Subsidence in Coastal Settlements

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What is the primary cause of subsidence in coastal settlements near the national capital?

Tectonic plate movement

Rising sea levels

Depletion of the water table (correct)

Compaction of sandy soil

How much has the land subsided in Bulacan and Pampanga since 2003?

1 1/2 to 2 1/2 inches (correct)

3 1/2 to 4 inches

1 to 1 1/2 inches

2 1/2 to 3 1/2 inches

What was the original area of mangrove forests in Manila Bay in the late 19th century?

160,000 acres

80,000 acres

40,000 acres

133,400 acres (correct)

What has contributed to the decline of mangrove forests in Manila Bay?

Urban expansion and fish ponds Signup and view all the answers

What is one of the ecological implications of the loss of mangrove forests in Manila Bay?

Increased susceptibility to storm surges and tidal inundations Signup and view all the answers

What is the current area of mangrove trees remaining in Manila Bay?

1,236 acres Signup and view all the answers

What is the primary international authority responsible for cataloging typhoon data affecting the Philippines?

Japan Meteorological Agency (JMA) Signup and view all the answers

What is the purpose of wind data in the research?

To conduct flow simulations within Delft3D Signup and view all the answers

What are the two key parameters required for wind data?

Wind intensity and radius of maximum wind speeds Signup and view all the answers

Which organization will provide the tide data records of Manila Bay?

National Mapping and Resource Information Authority (NAMRIA) Signup and view all the answers

What is the purpose of acquiring topographic and bathymetric maps?

For precise delineation of the study area Signup and view all the answers

What is the time period for which typhoon records were collected?

From 1923 to 2023 Signup and view all the answers

What is the common characteristic of Categories Three and Four?

They produce catastrophic damage that can affect a high percentage of framed homes, trees, and power poles. Signup and view all the answers

What is the lowest average tidal height recorded on typhoon WILDA in Kawit?

276.28 cm Signup and view all the answers

What is the return period of the average tidal height data in Table 4.2.1?

5-year return period Signup and view all the answers

In which location did typhoon DEANNA record the lowest average tidal height?

Kawit Signup and view all the answers

What is the average tidal height of Typhoon MIRINAE in Manila?

301.477 cm Signup and view all the answers

What is the highest average tidal height recorded on typhoon NORU in Manila?

327.870 cm Signup and view all the answers

How long will most of the area be uninhabitable for after a Category Three or Four typhoon?

Weeks or months Signup and view all the answers

In which location did typhoon NALGAE record the highest average tidal height?

Obando Signup and view all the answers

What is the purpose of Table 4.2.1?

To contain the average tidal height of each Typhoon with a 5-year return period. Signup and view all the answers

What is the average tidal height of Typhoon RAMMASUN in Orion?

291.236 cm Signup and view all the answers

What is the lowest average tidal height recorded on typhoon KIM in Manila?

27.259 cm Signup and view all the answers

In which location did typhoon GONI record the highest average tidal height?

Hagonoy Signup and view all the answers

What was the lowest average tidal height recorded in Orion?

25.400 cm Signup and view all the answers

What was the highest average tidal height recorded in Orion?

325.600 cm Signup and view all the answers

What is the term used to describe the potential of wave heights to cause significant disturbances?

Furrowed Signup and view all the answers

What is the consequence of even relatively small waves, according to the Eastern Long Island Coastal Conservation Alliance, Ltd.?

Induce harmful rip currents Signup and view all the answers

What is the importance of recognizing wave heights, according to the analysis?

To mitigate risks to coastal communities and infrastructure Signup and view all the answers

What is the purpose of the hazard map analysis?

To analyze wave heights across various return periods Signup and view all the answers