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Source Catchments Reef Catchments

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Source Catchments Reef Catchments Powered By Docstoc
					    Source Catchments
     Reef Catchments
Chris Carroll, David Waters, Ross Searle, Rob Ellis,
Louise Hateley, Gillian McCloskey, Cameron Dougall,
          Bantie Fentie, Helle Vittinghus,
Purpose for Source Catchments
•   To assess and report on progress towards meeting Reef Water
    Quality targets
Reef WQ Targets
By 2013, at the end of catchment there will be a minimum:
•   50% Reduction in Nitrogen & Phosphorus
•   50% Reduction in pesticides, and
•   50% late dry season groundcover on dry tropical grazing land


By 2020, at the end of catchment there will be a minimum
•   20% reduction in sediment loads
Approach
To assess the progress, 4 lines of evidence are used to determine:


1. Effectiveness of land management practices
2. Prevalence of improved land management practices
3. Improvements in water quality using catchment monitoring
4. Improvements in water quality using catchment modelling
   Source Catchments is the modelling tool used.
4 Lines of Evidence
1. Practice        2. Prevalence of     3. Water Quality          4. Water Quality
Effectiveness      Practices            Reductions                Outcomes
                                        (Long-term monitoring)    (Catchment modelling)


Simulations                                                       Source Catchments

                             Land
                             Use                    Sub-
                                                    basin
                                                          Basin
         Plot


                             Bare
                             Ground
         Paddock             Index
                                                                                 Marine
                             Riparian
            Land Uses
                        Cane


Bananas




 Grazing



                               Horticulture
 Cropping
Project Deliverables
•       Calibrated Source Catchment models for
        35 priority catchments.
•       SedNet/ANNEX functionality
        incorporated.
•       Modelled load estimates for:

    •    Natural

    •    Baseline( 2008)

    •    Impact of changes in management practices on
    WQ (post Reef Plan 2009 )
                                          Annual Reef Report
                                                                                                              80% of landholders
                                                                                                                  (sugarcane,
                                                    Achieve a minimum                                          horticulture, dairy,
                         50% reduction in           of 50% dry season                 20% reduction in        cotton and grains)
                        the total pesticide         groundcover in the                sediment load at        adopted improved
 TARGETS                load at the end of          Dry Tropics grazing                  the end of             soil, nutrient and
  (Examples)              catchments by                    lands                       catchments by          chemical practices
                               2013.                                                       2020.                    (cropping)




                                                                Modeled
                                                             WQ Outcomes
                                              BGI           (a synthesis tool)
                                                                                                     Calibration: Verification
Lines of
Evidence
                                                                                                            WQ Reductions
                 Practice                                     Prevalence of
                                                                                                          Catchment Monitoring
               Effectiveness                                Improved Practice
                                                                                                               (long term)



Paddock          Paddock             Rainfall           Cane               Grazing           Cropping
Monitoring       Modelling          Simulation        (A,B,C,D)           (A,B,C,D)          (A,B,C,D)
          Linking
Paddock-Catchment Modelling
           Mark Silburn, Steve Attard,
   Tessa Chamberlain, Mel Shaw, Brett Robinson
Source Catchments   Forecast and manage
                    stream water
                    quantity, quality & the
                    effects of catchments
                    on streams
Conceptual Approach
                 Functional Units - Land Use

                 •   Agreed on a standard set of 8 Land Use
                     groupings with an additional 2-3 local
                     categories

                 Constituents

                 •   TSS, TP, TN, 5 Pesticides. (Speciated
                     nutrients through Annex)

                 Paddock scale modelling

                 •   Coupled to Source Catchments to
                     represent temporal variability
Point models run for every combination of
climate, soil and management practice


Howleaky – Cropping: Sediment, pesticide, phosphorus.
APSIM – Cane: Nitrogen, cane cover & production.           Rainfall       Transpiration

GRASP – Grazing: Sediment, pasture cover & production.
                                                                                       Plant
                                                         Evaporation                  growth


                                              Runoff
                                          Sediment
                                          Pesticides     Soil water 
                                         Phosphorus        store

                                                                       Drainage
Three example sub-catchments
            Lots of time series (+ prevalence info)
            handed over to be processed by
            Accumulator tool
    A mgt – 10%
Date, Erosion, Pesticide
01/01/1976, 0, 0               B mgt – 50%
02/01/1976, 0, 0
03/01/1976, 0, 0           Date, Erosion, Pesticide
04/01/1976, 0, 0
05/01/1976, 0, 0
                           01/01/1976, 0, 0
                           02/01/1976, 0, 0
                                                          C mgt – 40%
06/01/1976, 0, 0           03/01/1976, 0, 0           Date, Erosion, Pesticide
07/01/1976, 0, 0           04/01/1976, 0, 0           01/01/1976, 0, 0
08/01/1976, 0, 0           05/01/1976, 0, 0           02/01/1976, 0, 0
09/01/1976, 0, 0           06/01/1976, 0, 0           03/01/1976, 0, 0
10/01/1976, 0, 0           07/01/1976, 0, 0           04/01/1976, 0, 0
11/01/1976, 0, 0           08/01/1976, 0, 0           05/01/1976, 0, 0
12/01/1976, 0, 0           09/01/1976, 0, 0           06/01/1976, 0, 0
13/01/1976, 1.63, 0.4      10/01/1976, 0, 0           07/01/1976, 0, 0
14/01/1976, 0.51, 0.2      11/01/1976, 0, 0           08/01/1976, 0, 0
15/01/1976, 0, 0           12/01/1976, 0, 0           09/01/1976, 0, 0
16/01/1976, 0, 0           13/01/1976, 1.74, 0.4      10/01/1976, 0, 0
17/01/1976, 0, 0           14/01/1976, 0.34, 0.1      11/01/1976, 0, 0
18/01/1976, 0, 0           15/01/1976, 0, 0           12/01/1976, 0, 0
19/01/1976, 0, 0           16/01/1976, 0, 0           13/01/1976, 5.23, 0.8
20/01/1976, 0, 0           17/01/1976, 0, 0           14/01/1976, 1.66, 0.4
21/01/1976, 0, 0           18/01/1976, 0, 0           15/01/1976, 0, 0
22/01/1976, 0, 0           19/01/1976, 0, 0           16/01/1976, 0, 0
23/01/1976, 0, 0           20/01/1976, 0, 0           17/01/1976, 0, 0
24/01/1976, 0, 0           21/01/1976, 0, 0           18/01/1976, 0, 0
25/01/1976, 0, 0           22/01/1976, 0, 0           19/01/1976, 0, 0
26/01/1976, 0, 0           23/01/1976, 0, 0           20/01/1976, 0, 0
…                          24/01/1976, 0, 0           21/01/1976, 0, 0
                           25/01/1976, 0, 0           22/01/1976, 0, 0
                           26/01/1976, 0, 0           23/01/1976, 0, 0
                           …                          24/01/1976, 0, 0
                                                      25/01/1976, 0, 0
                                                      26/01/1976, 0, 0
                                                      …
Results fed into cropping FU in
each sub-catchment – FU point
model parameteriser




                                  This approach has been piloted
                                  in the Fitzroy
                            Example: Reef Report Card
                                    Total N, Total P
   Current   Anthropengic                   5% Reduction



Target 50%

   Natural




                             2009              2011
Why is it important?
   Evaluate:
   • Progress towards meeting WQ targets.
   • Relative effectiveness of management
     practices.
   • Prioritisation of management practices.
   • Effectiveness & Adequacy of on-
     ground funding.
Summary
•   Reef is an opportunity to become flagship for Source Catchments
•   Real world application.
•   National and International significance.

				
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