Scholarly record
THE IMPACT OF RIVER SEDIMENTATION ON THE VARIABILITY OF THE SEA FLOOR TOPOGRAPHY IS ONE OF THE FACTORS WITH A SIGNIFICANT IMPACT ON THE DYNAMICS OF THE COASTLINE
Abstract
In this study, we aim to demonstrate the change in the topography of the sea floor as a result of the sedimentation of rivers. The study area is the Divjaka Bay, bounded to the north by the delta of the Shkumbin River and to the south by the delta of the Seman River, on the Adriatic coast of Albania. The method used is the Integrated Satellite Bathymetric Surveying method. The monitoring period extends from 2017 to 2020, based on 4 monitoring campaigns. The longitudinal bathymetric profile extends northsouth, in proximity to the delta of the Shkumbin River in the north and the delta of the Seman River in the south, with a length of about 30km and a distance of about 70m from the coastline. The area is covered with 7 perpendicular bathymetric profiles (P1, P2, P3, P4, P5, P6, and P7), with an average distance of about 3000m between each other. The lengths of the profiles vary from 500m for the shortest profile to 3300m for the longest one. The information acquisition frequency is 1 point per 20m. The analysis of the obtained data is done by dividing the area into 3 sub-areas (northern, central, and southern). It is found that the speed of sea floor change is -104mm/year (erosion process) for the southern sub-area, +41.2mm/year (accumulation process) for the central sub-area, and -62mm/year (erosion process) for the northern sub-area. The overall vector of sea floor topography change in the study area results in a value of - 419mm/year. This conclusion confirms what can be visually observed in the area, where the two side zones are in the erosion process, while the central zone is in the accumulation process, which affects the dynamics of the coastline.
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