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Actividad actual de turbidez en un fiordo de la Columbia Británica

D B Prior, B D Bornhold, W J Wiseman

Science (New York, N.Y.)

|September 11, 1987

Resumen

Se detectaron corrientes de turbidez activas en Bute Inlet, Columbia Británica, que transportaban arena gruesa a altas velocidades y alturas significativas sobre el fondo marino a largas distancias.

Área de la Ciencia:

Geología marina Geología marina.
Oceanografía La oceanografía es la oceanografía.
El transporte de sedimentos es

Sus antecedentes:

Las corrientes de turbidez son cruciales para la redistribución de sedimentos en entornos marinos.
Comprender su dinámica es clave para interpretar los registros geológicos y evaluar los riesgos geológicos.

Objetivo del estudio:

Para monitorear y caracterizar las corrientes de turbidez activas en un sistema alargado de canal-abanico.
Para cuantificar las velocidades de flujo, las capacidades de transporte de sedimentos y la extensión del flujo.

Principales métodos:

Programa de monitoreo in situ durante todo el año.
Medición de las velocidades del fondo y recolección de sedimentos utilizando trampas.
Análisis de la evidencia física, como el amarre y los daños en el equipo.

Principales resultados:

Detección de frecuentes turbidez energética eventos actuales.
Las velocidades máximas alcanzaron los 335 cm/s con espesores de flujo superiores a los 30 metros.
La arena gruesa transportada hasta 7,5 metros por encima del fondo marino.
Los flujos se extendieron 25.9 km, potencialmente hasta 50 km, sobre pendientes suaves (<1 °).

Conclusiones:

Confirma corrientes de turbidez activas y de alta energía en el sistema de ventiladores de canal de Bute Inlet.
Demuestra la capacidad de estas corrientes para transportar sedimentos gruesos a largas distancias.
Destaca la importancia de la observación directa para la comprensión de los procesos de transporte de sedimentos de aguas profundas.

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