E214 都市接地境界層における運動量、熱、水蒸気、CO_2 の乱流輸送特性 [in Japanese] Turbulent transfer of momentum, heat, vapor, and CO_2 in urban surface layer [in Japanese]
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A long-term field measurement is performed to investigate turbulent transfers in a densely built-up urban surface layer. The ratios of fluxes measured at two heights are almost unity. We can expect the existence of the surface layer in this residential area. The turbulent transfer efficiencies of momentum, heat, vapor, and CO_2 are examined. Following results are obtained; 1) The ratio for heat/momentum is smaller the results in Kansas experiment. This behavior is expected over an urban surface where form drag due to bluff-body effects of buildings increases the transfer efficiency of momentum compared to scalar transfers. 2) The transfer efficiencies of vapor and CO_2 are smaller than that of heat. 3) Wavelet analysis shows this reason. Thermal structures and organized structures transfer heat efficiently. Vapor and CO_2 are also transferred as well as heat by some structures. But they are not or adversely transferred by other structures.
日本流体力学会年会講演論文集 2002, 332-333, 2002