SUSPENDED AND BED LOAD SEDIMENT TRANSPORT THROUGH A COASTAL LAGOON ENTRANCE IN MAZATLAN, SINALOA, MÉXICO
A sediment transport study was carried out at the Urías Lagoon Entrance in Mazatlan, Sinaloa, Mexico. Tidal velocities and elevations were measured every two hours over two tidal cycles at the Lagoon Entrance. Simultaneously suspended sediment was sampled at the same location from two levels of the...
| Autores: | , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2012 |
| País: | México |
| Recursos: | UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO |
| Repositório: | Revista Internacional de Contaminación Ambiental |
| Idioma: | espanhol |
| OAI Identifier: | oai:ojs.pkp.sfu.ca:article/32539 |
| Acesso em linha: | https://www.revistascca.unam.mx/rica/index.php/rica/article/view/32539 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Sediment transport lagoon bed load Mexico |
| Resumo: | A sediment transport study was carried out at the Urías Lagoon Entrance in Mazatlan, Sinaloa, Mexico. Tidal velocities and elevations were measured every two hours over two tidal cycles at the Lagoon Entrance. Simultaneously suspended sediment was sampled at the same location from two levels of the water column. Phase differences (2-3 h) were found between maximum tidal velocities and maximum suspended sediment concentration. The axial distribution of sediment concentration near the water surface (1 m) in the lagoon was also investigated. Increasing sediment concentration values were found from the entrance (3.2 mg l-1) to the head (19.9 mg l-1) of the coastal lagoon. In addition, the field- work included measurements of waves, bed-forms and bed grain size parameters. Bed load and suspended sediment transport rates were computed at the lagoon entrance for critical tidal velocities by using a program developed by Van Rijn (1990). The largest suspended sediment transport (0.261 kg s-1 m-1) and the largest bed load transport rate (0.009 kg s-1 m-1) were found for ebb tide at cycle 2. The results also included instantaneous vertical profiles of sediment concentration, current velocities and sediment transport at the selected point. Most of the vertical profiles indicate a sediment concentration increase with depth through the water column. The suspended sediment flux increases from the upper water layers to the last 0.30 m layer near the bed where the increase is faster. |
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