GNSS-IR用于近海岸绝对海平面变化监测研究OA

This study proposed a novel monitoring scheme that integrates GNSS interferometric reflec-tometry(GNSS-IR)with GNSS positioning for monitoring coastal absolute sea level changes.Using over 10 years of observational data from seven coastal stations in Hong Kong as an example,research on absolute sea level change monitoring in nearshore areas was conducted.The results indicated that after excluding the stations HKSL and KYC1,which had lower data quality,the GNSS-IR-derived relative sea level changes from the remaining stations showed good agreement with tide gauge data in their monthly averages.For most stations,the RMSE was less than 6 cm,the correlation coefficient was greater than 0.86,and the difference in estimated sea level rise trends was less than 1 mm/a com-pared to tide gauges(with a regional average difference of only 0.036 mm/a).In absolute sea level monitoring,after applying the dynamic atmospheric correction(DAC),the difference in regional av-erage rates between coastal GNSS and satellite altimetry at corresponding points was reduced from-3.40 mm/a to-0.76 mm/a,indicating highly consistent trends.Compared with 50-year long-term absolute sea level data from Hong Kong tide gauges,the deviations were mostly less than 1 mm/a,and all stations fell within reasonable error margins for regional absolute sea level monitoring.The re-search demonstrates that the fusion of GNSS-IR and GNSS positioning can effectively address tradi-tional monitoring gaps,providing a scalable new technical approach for monitoring coastal sea level changes and conducting risk assessments.