ﺭ ﺗ ﻧﺑﺫ ﺩﻣ ﻣ ﻝ ﻷ ﺻﻝ
___________________________________________
___________________
______________________________________________________________
ﺋ ﻣ ﺣ ﻣﺳ
/
ﺟﺭ ﺩﺭ
ﺩ
.
ﺩ ﺩ ﷴ ﺟﻣ
Neap: MHWN
M.H.W.S., of the height of two successive
high waters during these periods when the
range of the tide is least.
ء ﻣ ﻝ ﻷ ﻣﺣ ﺳﻁ ﻣﺗ
Mean Low Water
Neap: MLWN
ﻣ
ﺫﻩ ﻝ ﺧ ء ﻣ ﺭﺗ ﻝ ﻷ ﺑ ﻣﺗ ﻧﺳ ﻝ ﺧ ﻁﺳ ﺗ
ﺗﺭ
)
ﻣﻛﻥ ﻣ ﻝ ﺃ ﺟﺯﺭ ﻣﺩ ﻣﺩ ﻥ ﻛ ﻧﺩﻣ
.(
The average height obtain from the two
successive low waters during the same
period.
ء ﻣ ﺃ ﺃ ﺳﻁ ﻣﺗ
Mean High High
Water: MHHW
ﻷ ﺑ ﺳﺣ ﺳﻁ ﻣﺗ
ﻣ
ﻥﻣ
ﺭﻷﻛﺑ ﻥ ﻣﺗ
ﻣﺣﺩﺩ ﺯﻣﻧ ﺗﺭ
The mean of the higher of the two daily high
waters experienced over a period.
ء ﻣ ﻝ ﺃ ﻝ ﺃ ﺳﻁ ﻣﺗ
Mean Low Low
Water: MLLW
ﺭﺗ ﻝ ﻷ ﻥ ﻣﺗ ﻣﻥ ﻣ ﻝ ﻷ ﺑ ﺣﺳ ﺳﻁ ﻣﺗ
ﻣﺣﺩﺩ ﺯﻣﻧ
.
The mean of the lower of the two daily low
waters experienced over a period.
ﻛ ﺟﺯﺭ ﻣﺩ ﻝ ﺃ
Lowest
Astronomical Tide:
LAT
ﺑ ﺅ ﺗﻧﺑ ﻥ ﻣﻛ ﺭﺗ ﻝ ﺃ
)
ﺑ ﺳ ﺣ
(
ﺭ ﻅ ﺩ ﻧ ﺩﺙ ﺣ ﺩ
ﻛ ﻅﺭ ﺃ ﻧﺩ ﺳﻁ ﻣﺗ ﺧ ﻣﻧ
.
ﻝ ﺧ ﻣﻥ ﺑ ﺣﺳ ﺗ
ﺯﺭﺟ ﺩﻣ ﺳ ﺩﺭ
ﺭﺗ
)
ﻣﺛ
(
.
ﻧﺳ
.
ﻣﺭﺟ ﺭ
ﻁ ﺧﺭ
chart Datum
ﺩﻣ ﺃ ﺫ ﺭﺗ ﺃﻧ
ﻣﻥ ﻛﺛﺭ ﺑ ﻣﺗﻧﺑ ﺟﺯﺭ
.
ﻣﺗﺭ
.
The lowest level which can be predicted to
occur under average meteorology condition
and under any combination of astronomical
conditions. It can only be obtained properly
by studying tidal prediction covering (ideally)
about 18.6 years, as the level of L.A.T will not
be reached every year. Chart datum has
31. ﺧ ﺭ ﺗ ﻧﺑﺫ ﺩﻣ ﻣ ﻝ ﻷ ﺻﻝ
___________________________________________
___________________
______________________________________________________________
ﺋ ﻣ ﺣ ﻣﺳ
/
ﺟﺭ ﺩﺭ
ﺩ
.
ﺩ ﺩ ﷴ ﺟﻣ
been rather more broadly defined as the level
below which no predicted tide shall fall by
more than 0.1 meter.
ﻛ ﺟﺯﺭ ﻣﺩ ﺃ
Highest
Astronomical Tide:
HAT
ﺃ
ﺑ ﺅ ﺗﻧﺑ ﻥ ﻣﻛ ﺭﺗ
)
ﺑ ﺳ ﺣ
(
ﺭ ﻅ ﺩ ﻧ ﺩﺙ ﺣ ﺩ
ﻛ ﻅﺭ ﺃ ﻧﺩ ﺳﻁ ﻣﺗ ﺧ ﻣﻧ
.
H.A.T. is the highest level which can be
predicted to occur under average
meteorology condition and under any
combination of astronomical conditions.
ﺗ ﺻ ﺟﺱ ﻣﺭﺟ
Sounding Datum
ﺋ ﻣ ﻣﺳ ﻝ ﻣ ﺃ ﻛ ﺗ ﺫ ﻣﻧﺳ ﺃ ﻣﺭﺟ
.
The level to which soundings are reduced in
the course of a hydrographic survey, and is
therefore the datum used for the completed
fair chart or final tracing.
ﻁ ﺧﺭ ﻣ
Charted Depth
ﺗ ﺻ ﺟﺱ ﻣﺭﺟ ﺩ ﺭﺃﺳ ﻣﺳ
.
The vertical distance between object to
sounding datum
ﺷﻛﻝ
)
-
(
ﺔ ﺍﻟﻣﺧﺗ ﺍﻟﺑﺣﺭﻳﺔ ﻭ ﺍﻷﺭﺿﻳﺔ ﺍﻟﺭﺃﺳﻳﺔ ﺍﻟﻣﺭﺍﺟﻊ