hydrogeological boundaries of stratovolcanoes
TRANSCRIPT
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Introduction Methods Preliminary results Closing
Hydrogeological boundaries of stratovolcanoes| Asian Physics Symposium 2015
Irawan, DE., Sumintadireja, P., Darul, A., Agustin, A.,Nurrochman, A., and Puradimaja, DJ.
Institut Teknologi Bandung
Aug 20, 2015 (version1)
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Introduction Methods Preliminary results Closing
Introduction
Methods
Preliminary results
Closing
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Introduction Methods Preliminary results Closing
Introduction
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Introduction Methods Preliminary results Closing
Problem
• Hydrogeological system in volcanic area still has manyquestions, in terms of:
• What is the dominant control to the groundwater flow• The nature of groundwater spring zone• How long is the average residence time in the system
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Introduction Methods Preliminary results Closing
Important role of volcanoes
• Water tower for the lowlands• Conservation
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Introduction Methods Preliminary results Closing
Location
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Location2
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Introduction Methods Preliminary results Closing
Location3
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Introduction Methods Preliminary results Closing
Location4
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Geological history
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Introduction Methods Preliminary results Closing
Methods
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Introduction Methods Preliminary results Closing
Tools
• Preliminary results, computer scale,• Using free program: Topodrive and ParticleFlow from
USGS,• It runs on Windows (off course), Mac and Linux.
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Model specifications
• 2D, finite elements• Boundary condition:
• upper boundary: topography• lower boundary: Tertiary sediments• left and right boundary: no flow
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Data
• Groundwater spring survey, mainly to identify the springzone:
• Gunung Ciremai: step wise 250 - 650 masl, 750 - 1250 masl,1300 - 1500 masl
• Gunung Karang-Pulasari: 200 - 400 masl• Gunung Gede: 500 - 750 masl
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Introduction Methods Preliminary results Closing
Preliminary results
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Introduction Methods Preliminary results Closing
Flownet
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Introduction Methods Preliminary results Closing
Flownet2
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Introduction Methods Preliminary results Closing
Flownet3
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Introduction Methods Preliminary results Closing
Discussions
• The model still couldn’t mimic the spring zone perfectly,• Another question arise? Which parameter plays dominant
control to the system,• We did some tryouts of sensitivity test.
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Discussions2
Parameter SensitivityDepth to lower boundary HighThickness of the aquifer LowIntercalation layers HighHydraulic properties Low
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Introduction Methods Preliminary results Closing
Closing
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Future directions
• Hopefully we can develop our own model, based on the realdata,
• It can be the basis of a more quantitative approach topredict spring emergence,
• More tools to support the model: water quality usingmultivariate analysis (cluster, PCA, decision tree)
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Acknowledgements
• Research funding: ITB• Field team: a group of very dedicated undergrad students
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Thank you
• This slides are made by R-Markdown syntax usingLATEXbackend
• Slides pdf are available at My Slideshare repo• Codes are available at My Github repo• @dasaptaerwin