Pingtan Straits Rail-cum-Road Bridge Monitoring

Challenge

The Pingtan Straits Rail-cum-Road Bridge is a cross-sea passage with a total length of 16.323 km, including an 11.15 km sea-crossing section. The upper deck is a two-way six-lane expressway (100 km/h design speed), while the lower deck is a double-track railway (200 km/h design speed). Monitoring such a complex dual-purpose structure in open sea conditions requires robust multi-method validation.

Solution

Deployed comprehensive InSAR monitoring combining SAR intensity mapping, deformation rate analysis, and thermal expansion coefficient measurement. Multiple InSAR processing methods were applied and cross-validated to ensure reliability of results in the challenging maritime environment.

Result

Multi-method comparison validated deformation results across the entire bridge. SAR intensity maps, deformation rate maps, and thermal expansion coefficient maps were generated. Time-series analysis at characteristic points confirmed the consistency of our InSAR techniques against alternative methods.

Scientific Results

Figure 1: Panel A: SAR intensity map. Panel B: Deformation rate map. Panel C: Thermal expansion coefficient map. Bottom: Multi-method time-series comparison at monitoring points P1 and P2, validating consistency across different InSAR processing techniques.

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Pingtan Straits Bridge InSAR Monitoring Study