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{"ops":[{"insert":"Mean wind speeds u(z), averaged over 30 minutes, were measured simultaneously at several heights z above a plantation in conditions when a logarithmic wind profile was expected. Results are shown in the table below. A graph of u(z) vs ln(z-d) is also shown below. The height h of the plantation is 6 m.\n\n\u00a0u (m\/s) - 2.7; 3.3; 3.7; 4.1; 4.4; 4.7\nz (m) - 10;\u00a020; 30;\u00a040; 50; 60\n\n\u00a0Graph of windpeed (u) vs ln (z-d) \n\u00a0y = 1.0963x - 0.9741\u00a0\n\nAssume the zero plane displacement d was 4.0 m. Use von Karman\u2019s constant k = 0.41\na) Using the graph determine the roughness length of the canopy. \nb) Using the graph determine the friction velocity.\n"}]}
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