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WAMSI 2 KSN 2.2.6 Terrestrial-Ocean linkages
This project represents the first attempt to characterize the interaction between largely undeveloped catchments and the coastal environment of the Kimberley and the role large coastal inlets play in transforming material transported from those catchments during large flows before it reaches the coast. This project has also attempted to provide the... more first assessment of how future changes in climate might impact these processes. Future climate scenarios suggest there is not a great difference in mean rainfall or flows between the three possible future climates and the Historical sequence. To investigate the physical-biogeochemical interactions in this region, a second model was established with a focus on the coastal margin and estuarine portion, and then additionally configured to simulate turbidity (including particle resuspension), and inorganic and organic carbon and nutrients. The model was validated and then used to assess how far terrestrial nutrients might extend from the river into Walcott Inlet and possibly Collier Bay. Flows greater than 300m3/s were shown to dominate nutrient loads within Walcott Inlet itself (>50% of total load) and significantly contribute to the inner reaches of Collier Bay (>15% of total load). less
Water Quality Engineering
Water Resources Engineering
26 Oct 2013
03 May 2014
Earth Science | Oceans | Coastal Processes | Inlets
Earth Science | Oceans | Coastal Processes | Sediment Transport
Earth Science | Oceans | Coastal Processes | Sedimentation
Earth Science | Solid Earth | Rocks/Minerals/Crystals | Elements | Radioactive Elements
Earth Science | Terrestrial Hydrosphere | Surface Water | Rivers/Streams
Earth Science | Terrestrial Hydrosphere | Water Quality/Water Chemistry | Chlorophyll
Earth Science | Terrestrial Hydrosphere | Water Quality/Water Chemistry | Inorganic Matter
Earth Science | Terrestrial Hydrosphere | Water Quality/Water Chemistry | Light Transmission
Earth Science | Terrestrial Hydrosphere | Water Quality/Water Chemistry | Nitrogen Compounds
Earth Science | Terrestrial Hydrosphere | Water Quality/Water Chemistry | Nutrients
Earth Science | Terrestrial Hydrosphere | Water Quality/Water Chemistry | Organic Matter
Earth Science | Terrestrial Hydrosphere | Water Quality/Water Chemistry | Stable Isotopes
Earth Science | Terrestria
Oceanographic and biogeochemical data was collected over two field campaigns to support development of the biogeochemical model. Chemical data to apportion sources of organic matter was also collected
No primary data collected in the hydrology component, but major data sets collated and new, simulation, data created:
1. Daily climate data from a range of stations, and catchment average series computed
2. Daily stream flow data, sporadic water quality data, future climate projections, stream flow and water quality.
Andrew T. Revil (CSIRO)
Nicole L. Jones (UWA)
Matthew R. Hipsey (UWA)
Louise C. Bruce (UWA)
Richard Silberstein (UWA)
Miles Furnas (AIMS)
Michael Donn (CSIRO)
Alexis Espinosa (UWA)
Renee Gruber (UWA)
Wencai Zhow (UWA)
CSIRO Data Licence
CSIRO (Australia), The University of Western Australia (Australia), Australian Institute of Marine Sciences (Australia), Western Australian Marine Science Institution (WAMSI) (Australia)
Revill, Andy; Jones, Nicole; hipsey, Matthew; Bruce, Louise; Silberstein, Richard; Furnas, Miles; Donn, Michael; Espinosa, Alexis; Gruber, Renee; Zhou, Wencai (2017): WAMSI 2 KSN 2.2.6 Terrestrial-Ocean linkages. v2. CSIRO. Data Collection.
All Rights (including copyright) CSIRO 2017.
The metadata and files (if any) are available to the public.
WAMSI - KIM 2.2.6 Terrestrial oce
The results from this project have provided the first insight to key questions around the role of terrestrial material entering the Kimberley coastal environment, however uncertainty remains in several aspects of the available observations and subsequent model predictions and these would require further refinement in order to answer key questions s... moreuch as the role this material might play in the coastal food web.
• The results in this report are based on only two field campaigns, one of which was restricted by vessel issues. To develop further understanding into the future it will be important to extend the temporal range of available observation data. One mechanism for this could be through knowledge transfer and training of traditional owner rangers based on country to facilitate on-going observation programs for parameters such as nutrient concentrations.
• Data from several Kimberley rivers suggests that dissolved organic nitrogen (DON) may be a significant nutrient input in high flow events. Presently little is known about the composition or availability of DON or whether it is associated with the first-flush or later in the flow event. It is important to understand more about this component and what role it may play in coastal productivity.
• Results from enhanced benthic mapping could be used to better configure spatial regions within the model domain with distinct sediment properties and/or benthic structures and communities.
• Improved focus on sediment resuspension and sedimentation will allow for improved prediction of suspended sediment and turbidity. Outputs from remote sensing efforts can be used to help calibrate such a model to better capture the turbidity gradient from the coast to offshore. Additional effort is required to better understand the rate of particulate carbon resuspension.
• Sediment nutrient fluxes, including denitrification estimates and nitrate/ammonium fluxes is important to better resolve the sediment derived nutrient loading to the water column. This includes recommendations for laboratory based sediment flux studies, and additional effort to apply/develop an improved sediment biogeochemical model.
• Water quality data from the streams flowing into the estuaries in the region are very limited. Only the Fitzroy River has anything approaching a reasonable dataset and that river does not flow into Walcott Inlet. It is strongly recommended that a concerted campaign of water sampling be undertaken, and that water sampling and analysis be introduced as part of the current stream gauging and monitoring programme. It would seem that given the resources required to maintain the current level of stream monitoring in the Kimberley, adding the cost of water sampling at each site visit or gauge attendance would be a minor additional expense that would yield enormous benefit for future understanding.
Several catchment modelling approaches were tested following methods used in the CSIRO Pilbara Water Resources Assessment project (CSIRO 2012). The method adopted was a modification of the methodology used in the Northern Australian Sustainable Yields (NASY) (CSIRO, 2009) project. This improved methodology (CSIRO 2012) uses a relatively simple catc... morehment runoff generation model based on the nine parameter SIMHYD model (Chiew and McMahon 2002, Chiew et al. 2002, Chiew and Siriwardena 2005, Tan et al. 2005). SIMHYD simulates catchment runoff using rainfall and potential evaporation (PE) with a daily time step. The model, now referred to as SIMHYDGW (Silberstein and Aryal 2015), has been modified to incorporate groundwater connections. The model, coded in Matlab (MathWorkstm), while simple, has enough hydrological detail and process representation to give a reasonable representation of catchment behaviour over large areas, and particularly as there are inadequate data to justify a detailed model application which could not be adequately calibrated. Stream flow generated with this model has four flow components: surface runoff, interflow, base flow and leakage to ground water representing water lost from the stream into riparian or deeper aquifers. The hydrological modelling simulates conditions up to the end of water year 2014. less
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