Real-time data exchange, coordination, and awareness require reliable communication systems, while the coastal ecosystems require protection. Having self-healing properties makes cost-efficient Wireless Mesh Networks (WMNs) expandable solutions for the above-mentioned issues. On the contrary, complex maritime topology shifts, severe weather, and high electromagnetic interference all present unique difficulties which can undermine network security and reliability. In this work, we review the architecture and optimization challenges of dependable WMNs for coastal and maritime monitoring and operations. We study the primary metrics of performance: latency, energy efficiency, throughput, network resilience and others, while uncovering vulnerabilities in node failure, link degradation, and cyber-attacks. Simultaneously, the study emphasizes WMNs functionality in harsh coastal climates through a combination of practical case studies and simulation assessments. The results highlight the need for continuously available, high-quality communication, intelligent disruption control, dynamic routing measures, and upgraded security protocols. The findings of this work enhance next-generation maritime communication systems to enable safer oceanographic studies and streamline traffic, while integrating environmental protection measures and strengthening military defense systems.