TRACEABILITY OF UNIDENTIFIED OIL SPILL USING WEBGIS ONLINE TOOLS

Abstract

The article presents the results of estimation of locations, time of oil spills back in time with model results indentifying the trajectory of backward-in-time oil spills, showing that the time of oil streaks meets the requirements for tracing support of unexplained oil origin on ESRI's WEBGIS platform and proposal of GIS optimization algorithm.

Based on the simulation algorithm of the Lagriange element propagation model, in which the optimization of the dynamic components to match on the WEBGIS environment, the article gives HYCOM 1/12° current field and GFS 1/2° wind field calibrated appropriate with the marine area of Vietnam. The results of comparing Sentinel-1 satellite images with the time-reverse trajactory model show that, the most suitable values are in the 7 days in the past (7 days forecast). The results having the time of oil streaks are in period of 22 hours on 9 May 2020 at coordinates 14.46° and 109.25° with an estimated oil streak length of about 13 km, vehicle size interpreted from Sentinel-1A image of 130 m x 280 m (width x length).

The process of determining the Backward-in-time oil spill trajectory is intergated with Remote Sensing - Geographic information system, dynamic model simulating the Backward-in-time oil spill trajactory integrated on WEBGIS for the response to investigation of the origin of the unexplained oil spill in the entire the marine area of Viet Nam.