Which of the following is an effect of coastal floods?

The choice detailing property damage and ecological impact as an effect of coastal floods is accurate due to the nature of flooding events caused by storms, high tides, or heavy rainfall. When coastal areas experience flooding, infrastructure such as homes, businesses, and roads can suffer significant damage, leading to costly repairs and disruptions in community function.

Additionally, the ecological impact can be severe, as floods often alter habitats, displace wildlife, and introduce pollutants into marine and estuarine environments. Floodwaters can bring about erosion, diminish plant and animal populations, and change the composition of ecosystems, which can have long-lasting effects on biodiversity and the health of coastal regions.

The remaining options do not represent the typical consequences of coastal floods. Increased biodiversity is generally not a direct result of flooding, as floods can harm habitats. The option mentioning the expansion of coastal tourist activities overlooks the potential for disaster-related restrictions on travel and access. Lastly, while coastal ecosystems might occasionally adapt over time, flooding typically disrupts and weakens these systems in the short term rather than strengthening them immediately.