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Heterogeneous Geological Control on Volcanic Aquifers at Mount Ciremai, West Java, Indonesia
Authors:
Dasapta Erwin Irawan Prihadi Soemintadiredja
Diky Irawan Asep Saepuloh Cut Novian>
EUROPEAN GEOSCIENCES UNION GENERAL ASSEMBLY
Vienna, 22-‐27 April 2012
Applied Geology Research Group, Faculty of Earth Sciences and Tech. Institut Teknologi Bandung INDONESIA
Board of Regional Planning and Development, West Java Province,INDONESIA
Directorate of Higher Education, Ministry of Education, INDONESIA
University Partnership Program Chevron Indonesia Company
HALL A #343 24/04/12
Introduc>on
• Strato volcano, at Kuningan and Majalengka Regency, West Java Province • Spring belt with no less than 160 springs; discharged over 8000 L/sec • The scien>fic interest is to iden>fy various geological control to the groundwater
system 2
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Introduc>on
• Previous research results: – volcanic geology (Situmorang, 1995) – combina>on of porous and fractured aquifer systems (Puradimaja
et.al, 2003) – radial groundwater flow padern of the volcanic deposits and recharge
area located above the 750 masl (Irawan et.al, 2002; 2008) – three hydrogeological systems (Irawan et.al, 2009) and spring EC
measurements (Irawan, 2011)
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Problems
UN-‐Known lithology UN-‐Known structures
UN-‐Known hydrogeology ???
Large uncertainty, Need large number of data,
Maximum varia>on, Con>nuous >me series measurement
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Methods
• Geological observa>ons: lithology and structures
• Measurements at 160 spring loca>ons (140 on east slope and 21 on west slope): T, EC, TDS, pH.
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Geological seing (1)
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Geological seing (2)
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Results (1): Eleva>on vs Q chart
• East slope: – 3 groundwater systems – 2 faults as boundary – Iden>fied lithological contact zone
• West slope: – 2 systems – interac>on between aquifers towards lower eleva>on
– possible fault boundary.
East slope
West slope
B1 B2
B’
8
B’
B’’
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Results (2): Eleva>on-‐water temp. chart
• majority of hypothermal signal, on both slopes, indica>ng rela>vely deep groundwater flow.
• a boundary signals • The interpreta>on is also
confirmed with geophysical results and sta>s>cal analyses.
• Iden>fied contact zone with sedimentary rocks.
East slope
West slope
B1
B2
B’
9
B’
B’’
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Results (4) TDS-‐Water temp. chart
• east slope: 3 groups – 1. meteoric groundwaters
homogeneous plot on east slope.
– 2. transi>on groundwaters – 3. geothermal/sedimentary
related groundwaters – Lithological contact zone
• west slope: similar zones with less mineraliza>on system
East slope
West slope
B1 B2
B’
10
B’’
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Conclusions (1)
• The methodology could be applied on volcanic deposit area with several notes: – need to get maximum number of varia>on for more accurate interpreta>on.
– Need other sub surface analysis, such as geophysical mapping to get a beder understanding on the hydrogeological frame work.
– Boundary may comes as faults, the most frequently observed, or other possible boundaries lithological contact and folds.
– It can be used to iden>fy un-‐exposed geological condi>ons.
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Conclusions (2)
• Non-‐linearity occurs when the groundwater reaches the different lithology (sedimentary rocks) and or geothermal system.
• Anomalously large springs suggest that the aquifer boundaries are larger than the topographically watersheds.
• Possible faults as somehow leaking fault system.
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Thank you
Applied Geology Research Group, Faculty of Earth Sciences and Tech. Institut Teknologi Bandung INDONESIA
Board åof Regional Planning and Development, West Java Province,INDONESIA
Directorate of Higher Education, Ministry of Education, INDONESIA
University Partnership Program Chevron Indonesia Company
The authors also would like to thank the following ins>tu>ons:
[email protected] blog.fitb.itb.ac.id/derwinirawan
Visit West Java The volcano province of Indonesia
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References
• Irawan, D.E. and Puradimaja, D.J., 2002, Geological Mapping and Groundwater Characterization an Approach to Spring Recharge Area Conservation, International Conference on Urban Hydrology for the 21st Century, 14-18 October 2002, Kuala Lumpur
• Puradimaja, D.J., Hendri Silaen, Irawan, D.E., 2003, New Hydrogeological Determination of Normal and Hot Spring Complex at Ciwaringin – G. Kromong – Pesawahan, North of Ciremai Volcano, West Java, Indonesia, International Conference on Mineral and Energy Resources Management 2003, 28 – 31 July 2003, Yogyakarta.
• Irawan, D.E., Puradimaja, D.J., Notosiswoyo, S., Soemintadiredja, P., 2008, Hydrogeological Model of Stratovolcano using Physical and Chemical Parameters of Groundwater at Mt. Ciremai’s Spring Zone, presented at International Symposium on Efficient Groundwater Resources Management Bangkok Thailand.
• Irawan, D.E., Puradimaja, D.J., Notosiswoyo, S., Soemintadiredja, P., 2009, Hydrogeochemistry of volcanic hydrogeology based on cluster analysis, of Mount Ciremai, West Java, Indonesia, Journal of Hydrology 376 (2009) 221–234, doi:10.1016/j.jhydrol.2009.07.033
• Irawan, D.E., Puradimaja, D.J., Notosiswoyo, S., Soemintadiredja, P., 2011, Characterization of Tropical Volcanic Hydrogeology based on Spring Discharge, Temperature and Electrical Conductivity Analysis: Mount Ciremai, West Java Province, Indonesia, EGU General Assembly
• Sumintadireja, P., Saepuloh, A., Irawan, D., Irawan, D.E., and Fadillah, A., 2012, The Application of Remote Sensing and Magneto-Telluric for Geothermal Exploration at Mount Ciremai, Kuningan Regency, West Java, Indonesia, ITB Journal of Sciences (in press)
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