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Clydebank (Ck)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Clydebank- geoArea: 163 sq. km (0.8%,)

Plains formed by the exposure of lake floors, surround the Gippsland Lakes and are in Clydebank land system. Exposure of the old lake floors developed in various ways, including sea level change, tilting and a slight lowering of lake-level following breaching of the outer harrier at Lakes Entrance.

The plains are dominantly sandy and contain some low dunes, swamps and clay flats. Some of the swamps and flats are saline. The low areas may he temporarily inundated during high floods, greatly reducing flooding of other areas further downstream.
A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Clydebank- image
Remnants of woodland on sandy flats
The plains appear to have deep, acidic, sandy soils, with groundwater tables between one and two metres depth. The upper horizons have accumulated organic matter and have been leached. Soft, incipient humus- and iron-cemented horizons can be found in the subsoils, where they are probably forming above water table. The sands on the low dunes appear to be young and the accumulation of organic matter at the surface is the only soil development. On the silty and clayey plains, the soils have also accumulated considerable organic matter and show much subsoil or whole-profile mottling, indicative of poor drainage. Lime is sometimes evident in these subsoils and is probably derived from marine shells. The drier sands of the dunes are susceptible to wind erosion. Salinity hazard is high because of shallow groundwater and moderate to high, groundwater salinity. Prior to clearing, most of this country supported a grassy woodland I or ferny open woodland I, with a tussock grassland nearer the lake margins. Swamps, bordered by closed scrub, grow sedgeland and nearer the centre. herbfield.

CLIMATE
Rainfall, mean (mm)
Temperature, mean (C)
Seasonal growth limitations

    Annual 500 - 800); lowest July (30 - 50), highest October (50 - 80)

    Annual 12 - 14; lowest July (8 - 10), highest February (19 - 21)
    Temperature <10C (av.): No months
    Rainfall < potential evapotranspiration: November – March
GEOLOGY
Age, lithology

    Holocene lacustrine sand and some silts and clays
PHYSIOGRAPHY
Landscape
Elevation range (m)
Relative relief (m)
Drainage pattern
Drainage density (km/km2)

    Plains with low dunes, swamps and clay flats

    0 - 20
    0 - 5
    Deranged
    0
PRESENT LAND USE
    Mostly cleared: grazing; residential use.
    Minor proportion uncleared: recreation — fishing and shooting (swamps); areas in Gippsland Lakes Coastal Park and Blond Bay State Game Reserve

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Clydebank- csA study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Clydebank- graph

LAND COMPONENT
Percentage of land system
Diagnostic features
1
15
Low dunes
2
65
Flats with deep sandy soils, often
with high water tables
3
15
Flats with silty or clayey soils, sometimes brackish
4
5
Swamps in relict channels (too small to map as Morass land system)
PHYSIOGRAPHY
Slope %, typical and (range)
Slope shape
3 - 7, (0 - 15)
Convex
1, (0 - 2)
Straight
1, (0 - 2)
Straight
1, (0 - 1)
Concave to straight
SOIL
Parent material
Wind-sorted sand
Sands, often finer than in component 1
Lacustrine silt and clay
Description
Limited observations — black sand topsoil; brown sand subsoil becoming light yellowish brown at depth
Limited observations — black sand grading into grey sand over yellowish brown cemented sand
Black organic silty loam to light clay grading into strongly mottled brown to olive brown or grey clay subsoil; subsoil alkaline, sometimes calcareous
Soils as for Morass land system components 1.2 and 3
Classification
Siliceous Sands
Uc l.43
Incipient Podzols
Uc2.21
Wiesenboden, Humic Gleys
Gn3.43, Gn3.93, Um6.21. Uf6.33
Surface texture
Sand
Sand
Silty loam to clay
Surface consistence
Friable to firm when moist
Friable when moist
Slightly hard to very hard when dry
Depth (m)
>2.0
>2.0
>2.0
Nutrient status
Very low
Very low
Moderate
Available soil water capacity
Moderate
Moderate
Moderate to high
Perviousness to water
Rapid
Rapid
Slow
Drainage
Good
Poor to somewhat poor
Poor to somewhat poor
Exposed stone (%)
0
0
0
Sampled profile number
-
-
41
NATIVE VEGETATION
Structure of vegetation and characteristic species of dominant stratum
(+ Predominant species)
Mainly ferny open woodland I of
K. viminalis var. racemosa+ and
Pteridium esculentum with or without Banksia serrata
On dunes adjacent to lakes, grassy woodland I or open woodland I of E. tereticornis
Mainly grassy open woodland I of E. tereticornis or E. botryoides (in east) and/or Banksia integrifolia (usually near coast)
Some open woodland I of E. ovata and ferny open woodland I typical of component I.
Minor tussock grassland of Poa poiformis
Vegetation cleared — probably grassy open woodland I, II of
E. tereticornis
Vegetation as for Morass land system

Disturbance
Affected process and trend
Primary resultant deterioration
Casual activities
Primary off-site process
Form
Susceptibility of components
Incidence with components
    Alteration of vegetation:
    — reduction in leaf area, rooting depth and/or perenniality
    Reduced transpiration,
    resulting in:
    a) increased deep percolation and leaching



    b) rising, saline groundwater table


    Nutrient loss




    Salting


    1; high
    2; low



    2,3; moderate
    4; high


    Not determined




    Common; west of Lake Wellington


    Removal of trees




    Reduced water-use by plants within catchment


    Increased movement of water to groundwater; increased base-flow of streams


    Increased waterlogging/salting in lower areas

    Increased exposure of surface soil
    Increased wind velocity over soil and increased detachment of sand
    Wind erosion
    1; moderate
    2; low
    Uncommon; local occurrence on dunes
    Clearing, burning, road building and other earth-moving activities, trafficking by humans and vehicles.
    Encroachment by sand
    Increased physical pressure on soil
    Increased compaction

    With

    reduced infiltration
    Structure decline



    Sheet erosion
    1; low
    2,3,4; moderate - high


    3,4; low
    Uncommon; local occurrences


    Uncommon
    Increased trafficking cultivation, overgrazing, export of organic matter

    As for sheet and rill erosion above
    -



    Increased ponding of water in lower areas
    Increased soil disruption
    Increased loosening of sand
    Wind erosion
    1; moderate
    2; low
    Uncommon; local occurrence on dunes
    As for wind erosion above
    Encroachment by sand
    Comments: -
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