Analysis of the behavior of the seafloor of the mouth of the Grijalva river, Tabasco in the years 2012, 2017 and 2021

Bathymetric surfaces created from bathymetric data obtained by Hydrographic Survey Brigades allow the representation of the relief of the seabed of a specific area and thus perform the analysis of its behavior. Therefore, the main objective is to characterize the seabed of the mouth of the Grijalva Tabasco River, by means of the difference surfaces and the TIN Model, and thus make a comparison between them, defining their variability as a result of sedimentation. The bathymetries of the hydrographic surveys that were considered for the study were those carried out in 2012 with the R2Sonic multi-beam echosounder, in 2021 with the Hydrotrac II ODOM single-beam echosounder and in 2021 with the Geoswathplus Compact multibeam echosounder, processing the data obtained with the hydrographic programs Caris Base Editor 5.5 and Hypack Software version 17.0 2021, obtaining the bathymetric surfaces of each year mentioned. The results obtained are that there are areas in the lateral parts of the mouth with a higher concentration of sediment, forming a coastal bar 2,500 m long by 612 m wide that reduces the depth to 1.8 m. In addition, it was determined that the period of greatest presence of rain and drag of material was the month of May to November. The above allows the implementation of actions to guarantee the safety of navigation of those larger vessels that sail towards the port of Frontera Tabasco