Estudo da dinâmica da linha da costa da praia Nova na cidade da Beira desde 2005 a 2016

Abstract

The present work deals with the dynamics of the coast line in Nova beach of the city of Beira. It is well known that along the Mozambican coast there are some regions that suffer erosion whereas in other places sedimentation is taking place. There are several causes related to these changes vary from place to place. The process that takes place in the Nova Beach is the erosion that this one creates numerous problems for the inhabitants, the municipality as well as the local government. In the possibility of assessing the dynamics of the coast line had to identify the points of retreat for this hears the need to download the image of Google earth pro. The factors influencing the coast line had to analyze the following parameters such as wave height, current, tide and also surveyed the topographic profile, sampled sediment was collected and beach goers were asked. Results indicate that in the period from 2005 to 2016 it eroded 64.33 m and an average erosion velocity of 5.84 m / year, wave, currents and tide actions are the main agents responsible for erosion of the zone and also these agents modify the profile topographic, the analysis of the slope of the beach indicates that it is a dissipative beach with predominance of fine sand, the auscultation obtained as the major cause of erosion the effect of the waves. Based on the analyzed parameters it is recommended to construct breakwater in the direction parallel to the coast and at a certain distance from the coast where it will help in the process of diffraction of the waves. It is concluded that due to the different magnitude of the coast line variation, it is being modified by the erosion that is influenced by the parameters such as waves, currents, tides that in turn with the sediment type and the topographic profile was proposed the best measure of erosion reduction.