Question

Match List-I with List-II

List-I (Soil erosion/structures)	List-II (Scientist/Researcher)
(A) Raindrop	(III) Hall
(B) Drop spillway	(V) Blaisdell and Donnelly
(C) Wind erosion	(IV) Skidmore and Woodruff
(D) Chute spillway	(I) Blaisdell and Huff
(E) Stream channel erosion	(II) Mavis

• (A) - (III), (B) - (I), (C) - (IV), (D) - (V), (E) - (III)
• (A) - (IV), (B) - (III), (C) - (V), (D) - (II), (E) - (I)
• (A) - (II), (B) - (IV), (C) - (V), (D) - (I), (E) - (III)
• (A) - (III), (B) - (V), (C) - (IV), (D) - (I), (E) - (II)

Hint:

- Skidmore and Woodruff are synonymous with the Wind Erosion Equation (WEQ).
- St. Anthony Falls (SAF) spillway designs were primarily standardized by Blaisdell.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The development of soil erosion equations and hydraulic design criteria for conservation structures is credited to pioneering researchers who developed standard formulas through laboratory and field modeling.

Step 2: Detailed Explanation:
Let us match the erosion processes/structures with the corresponding researchers:
- (A) Raindrop erosion:
C. W. Hall (along with other researchers like Ellison) conducted pioneering studies on the physics of soil erosion, specifically focusing on the impact of raindrops on soil aggregates.
Thus, (A) matches with (III).
- (B) Drop spillway:
Blaisdell and Donnelly (1966) at the St. Anthony Falls (SAF) Hydraulic Laboratory developed the standard design criteria and stilling basin dimensions for straight drop spillways.
Thus, (B) matches with (V).
- (C) Wind erosion:
Skidmore and Woodruff (1968) are highly famous for their extensive research on wind erosion mechanics, which led to the development of the Wind Erosion Equation (WEQ).
Thus, (C) matches with (IV).
- (D) Chute spillway:
Blaisdell and Huff (1979) conducted detailed model investigations and developed standard design criteria for chute spillway inlets and SAF stilling basins.
Thus, (D) matches with (I).
- (E) Stream channel erosion:
F. T. Mavis (1930s) conducted early fundamental research on the transportation of bed load, critical tractive force, and stream channel erosion mechanics.
Thus, (E) matches with (II).
Combining these matches, we get: (A)-(III), (B)-(V), (C)-(IV), (D)-(I), (E)-(II).

Step 3: Final Answer:
The correct matching sequence corresponds to Option D.