Observation #12891 26-04-2019 | GMC: Gellibrand River Estuary Mouth Observation Site

Observation details

Overview

Estuary	Gellibrand River Estuary
Site	Gellibrand River Estuary Mouth Observation Site
Observation ID	#12891
Date and Time	Friday 26th April 2019 14:14pm
Approved	Approved

Notes

AHD @ G6 about 0.96 @ 13:58 board covered with silt

Observations made during hi tide & storm surge - wind from SE 8-9 along beach but even stronger turning down channel Not possible to use Gp1 site so taken from below.

Waves entering from high sea combined with a very high tide. No fresh discharge only shallow salt return over high sand build up in channel. Waves going up to base of dunes all along beach & channel. Entering very wide at mouth & completely across channel. SW swell with over 8m waves strongly impacting east end of beach creating very strong longshore drift & backwash. Waves overtopping high part of beach about 50m from west cliff then turning west & around into the channel meeting incoming waves from SW swell also going down creating an extremely strong N-S backwash - also whirlpools at start of estuary, this action has left significant depressions in the sand . The wind action has also sent large amounts of sand from the beach down the channel & into the estuary

Mouth Observation

Mouth state	Open
Previous	O C O O O O O O O O O O O O O O O O O O O O O C O O O O C O O O O O O C C C C C C C C O O O C C C C C O P C C C O O O O O O O O
Flow Present?	Yes
Previous	Y N Y Y Y Y Y Y Y Y Y Y Y N Y Y Y Y Y Y Y Y Y N Y Y Y Y N Y Y Y Y Y Y N N N N N N N N Y Y Y N N N N N Y N N N N Y Y Y Y Y Y Y Y
Flow Direction	In
Previous	O N O I O O O I O O I O O N O I O O O O O O O N O O O O N O O O O O I N N N N N N N N O O O N N N N N I N N N N O O O O I O I I

	Above Sea	Above Estuary
Berm Height (m)
Berm Length (m)

Physical Condition

	Current	Mode
Wind Direction	South-East
Beaufort Scale	Gale, fresh gale
Sea State	High

Water Levels and Tides

Water Level	Start	Finish
Height (m)	1.00m	1.22m
Time (hh:mm)	14:14	16:20
Tidal influence	Yes
Tidal Range	Time	Height
High	15:40	1.100
Low	08:39	0.090

Observation Documents

Link	Date	File name
Download	28-04-2019 12:00	Ge_20190426_wave_entering_with_longshore_drift_0261.JPG
Download	28-04-2019 12:00	Ge_20190426_waves_at_entrance_0249.JPG
Download	28-04-2019 12:00	Ge_20190426_wave_entering_with_longshore_drift_2_0262.JPG
Download	28-04-2019 12:00	Ge_20190426_channel_backwash_2_0267.JPG
Download	28-04-2019 12:00	Ge_20190426_sand_formation_1_0281.JPG
Download	28-04-2019 12:00	Ge_20190426_wave_wind_blown_sand_down_channel_0235.JPG