Territory Stories

Development of a Groundwater Model for the Western Davenport Plains

Details:

Title

Development of a Groundwater Model for the Western Davenport Plains

Creator

Knapton, Anthony; CloudGMS Pty Ltd

Commissioned by

Northern Territory. Department of Environment, Parks and Water Security

Collection

E-Publications; E-Books; PublicationNT; WRD Technical Report 27/2017

Date

2018-03

Location

Western Davenport Water Control District

Abstract

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.

Notes

Made available by via Publications (Legal Deposit) Act 2004 (NT); Prepared for Dept Environment and Natural resources

Table of contents

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

Language

English

Subject

Groundwater; Northern Territory; Western Davenport Water Control District; Conceptual mode

Publisher name

Northern Territory Governmnet

Place of publication

Palmerston

Edition

version 2.0

Series

WRD Technical Report 27/2017

Format

ix, 127 pages : colour illustration and maps ; 30 cm

File type

application/pdf

ISBN

9781743502976

Use

Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government

License

https://creativecommons.org/licenses/by/4.0/

Related links

https://hdl.handle.net/10070/842058 [LANT E-Publications: Development of a Groundwater Model for the Western Davenport Plains, version 1.1]

Parent handle

https://hdl.handle.net/10070/858845

Citation address

https://hdl.handle.net/10070/858846

Page content

Western Davenport WCD Groundwater Model (v2.0) Parameter Estimation CloudGMS 77 6.2. Coupling the PEST suite and MIKE SHE model codes The automated parameter estimation process requires coupling of the optimisation software and the modelling software by updating model input files with PEST determined values and reading the resulting model outputs in a form suitable for comparison with the measured observations. To facilitate these two processes utilities were developed using the DHI Timeseries Package downloadable from http://www.mikebydhi.com/download. 6.3. Steady state parameter estimation The steady state model parameters were optimised in accordance with the guiding principles outlined by Barnett et al, (2012). The steady state model parameter estimation was undertaken using PEST (Doherty, 2010). The hydraulic conductivity at the pilot points and the infiltration fraction zones were adjustable during the parameter estimation process. 6.3.1. Steady state objective function The objective function used the average' groundwater levels from 177 bores within the Western Davenport WCD model domain. It was assumed that the average value of the available groundwater level record for each bore approximated the steady state level. It is expected that using this assumption may introduce an error of up to 5 metres. The average groundwater levels used in the steady state parameter estimation process are presented below in Table 17. Table 17 Bores and average heads (mAHD) used in the steady state parameter estimation. Bore Id. Ave. Head Bore Id. Ave. Head Bore Id. Ave. Head Bore Id. Ave. Head RN000436 301.70 RN010155 398.00 RN014877 421.90 RN017801 422.90 RN000437 351.40 RN010222 372.30 RN014878 434.70 RN017803 469.80 RN000438 371.00 RN010279 381.10 RN014944 456.90 RN018066 367.90 RN000441 512.10 RN010538 362.70 RN015174 347.10 RN018067 441.00 RN000442 422.20 RN010721 394.70 RN015175 352.90 RN018083 434.90 RN000443 420.00 RN010744 362.90 RN015176 373.10 RN018112 367.50 RN000445 491.00 RN010843 413.60 RN015244 352.00 RN018114 369.60 RN000682 361.00 RN011007 367.10 RN015245 355.00 RN018116 370.90 RN000683 365.00 RN011008 369.10 RN015578 342.00 RN018117 367.20 RN001476 354.00 RN011011 371.00 RN015580 352.00 RN018118 367.80 RN001800 359.10 RN011012 367.90 RN015581 350.00 RN018241 364.10 RN002047 361.50 RN011013 367.90 RN015583 356.10 RN018242 360.70 RN002048 348.90 RN011178 367.00 RN015584 359.70 RN018265 482.20 RN002049 320.70 RN011180 365.20 RN015585 353.20 RN018338 361.40 RN002050 333.60 RN011657 393.20 RN015964 462.00 RN018346 365.20 RN002051 342.20 RN011658 392.90 RN015965 456.90 RN018347 363.10 RN002052 333.50 RN011659 392.90 RN015966 385.90 RN018348 359.00 RN002053 345.00 RN011876 396.20 RN015967 348.10 RN018387 364.70 RN005394 364.80 RN011877 398.30 RN015968 353.00 RN018388 366.00 RN005409 359.00 RN012014 378.00 RN016196 342.80 RN018390 367.20 RN005427 362.80 RN012697 388.30 RN016782 423.00 RN018401 356.90 RN005788 361.10 RN012698 388.30 RN016797 354.00 RN018403 365.90