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</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</p> Signup and view all the answers

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

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

    What is the purpose of wind data in the research?

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

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

    <p>From 1923 to 2023</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.</p> Signup and view all the answers

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

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

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

    <p>Kawit</p> Signup and view all the answers

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

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

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

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

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

    <p>Obando</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.</p> Signup and view all the answers

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

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

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

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

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

    <p>Hagonoy</p> Signup and view all the answers

    What was the lowest average tidal height recorded in Orion?

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

    What was the highest average tidal height recorded in Orion?

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

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