CHMARL Project
Maritime transport moves 80% of global trade. Yet the systems coordinating it were designed for a world that no longer exists.
Emissions
AI Optimization


The Problem
Every day, thousands of vessels idle outside the world's busiest ports. Trucks queue for hours. Containers sit untouched. Diesel engines run around the clock, pumping carbon into coastal communities.
The global shipping industry accounts for nearly 3% of all greenhouse gas emissions — more than the entire aviation sector. The International Maritime Organization projects these emissions could rise by 50% by 2050 if nothing changes.
Port scheduling today relies on static timetables, manual coordination, and fragmented systems that cannot adapt to real-time conditions. Berth allocation is done days in advance with no mechanism to respond when a storm delays a vessel or a crane breaks down. The result is cascading inefficiency: ships burn fuel waiting for berths, trucks circle terminals for hours, and yard equipment sits idle while containers pile up in the wrong locations.
In Saudi Arabia alone, MAWANI operates 9 commercial ports handling millions of TEUs annually. As the Kingdom accelerates its Vision 2030 logistics transformation, the gap between current port capacity and future demand is widening. Traditional optimization — centralized, rigid, reactive — cannot bridge that gap.
0%
of global trade by sea
0%
of global GHG emissions
0%
projected emission rise by 2050
0
MAWANI commercial ports
What if ports could think?

The Vision
Imagine a port where every vessel, truck, crane, and piece of yard equipment operates as an intelligent agent — aware of its surroundings, communicating with its peers, and making decisions that benefit the entire system. Not through a single central brain, but through a network of collaborative AI agents that learn, adapt, and optimize together.
This is CHMARL — Constrained Hierarchical Multi-Agent Reinforcement Learning. A decentralized AI framework where a high-level strategic planner sets system-wide objectives (emission budgets, throughput targets, fairness constraints), while individual agents at the operational level execute real-time decisions within those boundaries.
The result is a port that breathes. Ships arrive when berths are ready. Trucks are dispatched when containers are staged. Equipment moves before bottlenecks form. Emissions drop because idling stops. And when conditions change — a delayed vessel, a sudden storm, a crane malfunction — the system recalibrates in real time without human intervention.
And critically, humans remain in control. CHMARL recommends. Operators decide. The AI serves the people who run the port, not the other way around. Every recommendation is explainable, every decision is auditable.

Congestion & Emissions
AI-Optimized Flow

Today
Ports as they are.

Tomorrow
Ports as they should be.
The Approach
Traditional port optimization attempts to solve everything from a single point — one algorithm, one model, one decision-maker. This approach breaks down at scale. Real ports are too dynamic, too complex, and too distributed for any single system to manage effectively. When a centralized optimizer encounters unexpected conditions, the entire plan collapses.
CHMARL takes a fundamentally different path. Using cooperative hierarchical multi-agent reinforcement learning, the system operates on two tiers. At the strategic level, a high-level planner sets emission budgets, throughput targets, and fairness constraints using a primal-dual optimization framework that provably bounds cumulative emissions. At the operational level, each entity in the port — every vessel, every truck, every crane — is represented by its own AI agent that makes real-time decisions within those constraints.
These agents learn to cooperate, negotiate, and optimize collectively — much like a flock of birds that moves in perfect formation without a leader. A fairness-aware reward transformer with dynamically scheduled penalties ensures that no single operator is disadvantaged, achieving max-min cost equity across heterogeneous fleets.
And because the intelligence is distributed, the system is resilient. If one agent fails, the others adapt. If conditions change suddenly, the network recalibrates. The two-tier architecture enables linear scaling in agent count — meaning CHMARL can grow from a single terminal to an entire national port network without fundamental redesign.
AI-Coordinated Port Operations
Ships dock at optimized berths, gantry cranes coordinate loading sequences, and autonomous vehicles shuttle cargo — all orchestrated by CHMARL's decentralized AI agents communicating in real time.

01
+12%
throughput improvement
Reduce vessel turnaround times and increase container throughput through intelligent scheduling and real-time coordination across all port operations.
02
-15%
emission reduction per TEU
Cut port-related emissions by eliminating unnecessary idling, optimizing routes, and enforcing real-time emission budgets with provable guarantees.
03
45%
fair-cost improvement
Ensure equitable resource allocation across all port stakeholders through a fairness-aware reward mechanism — no single operator is disadvantaged by the system.
How It Works
The high-level tier ingests system-wide data — weather forecasts, demand projections, emission budgets, and fairness constraints. It computes optimal resource allocation plans and distributes them as boundary conditions to the operational agents below.
Each vessel, truck, crane, and piece of yard equipment runs its own lightweight AI agent. These agents observe local conditions, communicate with nearby peers, and make real-time decisions — berth selection, route adjustment, task sequencing — all within the strategic boundaries set above.
"The AI recommends. The human decides. Every recommendation is explainable, every decision is auditable. CHMARL is a tool for port operators — not a replacement."
Strategic Alignment
CHMARL is designed to directly support Saudi Vision 2030's logistics transformation goals, the Saudi Green Initiative's emission reduction targets, and the International Maritime Organization's 2050 decarbonization mandate.
Saudi Vision 2030
Logistics hub transformation and economic diversification
Saudi Green Initiative
Net-zero emissions and environmental sustainability
IMO 2050
International maritime decarbonization mandate
Interactive Demo
See how CHMARL's AI agents coordinate vessel arrivals, berth assignments, and cargo operations in real time.
Throughput
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vessels/min
Emissions
0
tons CO₂
Avg Wait
0
sec
Fairness
0.64
index
Media & News
Live feed
gCaptain
7h ago
gCaptain
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gCaptain
13h ago
These headlines illustrate why projects like CHMARL matter — the maritime industry faces unprecedented challenges that demand AI-driven solutions.
The Team
CHMARL was created by the AI and Sustainability Research Group at Al-Baha University, Saudi Arabia, led by Dr. Saad Alqithami. The project emerged from years of research into multi-agent systems, reinforcement learning, and sustainable transportation — and a conviction that these technologies should serve the places that need them most.
The project is developed in partnership with IBM through the IBM Sustainability Accelerator program, which provides cloud infrastructure, AI tooling, and mentorship to scale solutions that address environmental and social challenges.
Get in Touch
Whether you are a port authority, a logistics operator, a researcher, or simply curious — we would love to hear from you.
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