Although humans have a long history of living on the water, in the twenty-first century, the urban seascape has emerged as a new frontier for aquatic urbanism in coastal cities affected by sea level rise. The evolution of aquatic urbanism is influenced by innovative floating technologies which may ultimately form floating cities in the future. To work with dynamic marine environments, planning urban seascapes may have to be entirely different from land-based urbanism and planning. The key question addressed in this chapter is how an adaptive planning tool can be created to regulate marine space and position floating developments dynamically as part of natural ecosystems. The chapter proposes a computationally implemented system for planning and managing adaptive dynamic marine zones. Enabled by such a digital planning tool, dynamic zoning in spatiotemporal dimensions has the potential to facilitate the adaptive evolution of aquatic urbanism in dynamic marine ecosystems and, ultimately, better integrate human-made and natural ecosystems.