Estudo da erosão costeira na ponte de acesso ao bairro de Ivagalane – Quelimane

Abstract

In the environment there is a continuous increase of the search ande valorization of space in the coastal zone, this also grows the concern about the erosive processes characteristic of this region. The major problem in coastal areas is that urbanization is a disorderly and unsustainable way, aggravating the problems arising from the study of coastal erosion. In order to perceive the problems arising in this region, determine the advance of coastal erosion from 2009 to 2018, and study the real causes of this process. A physical characterization of the area from satellite image of google earth was carried out during the work, observing the dynamics of erosion of 9 years, from 2009 to 2018. Interviews were carried out wuth the local community, a 24 hour oceanographic campaigh thus, tidal current, tide, suspended sediment concentration, sediment types and trajectories of currents in the flood and ebb tide ebb. This results show that for the margin of Sangariveira the greatest distance eroded was in the period 2011-2014 (4.8m) at a time when the margin was not eroded, the Ivagalane margin suffered the greatest erosion in the period 2017-2018 (3.9m) while the opposite margin eroded 1m. It is also noted in this result that erosion on the two banks is not directly related.