This study evaluates the effect of cloud seeding on the increase of runoff or securing of additional water resources. Unlike previous studies, this study concentrates more on the change of various components of the hydrologic processes. Both the event-based analysis and the annual analysis are conducted to evaluate the change of these components. The Boryeong Dam Basin in Korea is considered as a study basin. The WRF (Weather Research and Forecasting) model is used in the cloud seeding simulation, while the PRMS (Precipitation Runoff Modeling System) model is used in the rainfall–runoff analysis. The target years of this study are 2018 and 2019. As results, the event-based analysis shows that the infiltration, effective rainfall, interflow, and direct runoff are increased relatively more among the eight rainfall-runoff components considered in this study. In particular, the increase of interflow is noticeable. More than 60 % of the increased rainfall is found to contribute to the runoff increase. In the annual analysis, this ratio is found to become even higher. The ratio is estimated to be more than 90 %, which is mostly due to the contribution of baseflow. As important factors controlling the effectiveness of cloud seeding, the effects of antecedent soil moisture and threshold daily rainfall depth on the increase of total runoff are also evaluated. The results show that wet soil condition is more favorable to the successful cloud seeding experiment to secure additional water resources. Also, it is confirmed that the cloud seeding experiment can be more effective when the daily rainfall is more than 20 mm. Finally, the results of this study imply the efficiency of cloud seeding and its economic values are potentially high.

本研究评估了播云对增加径流或确保额外水资源的影响。与以往的研究不同，本研究更多地关注水文过程各组成部分的变化。进行基于事件的分析和年度分析以评估这些组件的变化。韩国保宁大坝盆地被认为是一个研究盆地。WRF（天气研究和预报）模型用于播云模拟，而 PRMS（降水径流建模系统）模型用于降雨径流分析。本研究的目标年份是 2018 年和 2019 年。结果，基于事件的分析表明，入渗、有效降雨、互流、在本研究考虑的八个降雨径流分量中，直接径流和直接径流的增加相对较多。尤其是互流的增加是显着的。发现超过 60% 的降雨增加导致径流增加。在年度分析中，发现这个比率变得更高。该比率估计超过 90%，这主要是由于基流的贡献。作为控制播云效果的重要因素，还评估了前期土壤水分和阈值日降雨深度对总径流量增加的影响。结果表明，湿润的土壤条件更有利于云播试验的成功，以确保额外的水资源。还，经证实，当日降雨量大于20毫米时，播云试验效果更佳。最后，这项研究的结果表明云播种的效率及其经济价值可能很高。