SHI and Caspian Port Dynamics in Iran: April 9–10, 2026

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Method Note: SHI and Caspian Throughput

Ports are grouped into two systems: Caspian (north) and Persian Gulf (south).
System performance is measured using a System Health Index (SHI):

SHI=100×(0.45F+0.35Q+0.20B)SHI = 100 \times (0.45F + 0.35Q + 0.20B)SHI=100×(0.45F+0.35Q+0.20B) 

• FFF: Flow absorption (departures vs inflow) 
• QQQ: Queue efficiency (anchorage share) 
• BBB: Flow balance (departures vs arrivals) 

SHI > 70 indicates efficient flow; < 50 indicates congestion.

Caspian throughput is estimated as:

Throughput≈Departures×2,000–4,000×(0.5–0.8)Throughput \approx Departures \times 2{,}000\text{–}4{,}000 \times (0.5\text{–}0.8)Throughput≈Departures×2,000–4,000×(0.5–0.8) 

Baseline capacity is ~10,000–15,000 t/day, consistent with PB–27.

This framework converts vessel activity into real-time indicators of congestion, release, and system stability.