Observation #12889 23-04-2019 | GMC: Gellibrand River Estuary Mouth Observation Site

Observation details

Overview

Estuary	Gellibrand River Estuary
Site	Gellibrand River Estuary Mouth Observation Site
Observation ID	#12889
Date and Time	Tuesday 23rd April 2019 09:00am
Approved	Approved

Notes

AHD G6 about 0.98 @ 08:40 AHD board still covered with silt

Observations made close to very low tide 0.1 @ 07:12

Very pale thin discharge out to sea & along to sand projection at mid beach. Out flow very shallow - channel about 20m wide .5 to .15 deep. at start of estuary. At mid channel it narrows to about 8m.then becomes more shallow & wider around rocks.Flow spreads very wide as waves enter at mouth. East side of channel has .20m sheer face as it approaches rocks.

Waves have been high up on beach at last hi tide. A large sand projection has formed at mid beach with area of beach behind scoured out. Strong longshore drift from east end travelling to spit where it meets incoming SW swell -large amount of sand visible in waves going out to sea. Only occasional longshore drift across mouth meeting small outflow & strong sw swell resulting in some waves going up the channel - large amount of sand visible in breakers around mouth. While sea is moderate there are higher wave sets are occurring

Mouth Observation

Mouth state	Open
Previous	O 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
Flow Present?	Yes
Previous	Y 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
Flow Direction	In
Previous	O 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

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

Physical Condition

	Current	Mode
Wind Direction	South-West
Beaufort Scale	Light Breeze
Sea State	Moderate

Water Levels and Tides

Water Level	Start	Finish
Height (m)	0.80m	0.77m
Time (hh:mm)	09:00	11:15
Tidal influence	Yes
Tidal Range	Time	Height
High	13:56	1.180
Low	07:12	0.100

Observation Documents

Link	Date	File name
Download	28-04-2019 07:10	Gp1_20190423_1_212_0031.JPG
Download	28-04-2019 07:10	Gp1_20190423_2_252_0032.JPG
Download	28-04-2019 07:10	Gp1_20190423_3_292__0033.JPG
Download	28-04-2019 07:10	Gp1_20190423_4_332_0034.JPG
Download	28-04-2019 07:10	Gp1_20190423_5_372_0035.JPG