Core Viewpoint - The construction of a comprehensive seawater intrusion prevention and control system in Guangzhou represents a proactive shift in safeguarding water security in coastal megacities amid climate change challenges, including rising sea levels and extreme weather events [3]. Group 1: Monitoring and Data Collection - Guangzhou's planning and natural resources bureau has conducted a comprehensive survey of key coastal areas, covering nearly 1,400 square kilometers and over 300 kilometers of geophysical exploration, revealing the three-dimensional spatial distribution of freshwater and saltwater interfaces [5]. - The establishment of a monitoring network includes 60 new monitoring points and 114 layered monitoring wells, enabling hourly collection and remote transmission of key groundwater parameters [5]. Group 2: Risk Assessment and Early Warning - A dual-track early warning threshold system has been developed, categorizing risk levels by region, with high-level alerts for saline areas and sensitive alerts for freshwater protection zones [7]. - The system features an automatic triggering mechanism that promptly sends out warning information when key indicators exceed limits, enhancing the precision of risk management [7]. Group 3: Integrated Management and Decision Support - The creation of a "marine digital twin system" allows for high-precision three-dimensional hydrological models based on real-time monitoring data, facilitating a full-chain management mechanism from monitoring to decision-making [9]. - The integrated system combines intelligent perception, dynamic assessment, graded warnings, and coordinated responses, contributing to high-quality marine governance and sustainable urban development [9].

Core Points - The "Fourth National Smart Ocean Big Data and Artificial Intelligence Application Innovation Competition (2025)" has officially commenced, aiming to promote research and innovative applications in smart ocean big data and marine artificial intelligence, facilitating high-quality development in the marine sector [1] - The competition serves as a significant avenue for leveraging data application value and accelerating the implementation of artificial intelligence technologies, fostering innovation and integration within the marine digital industry ecosystem [1] - The competition features four main categories: marine big data, marine artificial intelligence and large models, marine digital twins, and marine intelligent equipment, focusing on practical application cases with an emphasis on originality, technological advancement, and practical scenarios [1] Industry Insights - Since its inception in 2022, the competition has successfully hosted three editions, showcasing numerous exemplary cases of marine big data empowering the transformation and upgrading of traditional marine industries, as well as creative solutions for risk management through digitalization [2] - The competition has established itself as an open platform for innovation in concepts, technology research and development, and talent aggregation in the marine big data field, characterized by broad participation, strong interactivity, and high technical standards [2]