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HYDROLOGY > LESSON 3 > Flashcards

LESSON 3 Flashcards

1
Q

About ________ of the total precipitation that falls on continental areas is turned to the seas by direct _______________

A

1/4 ; runoff and underground

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2
Q

The Philippines receives an average of __________ mm of rainfall every year. However, the amount is not __________ distributed over time and space

A

2,360 mm or 2.360 m ; evenly

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3
Q

The rainfall patter in the Philippines is affected by the major streams by the movement of the ___________ and by the ________________

A

ITCZ and cyclonic disturbance

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4
Q

The Philippines has a mean annual number of about ______ rainy day

A

175

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5
Q

What are the 3 requirements for precipitation to occur

A
  1. Cooling of the air mas sufficient to bring it to or near saturation
  2. Presence of condensation or freezing nuclei
  3. Growth of water droplets
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6
Q

Any product of condensation of atmospheric water vapor in the free air or at the earth’s surface

A

Hydrometeor

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7
Q

Types of Hydrometeor

A

Drizzle or mist
Rain
Glaze
Rime
Snow
Hail
Sleet

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8
Q

Consist of liquid water drops mostly larger than 0.5 mm in diameter

A

Rain

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9
Q

Consist of tiny liquid water droplets

A

Drizzle or Mist

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10
Q

Ice coating on exposed surface by the freezing of supercooled water ; transparent

A

Glaze

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11
Q

White, opaque deposit of ice granuled

A

Rime

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12
Q

Composed of ice crystals ; snowflakes

A

Snow

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13
Q

Precipitation in the form of balls of ice

A

Hail

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14
Q

Consist of transparent, globular, solid grains of ice formed by the freezing of rain drops.

A

Sleet

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15
Q

TYPES OF PRECIPITATION ACCORDING TO LIFTING MECHANISM

A

Convective
Orographic
Frontal
Cyclonic

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16
Q

It is caused by unequal heating of land masses

A

Convective

17
Q

Mechanical lifting over mountain barriers

A

Orographic

18
Q

Lifting of warm air on one side of a frontal surface over colder, denser air on the other side (front-bounding surface between two distinct air masses)

A

Frontal

19
Q

Lifting of air converging into a low pressure area

A

Cyclonic

20
Q

Rainfall Characteristics

A

Intensity
Duration
Frequency

21
Q

Expressed in mm/hr

A

Intensity

22
Q

Return period or recurrence interval; Period within which magnitude of a hydrological event will be equaled or exceeded once in the average

A

Frequency

23
Q

TRUE OR FALSE
Correct interpretation of precipitation data is important to avoid miscalculated conclusions

A

False, Erroneous conclusions

24
Q

The quality of precipitation data is affected by change in:

A

gage location
gage exposure
instrumentation
observational procedure

HYDROLOGY (7 decks)

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