The potential susceptibility of urban hardrock aquifers to hydraulic and contaminant stresses: The case of Shah Alam, Malaysia

[摘要] Urban groundwater needs proper management since it is potentially susceptible to both hydraulic and chemical stresses. To manage an aquifer well, an understanding is needed of how the aquifer works. Much research has been done on urban aquifers but relatively little on hard-rock metasediment aquifers especially in equatorial climates such as Peninsular Malaysia. Therefore, research aim is to understand equatorial climate hard rock metasediment urban aquifers and their susceptibility to hydraulic and chemical impacts using data likely to be available to regulatory authorities. Shah Alam, a city developed over the last 50 years is investigated. Borehole log, meteorological, pumping test, and water quality data were used. The meta sandstone-shale sequence is fractured to at least 100m and covered by a weathering zone that is more clay rich where finer metasediments occur. Permeabilities ranged from 0.01 to 1 m/day. Results show that the abstraction activity has induced recharge into aquifer; which CO2 contents indicate that it had been through a soil zone. Some weathering reactions had occurred. Water quality samples with very low salinity barely above precipitation concentrations. Many of the water samples were polluted by one or more species, and sewer influences were common. It can be concluded that aquifer very susceptible to quality stress with a very limited pollution attenuation capacity. It is quite flashy system when pumping.

[发布机构] University:University of Birmingham;Department:School of Geography, Earth and Environmental Sciences

[关键词] Q Science;QE Geology