Hydrodynamic Sediment Environment and Port Development Research in the Sea Area for Matakong Island, Guinea

Abstract

Based on the observed data, hydrodynamic sediment environment and port development in the Matakong sea area are researched. The results show: (1) the local tide belongs to regular semi-diurnal tide. The mean tide range is 2.42m. The mean current velocity is from 0.11m/s to 0.39m/s, and the max vertical mean current speed is from 0.18m/s to 0.60m/s. The prevailing direction is mainly from W to SW, the mean wave height is less than 1.0m, the maximum wave height is 1.5m around, and the mean period is from 4.6s to 4.7s. (2) Medium grain sizes of seabed sediment samples are from 0.0038mm to 3.0597mm in the dry season and from 0.0075mm to 1.1044mm in the rainy season. (3) Average suspended sediment concentration is 0.02-0.09 kg/m3, and the max sediment concentration presents 0.3kg/m3 approximately. (4) Most parts of the sea area are equilibrium in sixty years, and the erosion and deposited ranges are 3.0cm/a about. (5) After the ore wharf development, deposited sediment is mainly mud. The annual mean deposited strength of the channel is from 0.14m/a to 0.84m/a, and the annual mean deposited strength in the harbor basin is 0.42m/a.