Question Bank • QB_SWCE_EXP_038 MSQ • 2 Marks

Section 4: Soil and Water Conservation Engineering

Soil and Water Erosion

Subtopic: Mechanics of soil erosion – wind and water erosion

Question Statement:

Which of the following transport mechanisms occur during wind erosion?

Options:

  • (A) Saltation ($0.05 - 0.5\text{ mm}$ soil particle diameter)
  • (B) Surface creep ($0.5 - 1.0\text{ mm}$ soil particle diameter)
  • (C) Suspension (
    lt; 0.05\text{ mm}$ soil particle diameter)
  • (D) Liquefaction (
    gt; 2.0\text{ mm}$ soil particle diameter)

Answer Key:

A, B, C

Step-by-Step Solution & Explanation

Wind erosion transports soil via three primary modes: 1. Saltation: Bouncing motion carrying $50\%$ to $70\%$ of total erosion, particle size $0.05 - 0.5\text{ mm}$. 2. Surface creep: Rolling motion driven by saltating impacts, particle size $0.5 - 1.0\text{ mm}$ ($5\% - 25\%$). 3. Suspension: Fine dust carried high into the atmosphere, particle size
lt; 0.05\text{ mm}$ ($3\% - 15\%$). Liquefaction is a seismic/geotechnical phenomenon, not wind erosion.
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