Document Detail

Effects of intensive urbanization on the intrusion of shallow groundwater into deep groundwater: examples from Bangkok and Jakarta.
MedLine Citation:
PMID:  18804843     Owner:  NLM     Status:  MEDLINE    
Asian megacities have severe pollution problems in both coastal and urban areas. In addition, the groundwater potential has decreased and land subsidence has occurred because of intensive groundwater pumping in urban areas. To prevent the adverse effects of urbanization on groundwater quality, it is necessary to confirm the changes in groundwater flow and contaminant transport caused by urbanization. We examined the effects of urbanization on contaminant transport in groundwater. The research areas were located around Bangkok, Thailand, and Jakarta, Indonesia, cities with populations of approximately 8 and 12 million, respectively. Each metropolitan city is located on a river delta and is adjacent to a bay. We measured the water level and collected water samples at boreholes at multiple depths (100 to 200 m) in 2004 and 2006 in Bangkok and Jakarta, respectively. The current hydraulic potential is below sea level in both cities because of prior excess abstraction of groundwater. As a result, the direction of groundwater flow is now downward in the coastal area. The Cl(-) concentration and delta(18)O distributions in groundwater suggest that the decline in hydraulic potential has caused the intrusion of seawater and shallow groundwater into deep groundwater. Concentrations of Mn and NO3(-)-N in groundwater suggest the intrusion of these contaminants from shallow to deep aquifers with downward groundwater flow and implies an accumulation of contaminants in deep aquifers. Therefore, it is important to recognize the possibility of future contaminant transport with the discharge of deep groundwater into the sea after the recovery of groundwater potential in the coastal areas.
Shin-ichi Onodera; Mitsuyo Saito; Misa Sawano; Takahiro Hosono; Makoto Taniguchi; Jun Shimada; Yu Umezawa; Rachmat Fajar Lubis; Somkid Buapeng; Robert Delinom
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-09-19
Journal Detail:
Title:  The Science of the total environment     Volume:  404     ISSN:  0048-9697     ISO Abbreviation:  Sci. Total Environ.     Publication Date:  2008 Oct 
Date Detail:
Created Date:  2008-10-17     Completed Date:  2008-12-19     Revised Date:  2009-05-14    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  401-10     Citation Subset:  IM    
Graduate School of Integrated Arts and Sciences, Hiroshima University, Japan.
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MeSH Terms
Chlorides / analysis
Environmental Monitoring*
Manganese / analysis
Models, Biological
Nitrates / analysis
Nitrogen / analysis
Oxygen Isotopes / analysis
Water Movements
Water Pollutants, Chemical / analysis*
Water Supply / analysis*
Reg. No./Substance:
0/Chlorides; 0/Nitrates; 0/Oxygen Isotopes; 0/Water Pollutants, Chemical; 7439-96-5/Manganese; 7727-37-9/Nitrogen
Erratum In:
Sci Total Environ. 2009 Apr 15;407(9):3208
Corrected and Republished In:
Sci Total Environ. 2009 Apr 15;407(9):3209-17   [PMID:  19437605 ]

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