Koolpinyah groundwater system 2017 groundwater flow model update
Details:
Title
Koolpinyah groundwater system 2017 groundwater flow model update,
Creator
Knapton, Anthony,
Collection
E-Publications,
E-Books,
PublicationNT,
7/2019,
DENR Technical Report Number 7/2019,
Date
2017-03,
Location
Koolpinyah Groundwater System,
Description
The objective of the Koolpinyah Groundwater System modelling study is to update the existing FEFLOW (EHA, 2007) to included improved knowledge of the system and produce a groundwater model that is capable of supporting the analysis of possible impacts of land use and the associated groundwater development on groundwater levels and baseflow discharge within the Koolpinyah Groundwater system. The updated model will be designed to:
support annual allocation process by forecasting the impacts of current pumping on the end of dry season groundwater levels and baseflow using wet season recharge estimates.
examine the impacts of various pumping scenarios over a specified climatic period. Impacts are assessed by comparing the groundwater levels and changes to baseflow of development scenarios to a no-pumping or natural scenario.,
Notes
Prepared for Department of Environment and Natural Resources (DENR) by Cloudgms,
Table of contents
Executive Summary -- 1 Introduction -- 1.1 Study area -- 1.2 Scope -- 1.3 Objectives -- 1.4 Model classification -- 1.5 Limitations -- 2 Model input updates -- 2.1 Available climatic data -- 2.2 Topography -- 2.2.1 Shuttle Radar Topography Mission (SRTM) -- 2.2.2 Topographic data uncertainty -- 2.3 Geology -- 2.3.1 Geological overview -- 2.3.2 Basement structures -- 2.3.3 Giants Reef Fault -- 2.4 Recharge update -- 2.4.1 Recharge mechanism -- 2.4.2 Previous recharge modelling methodology -- 2.4.3 Current recharge modelling methodology -- 2.5 Groundwater level monitoring data update -- 2.6 Groundwater extraction -- 2.6.1 EHA 2007 groundwater extraction estimate -- 2.6.2 DLRM 2014 groundwater extraction estimate -- 3 hydrogeological conceptualisation -- 3.1 Hydrostratigraphy -- 3.2 Groundwater flow and dynamics -- 3.3 Recharge mechanism -- 3.4 Groundwater discharge -- 3.5 Surface water – groundwater connectivity -- 3.6 Boundary conditions at the coast and along Adelaide River -- 4 Mode design -- 4.1 Code used to construct model -- 4.2 FEFLOW model setting -- 4.4 Model domain mesh development -- 4.4.1 Super mesh development -- 4.4.2 Finite element mesh development -- 4.5 Layer geometry -- 4.6 Areal fluxes – recharge & evapotranspiration -- 4.6.1 Recharge -- 4.6.2 Evapotranspiration -- 4.7 Boundary conditions -- 4.7.1 Seepage face boundary conditions at the ground surface -- 4.7.2 Cauchy boundary conditions - rivers / springs -- 4.7.3 Cauchy boundary conditions - coast -- 4.7.4 Representation of production bores -- 4.7.5 Reporting of boundary condition fluxes -- 4.8 Aquifer parameters -- 5 Parameter estimation -- 5.1 Transient FEFLOW model setup -- 5.1.1 Recharge -- 5.1.2 Aquifer parameters -- 5.2 Parameter estimation -- 5.2.1 Transient objective function -- 5.3 Surrogate model -- 5.3.1 Mesh refinement -- 5.3.2 Free surface constraint -- 5.3.3 Free surface residual water depth -- 6 Calibration performance -- 6.1 Introduction -- 6.2 Model convergence -- 6.3 Model water balance -- 6 Qualitative performance -- 6.5 Quantitative performance -- 6.5.1 Groundwater level hydrographs -- 6.6 Parameter distributions -- 6.6.1 Hydraulic conductivity distributions -- 6.6.2 Specific yield distributions -- 6.7 Model outputs -- 6.7.1 Layer 1 groundwater head contours -- 6.7.2 Layer 3 groundwater head contours -- 6.7.3 Groundwater discharge at gauged locations -- 7 Sensitivity analysis AND UNCERTAINTY -- 7.1 Hydraulic conductivity -- 7.2 Storage parameters -- 7.3 River node elevations -- 7.4 Model uncertainty -- 8 Historic pumping impacts compared to natural conditions -- 8.1 Groundwater drawdown plots -- 8.2 Groundwater level hydrographs . -- 8.3 Stream depletion hydrographs -- 9 Conclusions -- 10 Recommendations -- 11 REFERENCES -- APPENDIX A MIKE SHE 1D recharge modelling -- A.1 Introduction -- A.2 MIKESHE software -- A.3 MIKE SHE model setup -- A.4 Overland flow -- A.5 Unsaturated zone -- A.6 Simplified macro-pore flow (bypass flow) -- A.7 Vegetation data. -- A.8 Saturated zone -- A.9 Recharge estimate -- A.10 River discharge estimate -- A.11 Water budget -- APPENDIX B Groundwater Level hydrographs,