Coastal zones are an important hub for land-sea connectivity and are vital to ecological security and regional economic growth. Using the human-nature interaction theory as a case study, this study builds a six-dimensional assessment framework that includes “society-economy-resources-ecology-technology-digital.” We conduct a systematic analysis of the spatiotemporal evolution and driving mechanisms of human-nature system coupling coordination in the region from 2005 to 2022 using an integrated methodological approach that includes variable fuzzy recognition, coupling coordination degree, gravity center migration, and spatial econometric. Key findings show that (1) the land subsystem shows phased variations influenced by reclamation and comparable anthropogenic activities, while the human subsystem shows general developmental growth with notable regional inequalities. (2) Although economic-ecological imbalances create localized regression in some counties, the degree of coupling coordination shows overall improvement with larger intermediate coordination zones. (3) While annual temperature and nighttime light intensity show nonlinear threshold effects, coordination is much improved by the environmental investment ratio, NDVI, and fiscal spending. (4) Analysis of spatial heterogeneity reveals unique processes of influence in the north, west, and south, requiring diverse approaches to governance. Therefore, in order to promote coordination of the coastal human-nature system, we suggest policy approaches such as enhanced ecological resilience, science-based economic planning, and optimal environmental investment structures. This study supports the goals of sustainable land-sea integration by offering theoretical and practical insights for coastal spatial governance.
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