Green–Grey–Blue–Intelligent (GGBI) Framework
A practical framework that integrates ecological, engineered, aquatic, and intelligent infrastructure to support resilience across water and urban systems.
What is the GGBI Framework?
The Green–Grey–Blue–Intelligent (GGBI) Framework organizes how we think about water and urban systems by recognizing four interacting domains: green infrastructure, grey infrastructure, blue systems (rivers, estuaries, coasts), and an intelligent layer that connects data, models, AI tools, institutions, and communities.
GGBI is not a single model or tool. It is a way to structure problems, connect scales, and design portfolios of solutions that combine ecological, engineered, aquatic, and intelligent elements.
The Framework
Core concepts, definitions, and diagrams describing the four domains of the GGBI Framework and how they interact across scales.
The Four Domains
Green, Grey, Blue, and Intelligent: ecological systems, engineered infrastructure, aquatic systems, and the intelligent layer that integrates data, models, and institutional knowledge.
Applications
Urban stormwater, watershed and basin-scale planning, estuarine and coastal processes, flood resilience, climate adaptation, and intelligent monitoring and modeling systems.
Publications & Resources
Selected academic publications, technical reports, teaching materials, and conceptual diagrams related to the GGBI Framework and its domains.
About This Site
Background on the development of the GGBI Framework and how this site synthesizes research, teaching, and practice across water and urban systems.
Founder
Information about Professor Qizhong (George) Guo and the broader body of work that informs the GGBI Framework.