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. The north-west (NW) Mediterranean coastal zone is a populous and well-developed area in which the impact of natural hazards like flash floods andcoastal storms can result in frequent and significant damages. Although the occurrence and impacts of such hazards have been widely covered, fewstudies have considered their combined impact on the region, which would result in more damage. Within this context, this study analyses theoccurrence and characteristics of compound extreme events of heavy rainfall episodes (as a proxy for flash floods) and coastal storms (using themaximum significant wave height) along the Catalan coast as a paradigm of the NW Mediterranean. Two different types of events are considered:multivariate, in which the two hazards occur at the same location, and spatially compounding, in which they occur within the same limited timewindow, and their impacts accumulate at distinct and separate locations. The analysis is regionally performed along a coastline extension of about600 km by considering seven coastal sectors and their corresponding river catchment basins. Once the compound events are analysed, the synopticatmospheric pressure fields are analysed to determine the prevailing weather conditions that generated them. Finally, a Bayesian network is used tofully characterize these events over the territory. The obtained results show that the NW Mediterranean, represented by the Catalan coast, has ahigh probability of experiencing compound extreme events. Despite the relatively small size of the study area, there are significant variations inthe event characteristics along the territory, with the most frequent type being spatially compound, except in the northernmost sectors wheremultivariate events dominate. These northern sectors also present the highest correlation in the intensity of both hazards. Three representativesynoptic situations have been identified as dominant for the occurrence of these events, with different relative importance levels of thecompounding drivers (rainfall and waves) and different distributions of impacts across coastal basins. Overall, results obtained from specificevents indicated that heavy rainfall is related to the most significant impacts despite having a larger spatial reach.

Classifying compound coastal storm and heavy rainfall events in the north-western Spanish Mediterranean