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. Wind drift has a significant influence on the rainfall–runoff relationship in urban high-rise building areas since theoblique rainfall caused by the wind drift can interact with the buildingwalls. However, the impact of the rainfall inclination angle on therainfall–runoff process in urban high-rise building areas has not been studied. In this study, the relationship between wind and therainfall–runoff process in such areas was explored. A theoretical framework has been developed to describe their relationship, including a computationalfluid dynamics (CFD) method to obtain the relationship between wind speedand rainfall inclination and a newly derived equation to describe therelationship between rainfall inclination and the runoff coefficient.Subsequently, a laboratory scale model experiment was conducted to verify the proposed framework. The main results are that (1) the runoff coefficient calculated by the proposed theoretical framework is highly consistent withthat obtained from the laboratory experiment, (2) the runoff coefficient of urban high-rise building areas increases with wind speed and the increaserate is linear with the tangent of the rainfall inclination angle, and (3) the change in the runoff coefficient for the experiment with larger raindrop is0.047 when the wind speed increases from 0 to 5.9 m s−1, while that for theexperiment with smaller raindrop is 0.064, which means that the rainfallwith larger droplets is less influenced by the wind.

The impact of wind on the rainfall–runoff relationship in urban high-rise building areas