Target Land Photos

TargetlandVIIe24

Severe gully erosion on argillite hill country in the Tapuaeroa Valley. Severe gully erosion on argillite hill country in the Tapuaeroa Valley. The eroding gully units generally have an associated watercourse, which as it cuts down destabilises the edges leading to slump, earthflow and gully edge collapse.
Gully erosion with associated earthflow (top end) and slumping (along the gully edges). Gully erosion with associated earthflow (top end) and slumping (along the gully edges). (This area would have been mapped as VIIe19 before the watercourse "cut down" causing the gully to become the prominent erosion form).

TargetlandVIIe21

Gully and slip erosion Gully and slip erosion
Severe erosion with some slump and slip characteristics Severe erosion with some slump and slip characteristics.
Severe large-scale slump caused by a two-fold effect. Severe large-scale slump caused by a two-fold effect. The watercourse has destabilised the hill slope toe; rainwater saturation of the hill slope has overloaded it and the slope has failed due to it's own shear weight. The only remedial option here would be to afforest this area to a practical boundary.
Numerous small gullies eroding into a larger watercourse. Also noticeable slip and slump erosion Numerous small gullies eroding into a larger watercourse. Also noticeable slip and slump erosion.
Severe gully erosion, almost all 'target land' planted in radiata pine. Severe gully erosion, almost all "target land" planted in radiata pine.
Gully erosion Gully erosion. The downcutting of the watercourse has destabilised the slope edges causing slip and slump damage.
Approximately half of this face is slump and slip erosion Approximately half of this face is slump and slip erosion, again cause by an eroding watercourse. The type of erosion could have been avoided with appropriately planted willow or poplar poles.
Severe slip and slump erosion Severe slip and slump erosion; the land has been destabilised by the eroding watercourse.
Gully erosion with scattered scrub, still 'target land' under the ECFP Gully erosion with scattered scrub, still "target land" under the ECFP.
Slump erosion caused by the eroding watercourse destabilising the toe of the hill Slump erosion caused by the eroding watercourse destabilising the toe of the hill.

Not Target Land

This type of erosion is common after heavy rainfall events. This type of erosion is common after heavy rainfall events. This type of erosion is common after heavy rainfall events. Although the erosion can be very severe it is also common in other regions of the country. Central Government funding cannot be justified for use on this type of erosion. The East Coast Forestry Project concentrates on the erosion types unique to the East Coast.

TargetlandVIIe23

Severe gully erosion with associated soil slip erosion on massive mudstone hill country. Severe gully erosion with associated soil slip erosion on massive mudstone hill country. This unit is characterised by very steep slopes slipping away into an almost gorge-like gully.

TargetlandVIIe19

Earthflow erosion. Note the characteristic broken, flowing appearance. It is covered in rushes Earthflow erosion. Note the characteristic broken, flowing appearance. It is covered in rushes
Large scale earthflow erosion; the majority of this photo would be mapped as 'target land'. Large scale earthflow erosion; the majority of this photo would be mapped as "target land".
Severe earthflow erosion. Severe earthflow erosion. It is recognised by the broken flowing appearance in the centre of the "Class VII" land. The surrounding land is more stable, has a smoother appearance and would be mapped as "Class VI" land.

Source:  photos courtesy of the Gisborne District Council, Soil Conservation Section, Conservation Quorum Spring 2000

 

Last Updated: 13 January 2011

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