survey team briefing

1. 1
In the name of ALLAH the most
Beneficent and the Merciful

2. HYDROGRAPHIC SURVEY
BSMRMU-2022
KARNAPHULI RIVER &
OUTER ANCHORAGE AREA
BN HYDROGRAPHIC
&
OCEANOGRAPHIC CENTRE

3. 3
OCCASSION
PRE SURVEY BREEFING

4. 4
SURVEY OVERVIEW
Survey Officer In Charge (SOIC) : Officer-In-Charge

5. 5
• Survey Team is going through the practical phase
• Survey Team will undertake Ashore and Afloat
Hydrographic Survey Operations at Karnaphuli Channel by
Single Beam Echo Sounder (SBES) & Harbour Mouth Of
Chattogram Harbour by Multibeam Echo Sounder (MBES).
INTRODUCTION

6. 6
AIM
To brief about the Preparation, Planning, Interfacing
of the Equipments, execution and Data rendering
method of the Hydrographic Survey.

7. 7
SCOPE
• Survey Specifications
• Survey Planning
• Data Security
• Interface
• Recommendations

8. 8
SURVEY SPECIFICATIONS
Projection
• UTM Bangla
Elipsoid
• WGS-84
Scale of Survey
• 1:10 000
Order of Survey
•Block A1 – IHO Order 1a
•Block A2 – IHO Order 1b
Existing Chart
• BN Chart 1501 & 3001

9. 9
ORDER OF SURVEY

10. 10
REFERENCES
 S-44 (IHO Standards for Hydrographic Survey) 6th
Edition
 HM Operational Guidance (HMOG) Version 01-18
 General Instructions for Hydrographic Surveyor’s (NP-135)
 Manual of Hydrography (C-13)
 Admiralty Manual of Hydrographic Surveying Vol – I (NP 134a)
 Admiralty Manual of Hydrographic Surveying Vol – II (NP 134b)
 BN Chart 1501 (Patenga Point to Shah Amanat Bridge)
 BN Chart 3001 (Chattogram Harbour)

11. 11
LIST OF EQUIPMENT
• As per HI to conduct the survey several equipment will be
needed
• All the equipment will be collected from BNHOC and Survey
Ships
SER INSTRUMENT NAME QTY
1. Hull mounted (Retractable) Multibeam Echo Sounder
(Teledyne Reson, Seabat T20-P 200)
01
2. Hull mounted Single beam Echo Sounder
(Teledyne Odom, Echo Track CV3 Mk3)
01
3. Portable Single beam Echo Sounder
(Teledyne Odom, Echo Track CVM)
02
4. Caris HIPS & SIPS License 01

12. 12
LIST OF EQUIPMENT
SER INSTRUMENT NAME QTY
5. Hypack Max License and Hypack 2015/2018/2019/2020 03
6. Electronic Theodolite (ETL) (SOKIA) 01
7. Side Scan Sonar (Edge Tech 4125) 01
8. DGPS Receiver
(Leica Viva GS10)
02
9. Geodetic GPS Receiver
(Hemisphere Model-R321)
01
10. Auto Tide Gauge
(Vale port Tide Master)
01
11. Sound Velocity Profiler
(SVP Swift)
01
12. Grab Sampler (Ponar) 01
13. Bar Check 01

13. 13
LIMITS OF SURVEY
The area will be surveyed in accordance with IHO
publication S-44 (IHO standard for Hydrographic Surveys)
Block A1 (MBES)
Order 1a
Latitude Longitude
22° 08 30 N
ꞌ ꞌꞌ 091° 40 00 E
ꞌ ꞌꞌ
22° 08 30 N
ꞌ ꞌꞌ 091° 42 00 E
ꞌ ꞌꞌ
22° 10 30 N
ꞌ ꞌꞌ 091° 42 00 E
ꞌ ꞌꞌ
22° 10 30 N
ꞌ ꞌꞌ 091° 40 00 E
ꞌ ꞌꞌ
Block A2 (SBES)
Order 1b
Latitude Longitude
22° 15 00 N
ꞌ ꞌꞌ 091° 49 36 E
ꞌ ꞌꞌ
22° 15 00 N
ꞌ ꞌꞌ 091° 50 18 E
ꞌ ꞌꞌ
22° 14 00" N
ꞌ 091° 49 30 E
ꞌ ꞌꞌ
22° 14 00" N
ꞌ 091° 48 28 E
ꞌ ꞌꞌ

14. 14
EXECUTION

15. 15
PREPARATORY PHASE
The preparatory phase may be completed by three
separate compositions.
 Administrative Preparation
 Departmental Preparation
 Departmental Co-Ordination

16. 16
ADMINISTRATION PREPARATION
Selection of one or more hydrographic/oceanographic survey
Ship/Boat.
 All personnel permanently on the strength of the survey unit.
 The survey Unit has available to premises ashore offices,
stores, etc.
 Special equipment supply is to be arranged for position fixing,
geodetic work, oceanography, tidal work, etc.
In addition, special form of assistance, such as diving teams or
aircraft, to be approved in time.

17. 17
ADMINISTRATION PREPARATION
 Stores, consumable or otherwise supplied either by Dte. Hydrography
or by NSD.
 Contingency Fund, in the form of cash.
 Vehicles.
 Co-Ordination with Other Military/Civil Authorities.
 Position Control Station.

18. 18
DEPARTMENTAL PREPARATION
Land map.
 Topographical map.
 Existing nautical chart.
 Last survey Fair sheet.
 Last survey report.
 Last survey tidal information.
 List of wreck & obstruction.
 List of Bench mark.
 Geodetic station with co ordinates.
 Collection of Equipments.

19. 19
DEPARTMENTAL CO-ORDINATION
The coast Lining.
Overall limits of the Survey.
Limits of each area according to scale.
 Depth Contour and shoals in existing chart.
Sounding Line pattern.
Current Meter station.

20. 20
DEPARTMENTAL CO-ORDINATION
Sweeping Line pattern.
Bottom and Water Sampling station.
Topography planning.
Photography planning.
Site for Tidal Station.
 Total required Working Day for survey.
 Purchase of stationeries & others items.

21. 21
COMPOSITION OF TEAMS
SER NAME TASK REMARKS
1. 01 X Officer Overall In-Charge
Data Acquisition Team
2. 01 X CPO/ PO Boat In-Charge
3. 01 X LS In-Charge Data Acquisition Team
4. 03 X AB/ OD Data Acquisition Team
5. 01 X EN/ REN Technical Staff
6. 01 X LS In-Charge of Tide Gauge Reader Tide Gauge
Installation Team
7. 03 X AB Tide Gauge Reader

22. 22
COMPOSITION OF TEAMS
SER NAME TASK REMARKS
8. 01 X PO/ LS In-Charge Levelling Team
Levelling
Team
9. 03 X LS/AB Levelling Team
10. 01 X PO/ LS In-Charge Coastling/
Topography Team Coastline &
Topography
Team
11. 01 X LS/AB/ OD Coastlining/ Topography Team

23. 23
DATA SECURITY
• The data gathered by the hydrographic survey is most valuable
asset for the nation, so its security must be pay on the highest
state. By ensure followings
 Control entry of others in Data Processing Room(DPR).
 Never use internet with data computer.
 Keep back up in a CD ROM and store with lock & key.
 Avoid uses of pen drive in data computer.
 Never give a copy of data to others without approval.

24. 24
HORIZONTAL CONTROL

25. 25
ESTABLISHMENT OF HORIZONTAL CONTROL
• The control point to be established using Trimble
rtx/CSRS-PPP/AUSPOS online GNSS data post
processing application
• Period of observation will be 12 hours
• RTK base stations to be set up at existing BM.

26. 26
ESTABLISHMENT OF HORIZONTAL CONTROL
 We will use a set of LEICA VIVA GS 10/
Trimble SPS461 Geodetic Receiver for
establishing geodetic control, SBES
survey and coast lining

27. 27
ESTABLISHMENT OF HORIZONTAL CONTROL
• The following geodetic parameters are to be
used:
Datum WGS 84
Spheroid WGS 84
Semi Major Axis 6378137.0
Inverse Flattening (1/f) 298.257223563
Projection Transverse Mercator – UTM
Bangla
Zone -
Central Meridian 90 E
⁰

28. 28
VERTICAL CONTROL
VERTICAL
CONTROL

29. 29
VERTICAL CONTROL
• For Tidal Correction of survey area need tide gauge
• Collect Continuous Tidal Data
• Collect Data form Conventional/ Auto Tide Gauge at the
same Time.

30. 30
VERTICAL CONTROL
• I/C to ensure download and compilation of tidal
observation data at end of each day survey work
• I/C to ensure vessel draft readings before and
after each days survey work

31. 31
• Single Beam Echo Sounder Operations (SBES)
• Multi Beam Echo Sounder Operations (MBES)
SOUNDING OPERATIONS

32. 32
SBES
SOUNDING OPERATION

33. 33
SBES AREA
A2
Dimension 1.24 X 0.9 nm
SBES SURVEY
22° 15ꞌ 00ꞌ N
ꞌ
091° 50 18 E
ꞌ ꞌꞌ
22° 14ꞌ 00ꞌ N
ꞌ
091° 48ꞌ28ꞌ E
ꞌ
22° 15ꞌ 00ꞌ N
ꞌ
091° 49ꞌ36ꞌ E
ꞌ
22° 14ꞌ 00ꞌ N
ꞌ
091° 49 30 E
ꞌ ꞌꞌ

34. 34
PLANNED LINE
• 25 m or 3 times the average depth,
whichever is greater
• Planned line spacing =30 m
• Perpendicular to the coast /
contour line
• Direction 090˚/270 ˚
• Total PL 63
• Total distance to run =41 nm
SBES SURVEY

35. 35
CROSS LINE
• To be done at first opportunity
• To get general idea
• To check the accuracy of sounding
operation
• 10 times of planned line Spacing
SBES SURVEY

36. 36
CROSS LINE
• Cross line spacing =300m
• Parallel to the contour line or coast line
• Direction 180˚/000 ˚
• Total CL- 9
• Total distance to run = 4 nm
SBES SURVEY

37. 37
BOAT PLANNING
• Total distance to run (PL + CL +Turning )
=(41+4+5)=50 nm
• Speed 5 knots
• Total time required =10 hrs
• Per day survey time = 08 hrs (0700 to 1500)
• Total 2 days required by one boat
SBES SURVEY

38. 38
Purpose of Calibration
• To find out the instrumental error
• The mean speed of sound in water
Frequency of Calibration
• Before starting and on completion of everyday survey
operation
• Before and after high or low water
• After heavy rain fall
CALIBRATION OF SINGLE BEAM ECHO SOUNDER (SBES)

39. 39
MBES
SOUNDING OPERATION

40. 40
LIMITS OF SURVEY
BLOCK - A1
MBES
22° 15 00 N
ꞌ ꞌꞌ
091° 50 18
ꞌ ꞌꞌ E
22° 14 00 N
ꞌ ꞌꞌ
091° 49 30 E
ꞌ ꞌꞌ
22° 14 00 N
ꞌ ꞌꞌ
091° 48 28 E
ꞌ ꞌꞌ
22° 15 00 N
ꞌ ꞌꞌ
091° 49 36 E
ꞌ ꞌꞌ

41. 41
PLANNING OF SURVEY
• Dimension of Area 1 (2nm X 2nm)
• Order 1a
• 100% Bathymetric coverage

42. 42
PLANNING OF SURVEY
• Plan lines are Parallel to the contour and the
direction is 000°
• Patch test is to be conducted before survey
operation

43. 43
• General depth at survey area 8m
• Seabat T20-P 200 MBES swath angle can be 140°
• Considering the swath angle 140° the coverage
can be up to 40m
• Considering the overlap of 10% the line spacing is
35m
PLANNING OF SURVEY

44. 44
PLANNING OF SURVEY
• Line Spacing : 35m
• Total PL : 99
• Total Run : 196.5 nm
• Ship speed : 8 Knt.
• Total Time : 24.5 hrs

45. 45
PATCH TEST
LATENCY
• Data to be used:
– A well defined feature, or
perpendicular to a slope. Nadir data
only
• Procedure:
– Two runs (lines) - same path - same
direction
– One run with minimum speed
– One run with maximum speed

46. 46
PATCH TEST
PITCH
• Data to be used:
• A well defined feature, or
perpendicular to a slope.
• Procedure:
• Two runs (lines) - same
path - opposite direction
• Both runs with SAME
SPEED over the ground

47. 47
PATCH TEST
ROLL
• Data to be used:
• A flat seabed
• Procedure:
• Two runs (lines) - same
path - opposite
direction
• Both runs with SAME
SPEED over the ground

48. 48
PATCH TEST
YAW
• Data to be used:
• A flat seabed with
distinguished feature
• Procedure:
• Two runs (lines) - different
path - opposite direction
• Both runs with SAME SPEED
over the ground

49. 49
SSS
AREA – A1
FEATURE SEARCH

50. 50
PLANNED LINE
• Planned line spacing =30 m
• In the direction of the tidal stream
• Direction 200˚
• Total distance to run 0.5 X 3=1.5 NM
SSS OPERATION

51. 51
• Coastline will be delineated by walking
• As Per Survey Order Use Positioning System
• THU for coast lining for Order 1a: 10m
COASTLINING

52. 52
COASTLINING

53. 53
COASTLINING AND TOPOGRAPHY
• RTK method will be followed
• Topographic Survey Data will be Recorded in
Leica GS10 & also noted manually and drawn in
the paper
• Conspicuous objects will be surveyed during
coast lining
• Collected data will be compared with satellite
images of survey area

54. 54
LIGHTS AND BUOYS
• There is 07 in no Mooring Bouy.

55. 55
PROPOSALS FOR NEW FEATURE NAMES
• Newly charted features to be proposed
• A name which is fully used locally to be ascertained
• Proposed name should be indicated in the
accompanying sheets

56. 56
SEABED SAMPLING
• Seabed sampling will be collected at 10 cm apart, on
the scale of survey
• Use Suitable Bottom Sampler
• General nomenclature as shown on existing chart is
soft mud

57. 57
SEABED SAMPLING

58. 58
REQUIREMENTS
• 1 Boat and 1 Grab Sampler
• Each sample will take 8 minutes to accomplish
• Total time for the whole sampling is 4 hours
approximately

59. 59
Q & A

60. 60
Thank You