Development of a Groundwater Model for the Western Davenport Plains
Knapton, Anthony; CloudGMS Pty Ltd
Northern Territory. Department of Environment, Parks and Water Security
E-Publications; E-Books; PublicationNT; WRD Technical Report 27/2017
2018-03
Western Davenport Water Control District
CloudGMS has been commissioned by DENR to develop a numerical groundwater model of the aquifers within the central area of the WDWCD to improve confidence in the sustainability of the groundwater resources, as this is the area within the WCD with greatest potential for intensive development.
Made available by via Publications (Legal Deposit) Act 2004 (NT); Prepared for Dept Environment and Natural resources
Executive summary -- 1 Background -- 2 Physical -- 3 Available data -- 4 Conceptual model -- 5 Model design & construction -- 6 Parameter estimation -- 7 Water balances -- 8 Sensitivity analysis -- 9 Predictive scenarios -- 10 Conclusions -- 11 Reference -- 12 Document history and version control -- Appendix A - Groundwater level hydrographs - Appendix B - Alek range horticultural farm sub-regional modelling
English
Groundwater; Northern Territory; Western Davenport Water Control District; Conceptual mode
Northern Territory Governmnet
Palmerston
version 2.0
WRD Technical Report 27/2017
ix, 127 pages : colour illustration and maps ; 30 cm
application/pdf
9781743502976
Attribution International 4.0 (CC BY 4.0)
Northern Territory Government
https://creativecommons.org/licenses/by/4.0/
https://hdl.handle.net/10070/842058 [LANT E-Publications: Development of a Groundwater Model for the Western Davenport Plains, version 1.1]
https://hdl.handle.net/10070/858845
https://hdl.handle.net/10070/858846
Western Davenport WCD Groundwater Model (v2.0) Contents CloudGMS iv 3.8.1. Pump test derived hydraulic properties ......................................................................... 36 3.8.2. Aquifer parameters from long term pumping near Alekerange Horticultural Farm .......... 39 3.9. Groundwater extraction .................................................................................................... 40 3.10. Hydrologic data ................................................................................................................ 41 3.11. Vegetation mapping ......................................................................................................... 42 3.11.1. Regional vegetation mapping ................................................................................... 42 3.11.2. Wetland mapping ..................................................................................................... 42 3.11.3. Leaf Area Index (LAI) ................................................................................................. 43 3.11.4. Vegetation root depth ............................................................................................... 46 3.11.5. Mapped groundwater dependent vegetation mapping .............................................. 46 4 Conceptual model ..................................................................................................................... 48 4.1. Introduction ...................................................................................................................... 48 4.2. Proposed conceptual model ............................................................................................ 48 4.3. Groundwater recharge ..................................................................................................... 50 4.3.1. Overland flow and inundation during flood events ......................................................... 51 4.4. Groundwater flow ............................................................................................................. 52 4.5. Groundwater discharge .................................................................................................... 52 4.6. Water budget ................................................................................................................... 52 4.6.1. Groundwater inflows .................................................................................................... 52 4.6.2. Groundwater outflows .................................................................................................. 53 4.6.3. Aquifer throughflow from south to north ....................................................................... 53 4.6.4. Groundwater storage ................................................................................................... 54 5 Model design & construction ..................................................................................................... 55 5.1. Common model components for steady state and transient models ................................ 55 5.1.1. Model platform ............................................................................................................. 55 5.1.2. Model domain and grid ................................................................................................. 56 5.1.3. Outer boundary ............................................................................................................ 57 5.1.4. Climatic data ................................................................................................................ 57 5.1.5. Saturated zone ............................................................................................................. 58 5.1.6. SZ Geological layers ..................................................................................................... 59 5.1.7. SZ Computational layers .............................................................................................. 61 5.1.8. Outer boundary conditions ........................................................................................... 61 5.2. Steady state model design / construction ......................................................................... 62 5.2.1. Selected steady state process models ......................................................................... 63 5.2.2. Steady state initial potential head .................................................................................. 63 5.2.3. Infiltration (recharge zones) ........................................................................................... 63 5.2.4. Hydraulic conductivity .................................................................................................. 64 5.2.5. Selected transient process models ............................................................................... 65 5.2.6. Simulation period and time stepping ............................................................................. 65 5.2.7. Overland flow (OL) ........................................................................................................ 66 5.2.8. Evapotranspiration (ET) ................................................................................................. 66 5.2.9. Unsaturated zone flow (UZ) .......................................................................................... 67 5.2.10. Saturated zone flow (SZ) .......................................................................................... 73 6 Parameter estimation ................................................................................................................ 75 6.1. General parameter estimation (calibration) strategy ........................................................... 75 6.1.1. Optimisation code ........................................................................................................ 75 6.1.2. Objective function ......................................................................................................... 76 6.1.3. Measure of goodness of fit' ......................................................................................... 76 6.2. Coupling the PEST suite and MIKE SHE model codes ...................................................... 77 6.3. Steady state parameter estimation ................................................................................... 77 6.3.1. Steady state objective function ..................................................................................... 77 6.4. Steady state parameter estimation results ........................................................................ 78