FIELD OBSERVATION ON SUSPENDED-LOAD IN THE SURF ZONE

Kazumasa Katoh, Norio Tanaka, Isao Irie

Abstract


Both the concentration of suspended-load and the
current velocity have been measured continuously in
the surf zone. In order to measure the concentration
of the suspended-load in the surf zone, a optical
densitometer has been developed. The current
velocity was measured by means of electromagnetic
current meters. According to data analyses, the
mean concentration of the suspended-load is high in
the final breaking zone and in the breaker zone. In
the final breaking zone, the concentration
fluctuates with the period of the incident waves.
On the other hand, it fluctuates with the period
longer than 40 seconds in the breaker zone and it
becomes high when the current is offshoreward. The
directions of the net transport of the suspendedload
in the middle layer in and near the surf zone
are offshoreward.

Keywords


surf zone; suspended sediment; field observation

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