Kemasinan air perigi dan subpermukaan Lembangan tuba Langkawi dengan analisis hidrokimia dan survei keberintangan elektrik menegak

Translated title of the contribution: Well water and subsurface salinity of tuba basin Langkawi by hydrochemical analysis and vertical electrical resistivity survey

Umar Hamzah, Abdul Rahim Samsudin, Abdul Ghani Rafek, Khairul Azlan Razak

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Tuba basin is an alluvial deposit located between granitic hill in the western part of Tuba island and the Setul formation sedimentary rocks in the eastern site of the island. This basin stretched along 3 km in the NE-SW direction with an estimated width of about 2 km. A geophysical survey using geoelectrical technique was carried out to figure out the subsurface structure, to detect the presence of underground aquifers and to investigate any saltwater intrusion into these aquifers in the basin. Concentrations of several elements in the well water were also analyzed to investigate any occurrence of salt water intrusion into the coastal aquifers. For this purpose, the vertical electrical sounding surveys were carried out at 22 randomly distributed stations in the study area. Water samples were also taken from 11 wells for hydrochemical analysis in the laboratory. Our results showed that all water samples were of fresh water type. Electrical resistivity profile constructed from stations located in NE-SW direction from Teluk Berembang to Telok Bujur shows a wide range of resistivities ranging from 4 Ωm to infinity. The top layer with a thickness of 1-3 m and resistivity values of 4 - 12 Ωm is interpreted as clay zone. This layer is overlying a much thicker layer of 10-50 m with resistivity values of 2 - 280 Ωm representing sandy material that may contain fresh water or sand with brackish water. Layers with resistivity values from thousands ohm.m to infinity are interpreted as either granite or limestone bedrock. Maximum thickness observed in this resistivity survey is approximately 70 m.

Original languageUndefined/Unknown
Pages (from-to)851-856
Number of pages6
JournalSains Malaysiana
Volume38
Issue number6
Publication statusPublished - Oct 2009

Fingerprint

well water
electrical resistivity
salinity
basin
aquifer
vertical electrical sounding
water
saline intrusion
coastal aquifer
geophysical survey
salt water
brackish water
alluvial deposit
analysis
sedimentary rock
bedrock
granite
limestone
well
clay

Keywords

  • Aquifer
  • Chemical analysis
  • Geoelectrical survey
  • Resistivity
  • Saline water

ASJC Scopus subject areas

  • General

Cite this

Kemasinan air perigi dan subpermukaan Lembangan tuba Langkawi dengan analisis hidrokimia dan survei keberintangan elektrik menegak. / Hamzah, Umar; Samsudin, Abdul Rahim; Rafek, Abdul Ghani; Razak, Khairul Azlan.

In: Sains Malaysiana, Vol. 38, No. 6, 10.2009, p. 851-856.

Research output: Contribution to journalArticle

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abstract = "Tuba basin is an alluvial deposit located between granitic hill in the western part of Tuba island and the Setul formation sedimentary rocks in the eastern site of the island. This basin stretched along 3 km in the NE-SW direction with an estimated width of about 2 km. A geophysical survey using geoelectrical technique was carried out to figure out the subsurface structure, to detect the presence of underground aquifers and to investigate any saltwater intrusion into these aquifers in the basin. Concentrations of several elements in the well water were also analyzed to investigate any occurrence of salt water intrusion into the coastal aquifers. For this purpose, the vertical electrical sounding surveys were carried out at 22 randomly distributed stations in the study area. Water samples were also taken from 11 wells for hydrochemical analysis in the laboratory. Our results showed that all water samples were of fresh water type. Electrical resistivity profile constructed from stations located in NE-SW direction from Teluk Berembang to Telok Bujur shows a wide range of resistivities ranging from 4 Ωm to infinity. The top layer with a thickness of 1-3 m and resistivity values of 4 - 12 Ωm is interpreted as clay zone. This layer is overlying a much thicker layer of 10-50 m with resistivity values of 2 - 280 Ωm representing sandy material that may contain fresh water or sand with brackish water. Layers with resistivity values from thousands ohm.m to infinity are interpreted as either granite or limestone bedrock. Maximum thickness observed in this resistivity survey is approximately 70 m.",
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