Butler, Adrian

Jackson, Christopher

Jones, Michael

Upton, Kirsty

NERC Open Research Archive

© NERC All rights reserved Multi-scale modelling of borehole yields for DO assessment in chalk aquifers K Upton, A Butler, C Jackson, M Jones © NERC All rights reserved Deployable Output Deployable Output  Reliable (sustainable) yield of a source  Constrained by properties of  aquifer and borehole  Also constrained by the surrounding environment, licence conditions, water quality, and capacity of treatment plant/output mains Limitations of current methodology:  Availability and quality of operational data  Vertical heterogeneity?  Interference?  Climate change?  Pump Level © NERC All rights reserved  Availability and quality of operational data  Reconstruct operational GWLs during historic droughts  Vertical heterogeneity  Represent non-linear processes at borehole scale  Interference  Represent abstraction borehole in regional context  Climate change  Apply scenarios to assess impact Modelling Sustainable Yield 1975 1980 1985 1990 1995 2000 2005 Reconstruction Climate change projections 1920 ..... ..... 2100 AIM: Develop a modelling tool to address limitations of the current methodology © NERC All rights reserved Multi-scale Groundwater Modelling SPIDERR Flow Model  Coupled radial-cartesian GW model for simulating abstraction boreholes within regional GW models  ZOOMQ3D  Regional GW modelling code OpenMI © NERC All rights reserved Multi-scale Groundwater Modelling SPIDERR Flow Model: Radial Model   Finite difference approximation   Darcy-Forchheimer (non-linear flow)  Logarithmic radial node spacing  Vertical layering  Vertical & horizontal heterogeneity    Partially or fully penetrating borehole  Borehole storage   Borehole casing & screening  Seepage face development   © NERC All rights reserved Multi-scale Groundwater Modelling SPIDERR Flow Model: Radial-Cartesian Coupling   Hybrid radial-Cartesian method applied in petroleum reservoir models  Limitations of grid construction  BUT  Quick, simple & user friendly  © NERC All rights reserved Multi-scale Groundwater Modelling  OpenMI standard for linking models  Data exchange maintains consistency between two models  Quick and easy to link several borehole models  Make use of existing regional models  OpenMI: Linking SPIDERR Flow Model with ZOOMQ3D © NERC All rights reserved Model Application 1.  Calibration of SPIDERR using pumping test data 2.  Coupling of SPIDERR with ZOOMQ3D regional model 3.  Historic simulation and comparison with operational data 4.  Abstraction scenarios to inform sustainable yield assessment  © NERC All rights reserved Model Application 1.  Calibration of SPIDERR using pumping test data  SDT: drawdown SDT: abstraction rates CRT: drawdown CRT: abstraction rates Modelled and observed drawdown for the SDT and CRT © NERC All rights reserved Model Application 2.  Coupling of SPIDERR with ZOOMQ3D regional model  ABH Location SPIDERR: radial extent SPIDERR: Cartesian extent Observed (daily) and modelled (weekly) abstraction rates with reconstruction back to 1971 © NERC All rights reserved Model Application 3.  Historic simulation and comparison with operational data Modelled and observed GWLs (OBH)  Observed (daily) and modelled  (weekly) operational abstraction rates Modelled and observed operational GWLs (ABH)  © NERC All rights reserved Model Application 4.  Abstraction scenarios to inform sustainable yield assessment Modelled operational GWLs (ABH) under abstraction scenarios Modelled baseflow under abstraction scenarios © NERC All rights reserved Conclusions  Multi-scale methodology provides useful tool for assessing the sustainable yield of supply boreholes during drought   Suggests whether further work would be useful to determine whether larger yield could be sustained OR if deployable output should be reduced   Coupling allows impacts on neighbouring abstractions/rivers to be assessed   Development to allow two radial models to be simulated in a single Cartesian grid   Tool for assessing climate change impacts  

Multi-scale modelling of borehole yields for Deployable Output assessment in Chalk aquifers

http://nora.nerc.ac.uk/id/eprint/514350/1/GWHiddenAssetConference_Upton.pdf

Multi-scale modelling of borehole yields for Deployable Output assessment in Chalk aquifers

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