WfHC - cover page (not to be used with pre-printed report ... - CSIRO

Figure 68. 2004 Aerial Photograph of Oriners Station and Lagoon, showing existing road
infrastructure and gully erosion problem areas. ........................................................ 162
Figure 69. Ground photos during July 2011 of a) a sand bar infilling the top end of Oriners
Lagoon, b) the same sand bar at distance with colonizing vegetation, c), bank erosion
and adjacent sand bar along the main anabranch channel above Oriners Lagoon, d)
similar anabranch bank erosion and sand splay onto the floodplain above Oriners
Lagoon, e) general sheet and gully erosion along the road crossing the upper
anabranch inlet to Oriners Lagoon, and f) the same eroded anabranch channel looking
upstream from the road. ............................................................................................ 163
Figure 70. Ground photos of the Oriners Lagoon outlet a) in 1997 looking north with active
road across outlet and sparse woodlands and emergent Melaleuca trees on sill, b) in
July 2011 looking south with denser stands of Melaleuca trees, c) in July 2011 looking
upstream at eroded cut through the sill on the southern outlet, d) in July 2011 looking
upstream at the southern outlet channel eroding upstream toward the sill and cut, e) in
~1990 looking upstream at the sill on the northern outlet, and f) in July 2011 looking
upstream at an incipient cut that will eventually erode through the sill on the northern
outlet; note same tire hanging from tree in e and f. ................................................... 164
Figure 71. Examples of alluvial gullies on lagoon banks at a) Oriners Lagoon, b) Jewfish
Lagoon, c) road/track at Jewfish Lagoons feeding water into a gully, which is the same
as d) next to Jewfish Lagoon. ................................................................................... 168
Figure 72. A large gully upstream of Oriners Lagoon triggered by the road crossing the
lagoons inlet drainage ways. ..................................................................................... 168
Figure 73. Examples of roads/tracks that have cut into the Eight Mile floodplain creating
linear alluvial gullies: a) the western road entrance to Oriners, b) the eastern entrance
to Oriners, c) an intact road segment on the eastern road, d) a gullied road segment
downstream of c on the eastern road, e) the gullied airplane strip at Oriners from the
ground, and f) the gullied airplane strip and adjacent road/fenceline at Oriners from the
air. ............................................................................................................................ 169
Figure 74. Examples of potential impacts from new road construction through Oriners Station
and bypassing the Oriners homestead: a) the new cleared bypass viewed from the air,
b) the new cleared bypass crossing an intact swampy drainage way (dambo) viewed
from the air, c) the same intact swampy drainage way (dambo) viewed from the
ground, d) a similar nearby drainage way that has been gullied from excess road
runoff, e) the new bypass road clearing and initial gully erosion by subsequent wet
seasons, and f) a new constructed road prism with continued delivery of road ditch
sediment and concentrated water to a local creek, in addition to the spread of grader
grass and other weeds.............................................................................................. 170
Figure 75. Annual fire frequency of all seasonal fires for the Oriners/Sefton area between
1997 and 2010. Dark red to purple area represent frequent fires occurring 10 year out
of 14 total. Data are from the Northern Australia Fire Information (NAFI) website
(www.firenorth.org.au). ............................................................................................. 175
Figure 76. Annual fire frequency of late-season fires for the Oriners/Sefton area between
1997 and 2010. Dark red to purple area represent frequent late-season fires occurring
10 year out of 14 total, with a similar pattern and frequency to all fires in Figure 75.
Data are from the Northern Australia Fire Information (NAFI) website
(www.firenorth.org.au). ............................................................................................. 175
Figure 77. 1955 aerial photograph of the Eight Mile Creek floodplain and grassy woodlands
1000m south of the Oriners Station Air Strip. Compare to Figure 78. ........................ 176
Figure 78. 2004 air photograph of the Eight Mile Creek floodplain and grassy woodlands
1000m south of the Oriners Station Airstrip. Note woodland thickening around
Working Knowledge at Oriners Station, Cape York
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