A structure knowledge-synthetic aperture radar interferometry integration method for high-precision deformation monitoring and risk identification of sea-crossing bridges

•Constructed the foreground-background scattering model for sea-crossing bridges.•Realized a 40% improvement of PTs number by a SAR coherent/incoherent combined method.•Improved the reliability of InSAR-based structural risk points of the two bridges.•Structural knowledge-InSAR integrated bridge mechanical property degradation analysis.•Analyzed the deformation characteristics and structural risk of the two bridges.