Porirua Harbour Seminar Series - Pres 3 - GWRC Presentation on Harbour Health
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Transcript of Porirua Harbour Seminar Series - Pres 3 - GWRC Presentation on Harbour Health
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7/29/2019 Porirua Harbour Seminar Series - Pres 3 - GWRC Presentation on Harbour Health
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Porirua Harbour
A sensitive receiving environmentA sensitive receiving environment
Juliet Milne, 21 October 2009
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Outline The harbour is an
estuary Common estuary
issues Monitoring results
Management issues
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Porirua Estuary The harbour is an actually
an estuary Estuaries are sensitive to
a number of issues:
habitat loss
sedimentation
eutrophication (enrichment)contamination
Monitoring & management need to
target these issues
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Sedimentation monitoring site
Recreation monitoring site
Intertidal monitoring site
Subtidal monitoring site
Stream monitoring site
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Habitat loss Broad-scale mapping
of intertidal substrate& vegetation
% cover of mud,
saltmarsh, seagrass,vegetated terrestrialbuffer, nuisance algae
December 2007base-line (5-yearly mapping)
Rushland, Pauatahanui arm
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2007 survey results
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Invasive species
Invasive kelp (Undaria pinnatifida)
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Invasive species
Plastica fizzii
Roadus tyrus
Shoppin trolleri
Roadus conerii
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Sedimentation Sedimentation plates installed in 2007/08
Depth to plates measured annually
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Eutrophication Annual monitoring at 4 intertidal sites
fine-scale sediment condition indicators
benthic (sediment-dwelling) fauna
Annual mapping of macroalgal cover
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Measuring the depth of
oxygenated sediment
Healthy
Anoxic
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Macroalgae cover
Sea lettuce (Ulva)
Eel grass (Zostera)
January 2009 morethan 50% coverageof nuisance algae in
some areas
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Identification of benthic fauna
Cockle
Wedgeshell
Mudflat whelk
Capitella capitata
Polychaete worms
Benthic faunaphotos: Cawthron
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Contaminants Part I
Disease risk
Water quality
tested at 6recreational sitesweekly duringsummer
Not always safe
for swimming
avoid after rain
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1
10
100
1,000
10,000
Jul-2007 Dec-2007 Jun-2008 Dec-2008 Jun-2009
En
terococci(cfu/100mL)
Action guideline
Alert guideline
Paremata Bridge, 2007-2009
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Porirua Harbour rowing club, 2001-2009
1
10
100
1,000
10,000
Nov-2001 Nov-2002 Nov-2003 Nov-2004 Nov-2005 Nov-2006 Nov-2007 Nov-2008 Nov-2009
Ente
rococci(cfu/100
mL)
Action guideline
Alert guideline
unsafe
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Contaminants Part I cont.
Disease risk
Shellfish flesh
(cockles) testedperiodically
Lack of guidelinesfor manycontaminants
Avoid streams &stormwater
outfalls
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Contaminants Part II
Toxicants
Five subtidal
monitoring sitessampled in 2004,2005 & 2008
Lead, zinc & DDTmain contaminants of concern
elevated, persistent & toxic
No clear evidence of significant
ecological effects
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Total zinc concentrations
ANZECC ISQG-low
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Total DDT concentrations (at 1% TOC)
PAH1 PAH2 PAH3 POR1 POR2
Site
0
1
2
3
4
5
6
7
8
9
10
DDT
(ng/g@
1
%TOC
)
ANZECC ISQG-Low = 1.6 ng/g
ARC ERC:red = 3.9 ng/g
ANZECC ISQG-low
ARC ERC red
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Toxicants-intertidal hotspot study Targeted stream outflows,
and stormwater outfalls
southern end of harbourstreambed sediments
Clear evidence ofstormwater-derivedcontamination
Zinc, lead, PAHs, DDTabove guidelines insurface sediments
Semple St outfall
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Management issues
Sensitive receivingenvironment in an
urban setting
Sediment & nutrient
inputs control atsource
Transport ofcontaminants
stormwater-derived
inputs are ongoing
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Management issues
Existing contamination
Future development?
Whole of catchment
approach needed
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Everyonehas a role to play