Prior to the Phase 3 of the P2R Modelling Cycle ( refer to Table 6 ), any BBB monitored sub-basin load estimates were used in model validation only , not for model calibration . Model validation was limited to a small number of sites monitored as part of the State Government GBR Catchment Loads Monitoring Program ( GBRCLMP ). Although a useful first cut , these were limited in samples and years of coverage , therefore adding considerable uncertainty given the range of discharge conditions the catchment encounters . In addition , other downstream and tributary water quality data was located however as yet undeveloped techniques were required to extract useful information about BBB Loads . Mainly these data were limited in samples , ungauged or where well downstream of source . Importantly , the period after the Phase 3 model rebuilds coincided with the initiation of the LDC project and provided an opportune moment to analyse the increasing GBRCLMP dataset and assimilated LDC community WQ monitoring ( tributaryscale ), and associated NESP sediment tracing . This would thereby , likely improve the catchment modelling and the conceptual understanding of water quality loads and process in the BBB .
Table 6 . Summary of Paddock to Reef Program Source Catchment modelling cycle .
Phase 1 Modelling 2009 – 2013
Management Practice data baseline year ; climate period
Report Card 2009 |
Kroon et al . ( 2010 ) model results |
2009 ; |
Report Card 2010 |
Model build ; hydrology calibration ; |
1986-2009 |
Report Card 2011 Report Card 2012 Report Card 2013
Minor model changes Minor model changes Minor model changes
Phase 2 Modelling 2014 – 2018
Report Card 2014 Major model changes ; update Source platform ; hydrology recalibration ; incorporate new management practice framework ; climate period for reporting extended
Report Card 2015
Report Card 2016 Report Card 2017
Report Card 2017 / 2018
Report Card 2019
Report Card 2020
Report Card 2021
Minor model changes ; hydrology calibration modified for better alignment of baseflow in some regions
Minor model changes
Carried over to allow for baseline management data reset ; research major changes for next rebuild .
Phase 3 Modelling 2018 – 2022
Major model changes ; incorporate updated management practice baseline data ; spatial approach to parameterisation for streambanks , gullies , and hillslopes ; updated input datasets ( e . g . land use , gully density ); reporting against water quality targets at basin scale
Minor model changes ; land use updated in two regions ; updated gully density inputs ;
Minor model changes – release held over Phase 4 Modelling 2022 - ?
Major model rebuild incorporating LDC water quality data ( samples and Tracing ) plus limited LIDAR
Management Practice data baseline year ; climate period
2013 ; 1986-2014
Management Practice data baseline year ; climate period
2016 ; 1986-2014
Management Practice data baseline year ; climate period
?
122