Urban climatology modeling of aero dynamics forcing effect derived from roughness buildings

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We developed an elaborated direct measurement system for drag force acting on a buildings block area. By using this device, systematic and comprehensive wind tunnel experiments to identify the so-called Bulk Drag (Momentum) Transferring Coefficients for various cases targeted at realistic urban situations represented by several complex geometric parameters. We also developed a measurement system for accurate evaporation rate from water surface based on the so-called Salinity Method. By means of this, we conducted another series of wind tunnel experiments to obtain the so-called Drag Scalar Transferring Coefficients. Those two series of experiments are designed to be comparable in terms of having same geometric parameters. Huge amount of the experimental data sets leads to clarify what geometric parameter dominates on both momentum and scalar transfer within/ just above urban canopy. To the end, turbulent transferring effects for both momentum and scalar are enforced by "randomness" resulting from building height distribution, roughness array.