Occurrence of natural hazards is affected by : (a) Land use changes (b)…
2017
Occurrence of natural hazards is affected by :
(a) Land use changes
(b) Drainage and construction
(c) Ozone depletion
(d) Climate change
Choose the correct answer from the code given below :
Answer: C. (a), (b) and (d) — CONCEPTThe occurrence of a natural hazard changes when land-surface processes, built drainage or slope conditions, or climate drivers alter the physical…
- A.
(a), (c) and (d)
- B.
(a), (b) and (c)
- C.
(a), (b) and (d)
- D.
(b), (c) and (d)
Attempted by 1 students.
Show answer & explanation
Correct answer: C
CONCEPT
The occurrence of a natural hazard changes when land-surface processes, built drainage or slope conditions, or climate drivers alter the physical triggers of the event.
This must be distinguished from an environmental change that mainly affects exposure or health without directly changing the occurrence of floods, landslides, cyclones, or similar hazards.
APPLICATION
Land-use changes such as deforestation or paving alter infiltration, runoff, and slope stability, thereby affecting floods and landslides.
Drainage works and construction change flow paths, surface loading, and slope geometry, thereby affecting flooding and slope failure.
Ozone depletion mainly reduces stratospheric filtering of ultraviolet radiation; it is not a direct physical trigger for the occurrence of these natural hazards.
Climate change alters temperature, moisture, sea level, and atmospheric circulation, thereby changing the frequency or intensity of several weather-related hazards.
CROSS-CHECK
Applying the trigger test, land-use change, drainage and construction, and climate change each modify conditions that generate or intensify hazards; ozone depletion chiefly changes ultraviolet exposure.
Therefore, the applicable combination is land-use changes, drainage and construction, and climate change.