Solar radiation enters a narrow, rectangular, east-west canyon at noon. The vall

Question

Solar radiation enters a narrow, rectangular, east-west canyon at noon. The valley is 100m wide and the sides of the canyon are 100m tall. The walls and floor of the canyon have an albedo of 0.30. Consider how an individual solar beam is depleted by reflection within the canyon. This beam enters the canyon at 45 and strikes the south slope at 70m from the valley floor and is reflected at 90o. Using your computer or graph paper and a straight edge (i.e. Do not draw freehand), draw a diagram showing these exchanges and calculate the effective canyon albedo.

Explanation / Answer

URFACE: .......ROOF......... WALL............ FIELD......... ROCK-SLOPE ================================================================================= SLOPE: ...............20.......... 90.............. ......8 ..................30 ================================================================================= ASPECT: ...........south ........north............. south ...............east ================================================================================= ALBEDO: ...........0.20 ..........0.40 ...............0.25............... 0.20

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