Leaching outdoor tests (LOT) are commonly used to assess the leaching of substances from construction materials. In this context, the amount of stormwater in contact with the surface material is of special interest for analyzing the runoff loads of substances from building facades. A numerical model was developed in MATLAB on the basis of previous analytical models to calculate the collected stormwater runoff volumes from the vertical test panels (VTP) during LOT. In the model, wind-driven rain (WDR) is considered to be the main mechanism for determining the amount of water impinging on the VTP, so it is a crucial factor in the modeling for the facade runoff. The new model makes it possible to simulate the runoff volumes from VTP that are covered with a wide variety of plaster and mortar. Using the new model, it was possible to relate the VTP runoff volumes obtained during an 18-month sampling period for LOTs performed at the Fraunhofer Institute for Building Physics in Valley, Germany. When comparing the simulation results with the field test accumulated runoffs, the model exhibited a difference of no more than 3.5% for each of the analyzed materials. The simulation results are satisfying, and the paper demonstrates the feasibility of the modelling approach for the runoff assessment of VTP covered with a variety of plaster and mortar.

中文翻译：

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在涂有灰泥和砂浆的垂直测试板上开发雨水径流预测模型

室外浸出试验 (LOT) 通常用于评估建筑材料中物质的浸出情况。在这种情况下，与表面材料接触的雨水量对于分析建筑物外墙物质的径流载荷特别重要。在以前的分析模型的基础上，在 MATLAB 中开发了一个数值模型，以计算 LOT 期间从垂直测试面板 (VTP) 收集的雨水径流量。在模型中，风驱动雨（WDR）被认为是确定撞击 VTP 水量的主要机制，因此它是立面径流建模的关键因素。新模型可以模拟被各种石膏和砂浆覆盖的 VTP 的径流体积。使用新模型，可以关联在德国瓦利弗劳恩霍夫建筑物理研究所进行的 LOT 的 18 个月采样期间获得的 VTP 径流量。当将模拟结果与现场测试累积径流进行比较时，模型显示每种分析材料的差异不超过 3.5%。仿真结果令人满意，论文证明了该建模方法用于各种石膏和砂浆覆盖的 VTP 径流评估的可行性。