Abstract This study proposes an empirical equation that estimates the amount of wind-driven rain (WDR) on a building wall, meaning the amount of rainfall intercepted by a building wall. The proposed equation was formulated by analyzing the results obtained in previous studies on the vertical profile and spatial distribution of WDR on building walls. A laboratory experiment was conducted to collect WDR measurements for several building wall models that fit the proposed empirical equation. This study also observed the WDR for a miniature building located on the rooftop of the Engineering Building of Korea University. The proposed empirical equation was validated by comparing its estimates to in-situ observations. The results indicate that the estimations and the observed results are similar overall, but there are some discrepancies particularly when the WDR is small, with a correlation coefficient of 0.71 and root mean square error of 1.90 mm/hr⋅m2. This study also estimates the amount of rainwater that can be collected from a building wall. The result shows that, even for a small building with a ratio of building wall to building roof of one, the amount of rainfall intercepted by the building wall can be up to 50% of the amount of rainwater collected on the building roof. This finding supports the idea that the WDR from a building wall can be a significant source of harvested rainwater.

中文翻译：

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建筑墙体风驱雨量测量试验及现场验证

摘要 本研究提出了一个经验方程，用于估计建筑物墙壁上的风驱动降雨 (WDR) 量，即建筑物墙壁拦截的降雨量。所提出的方程是通过分析先前关于 WDR 在建筑物墙壁上的垂直剖面和空间分布的研究中获得的结果而制定的。进行了一项实验室实验，以收集符合建议的经验方程的几种建筑墙体模型的 WDR 测量值。本研究还观察了位于高丽大学工程大楼屋顶的微型建筑的 WDR。通过将其估计值与现场观测值进行比较，验证了所提出的经验方程。结果表明估计和观察到的结果总体相似，但存在一些差异，特别是当 WDR 较小时，相关系数为 0.71，均方根误差为 1.90 mm/hr⋅m2。这项研究还估计了可以从建筑物墙壁收集的雨水量。结果表明，即使是建筑物墙体与屋面之比为1的小型建筑物，建筑物墙体截留的降雨量也可以达到建筑物屋面收集雨水量的50%。这一发现支持了这样一种观点，即建筑物墙壁的 WDR 可能是收集雨水的重要来源。即使是建筑物墙体与屋面之比为1的小型建筑物，建筑物墙体截留的雨水量也可高达建筑物屋面收集雨水量的50%。这一发现支持了这样一种观点，即建筑物墙壁的 WDR 可能是收集雨水的重要来源。即使是建筑物墙体与屋面之比为1的小型建筑物，建筑物墙体截留的雨水量也可高达建筑物屋面收集雨水量的50%。这一发现支持了这样的观点，即建筑物墙壁的 WDR 可以成为收​​集雨水的重要来源。