Estudo da dinâmica da erosão dos solos em Mugogoda, posto administrativo de Maquival, distrito de Quelimane

Abstract

In the environment, there is a continuous increase of searching and valorizing coastal zones, at the same time there is a concern about the erosive processes characteristic of this region. The biggest problem in the coastal zones is that the urbanization is done in a disorderly and unsustainable way, aggravating the problems caused by the coastal dynamic. Mugogoda is the study area and is located to the east with Zalala beach with a distance of 7 miles, at west with Quelimane city with a distance of 33 miles and north of the district of Macuse at coordinates 17 ° 47'42.79 " south of latitude and 37 ° 04'39.55 "east of longitude. In order to understand the problems that occur in this region, the work focused in dynamism of erosion study, learn about the main causes of this erosion and propose mitigation measures are the objectives. A physical characterization of the area through Google Earth satellite imagery was performed during the study to observe a dynamic period of erosion over a period of 13 years from 2003 to 2016. The local community was interviewed and was done an oceanographic campaign in a 24-hour period having thus obtained tidal current data, tides, suspended sediment concentration, sediment type and direction of currents in the flood and ebb tide. The results reveal that between the periods from 2011 to 2015 about 14.91 meters was eroded, an average of 3.31m / s. It should be noted that in this region as semi-diurnal tides, composed of two floods and two empties reaching high heights of up to 4 meters, as currents with greater influence for erosion in this area under study are like currents of the north arriving these at the speed of 105 cm / s, with higher velocities occurring during the ebb. In this way, if there is no intervention in 5 years and 2 months, this process of erosion can present an advancement of 28.8 meters.