Subsidence in Coastal Settlements

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Questions and Answers

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?

<p>Urban expansion and fish ponds (D)</p> Signup and view all the answers

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

<p>Increased susceptibility to storm surges and tidal inundations (C)</p> Signup and view all the answers

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

<p>1,236 acres (C)</p> Signup and view all the answers

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

<p>Japan Meteorological Agency (JMA) (D)</p> Signup and view all the answers

What is the purpose of wind data in the research?

<p>To conduct flow simulations within Delft3D (A)</p> Signup and view all the answers

What are the two key parameters required for wind data?

<p>Wind intensity and radius of maximum wind speeds (D)</p> Signup and view all the answers

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

<p>National Mapping and Resource Information Authority (NAMRIA) (C)</p> Signup and view all the answers

What is the purpose of acquiring topographic and bathymetric maps?

<p>For precise delineation of the study area (C)</p> Signup and view all the answers

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

<p>From 1923 to 2023 (B)</p> Signup and view all the answers

What is the common characteristic of Categories Three and Four?

<p>They produce catastrophic damage that can affect a high percentage of framed homes, trees, and power poles. (C)</p> Signup and view all the answers

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

<p>276.28 cm (A)</p> Signup and view all the answers

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

<p>5-year return period (B)</p> Signup and view all the answers

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

<p>Kawit (C)</p> Signup and view all the answers

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

<p>301.477 cm (D)</p> Signup and view all the answers

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

<p>327.870 cm (C)</p> Signup and view all the answers

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

<p>Weeks or months (D)</p> Signup and view all the answers

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

<p>Obando (D)</p> Signup and view all the answers

What is the purpose of Table 4.2.1?

<p>To contain the average tidal height of each Typhoon with a 5-year return period. (A)</p> Signup and view all the answers

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

<p>291.236 cm (D)</p> Signup and view all the answers

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

<p>27.259 cm (A)</p> Signup and view all the answers

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

<p>Hagonoy (A)</p> Signup and view all the answers

What was the lowest average tidal height recorded in Orion?

<p>25.400 cm (B)</p> Signup and view all the answers

What was the highest average tidal height recorded in Orion?

<p>325.600 cm (D)</p> Signup and view all the answers

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

<p>Furrowed (A)</p> 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.?

<p>Induce harmful rip currents (A)</p> Signup and view all the answers

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

<p>To mitigate risks to coastal communities and infrastructure (A)</p> Signup and view all the answers

What is the purpose of the hazard map analysis?

<p>To analyze wave heights across various return periods (A)</p> Signup and view all the answers

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