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

我们开发了一种复杂的直接测量作用于建筑物块区域的阻力的系统。利用该装置，针对由多个复杂几何参数表示的现实城市情况，进行了系统而全面的风洞实验，以识别各种情况下的所谓整体阻力(动量)传递系数。我们还研制了一套基于盐度法的水面蒸发精确测量系统。在此基础上，我们又进行了一系列风洞实验，得到了所谓的阻力标量传递系数。这两个系列的实验被设计成具有相同的几何参数，具有可比性。大量的实验数据表明，什么几何参数对城市冠层内/上方的动量输送和标量输送起主导作用。最后，动量和标量的湍流传输效应都是由建筑物高度分布、粗糙度阵列引起的“随机性”所加强的。

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.