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16-17 January 2008NGMS4 - PR07 software workshop 3
Recharge pilot
Purpose:
. investigate if PCRaster dynamic script language could be used to represented recharge proces models prevents the need for recharge module adapters may provide flexibility in recharge modelling
. Case studies East Kent (EA-Recharge) Test Itchen (4R)
. Conducted byWillem van Deursen (PCRAster Environmental Software) Janet Rily (ESI) &Tim Leewis (Entec)
16-17 January 2008NGMS4 - PR07 software workshop 4
Recharge pilot conclusions
Conclusions
both EA and 4R models are straightforward to convert to PCRaster script EA, 4R and PCRaster model outcomes are practically similar delays and exchange to Modflow have to be dealt with in NGMS not all options of 4R and EA-code dealt with, but no reason to believe it cannot be dealt with some minor issues in process representation require attention in future data conversion is straightforward, can be automized uniform naming/identification scheme desired for soil types, crop types, geology typesand land use types
16-17 January 2008NGMS4 - PR07 software workshop 8
In general
Models handed over are not consistent
how consistent should they be on the system
> transmissivity & thickness> boundary fluxes> horizontal flows> evaporation
Better instructions needed from seniors/custodians
16-17 January 2008NGMS4 - PR07 software workshop 9
Presentation issues
Transmissivity and Thickness ? static dynamic
Boundary fluxes ?
Evaporation ?
16-17 January 2008NGMS4 - PR07 software workshop 10
Temporal resolution
. monthly
. half-monthly
. each 10 days
. each 3 days (output only)
. daily (run in combination with monthly)
High resolution creates large data sets
few Gbs compression algorithms cannot beat this network and download times are affected
16-17 January 2008NGMS4 - PR07 software workshop 11
Are those resolutions needed ?
Run purpose:
scanning alternatives detailed analysis of preferred alternative
Most runs can be done with larger step size
Some runs require the temporal details
16-17 January 2008NGMS4 - PR07 software workshop 12
Resolution Proposal
Distinguish two types of runs (if indicated and prepared by custodian) monthly (or as needed for flow representation) detailed (e.g. daily or 3 daily)
Advantage: most runs require have ‘small’ output sets> faster runtime> faster download> smaller database / less free disk space needed few runs require details> no problem to wait
Disadvantage: more maintenance (configuration) Scenarios need to be redefined
16-17 January 2008NGMS4 - PR07 software workshop 13
Scenario definition issues - accommodated
Accommodated:
. modification of existing groundwater abstractions
. specification of new groundwater abstractions
. input file selection (e.g. LTA)
Not tested:
. modification of existing surface water abstractions/discharges
16-17 January 2008NGMS4 - PR07 software workshop 14
Scenario definition issues – what else ?
Recharge:
. rainfall: pointbased or grid based ?
Abstractions:
. Ely Ouse: abstractions 50% of LTA
Groundwater schemes
how/where what (thresholds, time series ?)
16-17 January 2008NGMS4 - PR07 software workshop 16
Acceptance Responsibilities
. Custodians are responsible for testing and acceptance of model outputs
. HQ is responsible for testing and acceptance of software features
Please don’t wait till the last end
Ask for a stand alone application if desired
Testing takes place in June/July/August reserve time
16-17 January 2008NGMS4 - PR07 software workshop 17
Output check
. Requires small test plan per model
. which runs
. which outputs (parameters/locations/balances)
. criteria for acceptable deviation to pass test
Note
. default runs: use all Modflow files as is
. modified runs: RCH and WEL are generated by NGMS/ModuleAdapter
. Modflow-executables are compiled with Intel compiler version 10
16-17 January 2008NGMS4 - PR07 software workshop 18
Output check
Default runs
. compare Modflow.out from NGMS with original
. compare output from NGMS with original at selected locations
. compare water balances from NGMS with original
Modified runs
. compare difference between NGMS_default and NGMS_modified run without any modifications
16-17 January 2008NGMS4 - PR07 software workshop 20
Archiving – why and when do you use it ?
When to use to archiving ?
. …..
What to archive
. default scenarios
. valuable what-if scenarios
When
. after before uploading/upgrading new model
How ?
. manually scheduled