## 5 Discussion
### Analysis of Scenario Deduction Results for Typhoon Behinca and Its Cascading Disasters
Through our analysis of emergency activities carried out during the evolution of the typhoon and its cascading disaster scenarios (the knowledge elements involved are marked in green in Figure 10), we found that the priority emergency actions taken by various decision makers are the pre-lowering of river network water levels \(M_{6}\) (71%) during the public opinion development stage, the real-time release of waterlogging risk warnings \(M_{7}\) (75%), multi-departmental collaboration to deal with dangerous situations such as fallen trees and objects \(M_{8}\) (82%) during the peak public opinion stage, the reinforcement of embankments \(M_{9}\) (85%), the evacuation of residents in coastal low-lying regions \(M_{10}\) (84%), the emergency drainage of accumulated water \(M_{11}\) (88%), the opening of temporary resettlement points \(M_{12}\) (89%), and the repair of power facilities \(M_{13}\) (83%) during the public opinion stabilization stage, and the clearing of fallen trees \(M_{14}\) (80%). The government's issuance of a warning \(M_{1}\) before the typhoon, the investigation of hidden dangers in high-altitude structures and outdoor billboards \(M_{2}\), the pre-lowering of river network water levels \(M_{3}\), and the thorough drainage of accumulated water \(M_{15}\) and disinfection of affected areas \(M_{16}\) in relation to the cascading effects of urban waterlogging have received relatively little attention and need to be further emphasized. Additionally, the development of online public opinion is significantly correlated with the evolution of actual disasters, as well as with government issuance of early warnings and emergency measures (the knowledge elements involved are marked in Figure 11). It can be observed that the government has implemented measures such as a Level I response (\(M_{4}\)) and the closure of highways (\(M_{5}\)), reducing public fear about Bebinca being the \"strongest typhoon in history\" (\(D_{2}\)) from 79% to 60%. This indicates that timely and effective government action can significantly alleviate public panic and anxiety. When the waterlogging event (\(C_{3}\)) occurred, the activity level of the online public opinion platform (\(E_{3}\)) was as high as 87%. This indicates that strengthening the guidance of public opinion and information dissemination can effectively alleviate public anxiety and enhance social resilience during disasters. Meanwhile, according to the above public opinion deduction process, in the \(S_{1}\) stage, emergency measures are mainly focused on prevention and preparation--considering both the direct impact of the typhoon and subsequent cascading disasters--such as the government issuing warnings (\(M_{1}\)), identifying hidden dangers (\(M_{2}\)), and pre-lowering river network water levels (\(M_{3}\)), lacking comprehensive consideration of subsequent cascading disasters. In the \(S_{2}\) phase, the government's emergency measures include responding to the direct impact of the approaching typhoon, as well as the resulting floods  
Figure 10: Scenario knowledge element markers for the evolution process of public opinion on typhoon cascading disasters. and transportation issues; these measures include initiating a Level I response (\(M_{4}\)), closing highways (\(M_{5}\)), and issuing flood risk warnings (\(M_{7}\)). In the \(S_{3}\) phase, the government's emergency measures mainly target typhoon landfall and waterlogging. For example, the disposal of fallen trees and fallen objects (\(M_{8}\)), rushing to drain accumulated water (\(M_{11}\)), and strengthening the embankment (\(M_{9}\)); however, there are fewer measures to mitigate the impact of rainstorms. In the \(S_{4}\) stage, the government mainly focuses on responding to the direct effects of facility damage and waterlogging, such as repairing power facilities (\(M_{13}\)) and clearing fallen trees (\(M_{14}\)), while neglecting the public health issues caused by waterlogging.