Coastal topo-bathymetric MNT of the Gironde estuary – Upstream (HOMONIM project)

The update of the coastal topo-bathymetric NTM of the Gironde estuary – upstream to a resolution of 0.0002° (~ 20 m) was carried out as part of the HOMONIM phase 3 project. This MNT extends over the upstream part of the Gironde estuary, from Pauillac to Bordeaux on the Garonne and to Libourne on the Dordogne. It is complementary to the MNT covering the downstream estuary (between Pauillac and the mouth of the Gironde). The NTM is intended to be implemented in hydrodynamic models to produce as accurate forecasts as possible of the heights of water and sea states to the coast in order to improve the relevance of the Vigilance Vagues-Submersion. This product is available with the lowest astronomical sea level (PBMA) or mean sea level (NM) as a vertical reference.吉伦特河口海岸地形测深数值地形模型（NTM）的上游区域更新工作作为HOMONIM第三阶段项目的一部分完成，该区域的空间分辨率达0.0002°（约20米）。 此数字地形模型（MNT）覆盖吉伦特河口上游区域，范围涵盖加龙河上的波亚克至波尔多段，以及多尔多涅河上的利布尔讷段。该模型可作为覆盖下游河口（波亚克至吉伦特河口）的数字地形模型的补充产品。 该NTM旨在应用于水动力模型，以实现海岸带水位与海况的高精度预报，进而提升海浪与淹没警戒系统的预警有效性。 该产品可采用最低天文海平面（PBMA）或平均海平面（NM）作为垂直基准面。