Hydrography

53問 • 1年前

Na Me

通報

問題一覧

branch of survey that deals with water bodies

Hydrography

study, description and mapping of ocean, lakes and rivers

Hydrography

process of measuring depth of body of water

Sounding

unit measurement of water

Fathom

1 fathom= ?

6ft

process of making measurements to predict water rate of discharge

Stream Gauging

a map or chart of water

Hydrographic Chart

specific tide levels used as surface of reference for depth measurement

Tidal Datum

volume of water flowing past a section of waterways

Discharge

current or steady flow of water

Stream

process of scooping and sucking up mud

Dredging

imaginary line found on the surface of the Earth underwater

Subaqueous Contour

Steps in Hydrography

Reconnaissance, Establishment of Horizontal Control, Establishment of Vertical Control, Topographic Survey, Hydrography, Preparation of Hydrographic Map

Equipments Used In Hydrographic Surveying

Sextant, Sounding Craft, Sounding Machine, Sounding Pole, Leadline, Fathometer, Signal, Tide Gauge

Rise and Fall of sea level cause by gravitational forces exerted by moon and sun

Tides

Moon and Earth

Lunar Tide

Sun and Earth

Solar Tide

High Tide Above Average, Low Tide Below Average

Spring Tide

Low Tide Above, High Tide Below

Neap Tide

water is falling and moving seaward

Ebb Tide

water surface rising and moving toward shore

Flood Tide

Horizontal Movement of Water

Tidal Current

direction of current flow

Set

speed of current flow

Drift

period which the greatest peak or depression was reached

Stand

Principal Datum Used

Mean Sea Level, Mean Low Water, Mean Lower Low Water, Mean Low Water Spring

two high and two low tides each tidal day

Semidiurnal Tide

one high and one low tide

Diurnal Tide

two high and two low each day

Mixed Tide

Types of Tide Gauges

Registering, Non Registering

Simplest Type of Gauge

Staff Gauge

Consisted of graduated board

Staff Gauge

used when intensity of tide is high and more variation of water level

Float Gauge

consist a weight attached to a brass or wire

Weight Gauge

automatically record the variation of water level within time

Self Registering Gauge

obtained by taking the mean of height of all tides measured at a regular interval of one hour over a stated period

Mean Sea Level

Composition of Sounding Party

Chief of Party, Instrument Man, Recorder, Leads Man, Coxswain, Lookout, Signal Man, Fathometer Attendant

line along which sounding are made

Range Line

required to mark range line

Shore Signal

Range Line = _ Signals

a float made of light wood or hollow air tight vessel

Buoy

Index Glass, Index Arm, Horizon Glass, Pin Hole Plate, Ring Carrying Telescope, Arc, Vernier, Clamp, Tangent Screw, Reading Glass, Handle

a hand driven machine consist of cast iron casing

Weddell's Sounding Machine

measure the depth below the boat on which it is installed

Echo Sounding Machine

Most Common Angle Measureming Instrument

Theodolite, Prismatic Compass, Sextant

used in measuring angle from sounding boat

Sextant

observation are made from the shore

Prismatic Compass and Theodolite

instant at which the tidal current direction and flows neither in or out

Slack Water

consist of large head or front of water generated at the surface of the ocean

Tidal Waves

Different Methods of Locating Sounding

Time Interval Along Range Line, Range Line and An Angle From Shore, Intersecting Range Line, One Angle and Stadia Distance From Shore, Two Angles From Shore, Two Angles From Boat, Distance Along Cross Rope or Wire, Direction or Vertical Angle

simple device in which piano or stranded wire is used and wound on a reel mounted on a stand

Sounding Machine

usually a length of sash or hemp cord, braided flax, or nylon cord,

Leadline

graduated and rounded piece of lumber, about 3 meters long, used for taking soundings.

Sounding Pole

carto

carto

Mesozoic Era

Mesozoic Era

Mesozoic Marine Life and Dinosaurs

Na Me · 26問 · 1年前

Mesozoic Marine Life and Dinosaurs

Cenozoic

Cenozoic

RA 8371 (CHAPTER 1 & 2)

Na Me · 20問 · 1年前

RA 8371 (CHAPTER 1 & 2)

20問 • 1年前

Na Me

RA 8371 (CHAPTER 3 & 4)

Na Me · 15問 · 1年前

RA 8371 (CHAPTER 3 & 4)

RA 8371 (NCIP)

RA 8371 (NCIP)

GS (TOPOGRAPHY)

GS (TOPOGRAPHY)

GS (Leveling, Lesson 6)

Na Me · 21問 · 1年前

GS (Leveling, Lesson 6)

GS (CONTROL SURVEY)

GS (CONTROL SURVEY)

GEO 124 LEC 1

GEO 124 LEC 1

COMA

COMA

GS 2 Control Survey

GS 2 Control Survey

GS 2 - Control Survey

Na Me · 8問 · 1年前

GS 2 - Control Survey

8問 • 1年前

Na Me

Hydrography (Lesson 2)

Na Me · 26問 · 1年前

Hydrography (Lesson 2)

HYDRO (LEC 3)

HYDRO (LEC 3)

Law (Lecture 1)

Law (Lecture 1)

GS 2 (Lec 1 & 2)

GS 2 (Lec 1 & 2)

問題一覧

branch of survey that deals with water bodies

Hydrography

study, description and mapping of ocean, lakes and rivers

Hydrography

process of measuring depth of body of water

Sounding

unit measurement of water

Fathom

1 fathom= ?

6ft

process of making measurements to predict water rate of discharge

Stream Gauging

a map or chart of water

Hydrographic Chart

specific tide levels used as surface of reference for depth measurement

Tidal Datum

volume of water flowing past a section of waterways

Discharge

current or steady flow of water

Stream

process of scooping and sucking up mud

Dredging

imaginary line found on the surface of the Earth underwater

Subaqueous Contour

Steps in Hydrography

Reconnaissance, Establishment of Horizontal Control, Establishment of Vertical Control, Topographic Survey, Hydrography, Preparation of Hydrographic Map

Equipments Used In Hydrographic Surveying

Sextant, Sounding Craft, Sounding Machine, Sounding Pole, Leadline, Fathometer, Signal, Tide Gauge

Rise and Fall of sea level cause by gravitational forces exerted by moon and sun

Tides

Moon and Earth

Lunar Tide

Sun and Earth

Solar Tide

High Tide Above Average, Low Tide Below Average

Spring Tide

Low Tide Above, High Tide Below

Neap Tide

water is falling and moving seaward

Ebb Tide

water surface rising and moving toward shore

Flood Tide

Horizontal Movement of Water

Tidal Current

direction of current flow

Set

speed of current flow

Drift

period which the greatest peak or depression was reached

Stand

Principal Datum Used

Mean Sea Level, Mean Low Water, Mean Lower Low Water, Mean Low Water Spring

two high and two low tides each tidal day

Semidiurnal Tide

one high and one low tide

Diurnal Tide

two high and two low each day

Mixed Tide

Types of Tide Gauges

Registering, Non Registering

Simplest Type of Gauge

Staff Gauge

Consisted of graduated board

Staff Gauge

used when intensity of tide is high and more variation of water level

Float Gauge

consist a weight attached to a brass or wire

Weight Gauge

automatically record the variation of water level within time

Self Registering Gauge

obtained by taking the mean of height of all tides measured at a regular interval of one hour over a stated period

Mean Sea Level

Composition of Sounding Party

Chief of Party, Instrument Man, Recorder, Leads Man, Coxswain, Lookout, Signal Man, Fathometer Attendant

line along which sounding are made

Range Line

required to mark range line

Shore Signal

Range Line = _ Signals

a float made of light wood or hollow air tight vessel

Buoy

Index Glass, Index Arm, Horizon Glass, Pin Hole Plate, Ring Carrying Telescope, Arc, Vernier, Clamp, Tangent Screw, Reading Glass, Handle

a hand driven machine consist of cast iron casing

Weddell's Sounding Machine

measure the depth below the boat on which it is installed

Echo Sounding Machine

Most Common Angle Measureming Instrument

Theodolite, Prismatic Compass, Sextant

used in measuring angle from sounding boat

Sextant

observation are made from the shore

Prismatic Compass and Theodolite

instant at which the tidal current direction and flows neither in or out

Slack Water

consist of large head or front of water generated at the surface of the ocean

Tidal Waves

Different Methods of Locating Sounding

simple device in which piano or stranded wire is used and wound on a reel mounted on a stand

Sounding Machine

usually a length of sash or hemp cord, braided flax, or nylon cord,

Leadline

graduated and rounded piece of lumber, about 3 meters long, used for taking soundings.

Sounding Pole