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CivilSoil Mechanics
PrevNext

Water transported soils are termed

A

Colluvial

B

Aeolian

C

Lacustrine

D

Alluvial

Correct Answer

тЪЩя╕П TE тАв Technical Concept & PrincipleCivilSoil Mechanics
Option D

Alluvial

Quick Summary:

Alluvial soils are soils transported and deposited by flowing water, such as rivers and streams. These soils typically exhibit stratification and are categorized based on the source and energy of the water flow.

тЪЩя╕ПTETechnical SolutionConcept & Principle
ЁЯТб Explanation

Alluvial soils are soils transported and deposited by flowing water, such as rivers and streams. These soils typically exhibit stratification and are categorized based on the source and energy of the water flow.

ЁЯФв Key Formulas

vтИЭdv \propto \sqrt{d}vтИЭdтАЛ тАФ where vvv is the critical velocity and ddd is the particle diameter, governing transport capacity.

тЪЩя╕П Working Principle

The process begins with the weathering of parent rock, followed by erosion through fluid kinetic energy. As the velocity of the water decreases, the carrying capacity drops, causing the suspended particles to settle in stages according to their size and weight, leading to sedimentary layer formation.

ЁЯУМ Key Points
  • тЦ╕

    Alluvial soil is formed by river action.

  • тЦ╕

    Aeolian soil is transported by wind.

  • тЦ╕

    Lacustrine soil is deposited in lake beds.

  • тЦ╕

    Colluvial soil is deposited by gravity at the base of slopes.

тЬЕ Advantages
  • тЦ╕

    Generally highly fertile and suitable for agriculture.

  • тЦ╕

    Usually covers large areas in river valleys and floodplains.

тЭМ Disadvantages / Limitations
  • тЦ╕

    Can be highly compressible, posing risks for heavy foundation construction.

  • тЦ╕

    Variable particle distribution can lead to differential settlement.

ЁЯЫая╕П Applications / Uses
  • тЦ╕

    Agricultural development.

  • тЦ╕

    Foundation engineering in river basin zones.

ЁЯУД Additional Information
  • тЦ╕

    Option A (Colluvial) refers to gravitational transport.

  • тЦ╕

    Option B (Aeolian) refers to wind-deposited soil (e.g., loess).

  • тЦ╕

    Option C (Lacustrine) refers to deposition in quiet water bodies like lakes.

ЁЯУК Diagram / Illustration
Formation of Alluvial SoilTransporting Energy (Water Flow Velocity)High VelocityLow VelocityDeposition
тЬЕ

D is correct тАФ Alluvial soil is defined as soil that has been transported and deposited by running water.

Core Concepts Used
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Soil genesis Sedimentary transport mechanisms Geological classification of soils
ЁЯТб EXAM TIP

Remember the suffix '-ine' often relates to water (e.g., Lacustrine for lakes, Marine for seas), whereas 'Alluvial' specifically implies riverine activity.

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