| |-= | | Styles Text Box 2. You are working for the highway and need to protect
ID: 287758 • Letter: #
Question
| |-= | | Styles Text Box 2. You are working for the highway and need to protect the road from blowing snow using a snowfence. The site is flat, and the road is perpendicular to the prevailing wind. You decide to install a 3 meter high snOw fence with 50% porosity.(10 points) o How far from the road must the snowfence be in meters so that the lee drift ends at the edge of the road? For the lee drift, what is the maximum snow depth? what is the cross-sectional area of the lee drift? What is the total water storage from both windward and leeward drifts per meter of fence? o B 83Explanation / Answer
1. For a snowfence having 50% porosity, the leeward extends upto 35 times the height of the snowfence. So, the fence must be installed at a distance of (35 * 3), i.e. 105m from the road.
2. The maximum snow depth of the leeward drift is upto 1.2 times the height of the snowfence having 50% porosity. In this case, it is 3.6m.
3. Given that the height (H) of the snowfence is 3m, the cross-sectional area of the leeward drift is 1/2 * 35H* 1.2H = 189m2
4. The water storage (Qc) of the drift per meter of fence can be calculted using the relation : Qc = (3 + 4P + 44P2 - 60P3) * H2.2 (Tabler, 2003)
Thus, Qc = (3 + 4 * 0.5 + 44 * 0.25 - 60 * 0.125) * 32.2 = (3 + 2 + 11 - 7.5) * 11.21 = 95.285 tons per meter
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