Journal of Earth Science & Climatic Change
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Climate variability, climate change, and anthropogenic activities have impacts on the availability of water resources, i.e.
rainfall, evapotranspiration, surface water, and groundwater. Climate change is a significant and irreversible change due
to global warming in the distribution of weather patterns over periods ranging from decades to millions of years resulting in
a change in average trend weather conditions. On the other hand, natural climate variability is a change of weather patterns in
cycles and appears to be periodic variation on various time scales. Anthropogenic processes include pumping for irrigation,
industrial usage, and human consumption and may be altered from rules and regulations and indirectly from the climate change.
Abrupt implementation of regulations, e.g. increasing groundwater usage fee or prohibiting the use of groundwater, can create
rapid and continuing change in groundwater level. Deep groundwater is considered to be not only a decent buffer material due
to the resistance nature of deep groundwater but may also absorb and memorize various events in their signals. The study area is
the Lower Chao Phraya Groundwater Basin located in the Central Plain of Thailand. This deep multi-layer aquifer system situates
in a highly populated area with the history of land subsidence due to heavy pumping. The method involves decomposing deep
groundwater signals into long-term trend and periodic cycles employing Fourier series analysis. The indicators of climate change
and human activities suppress in the long term trend or low frequency signal of groundwater levels. The climate variability results
in periodicity or high frequency signal.
Uma Seeboonruang has completed her Ph.D. from University of California, Davis and postdoctoral studies also from the same university and
Kyushu, Tokai University majoring in groundwater flow and contaminant transport. She has conducted numerous research projects and published a
number of papers regarding to soil, groundwater acidity and salinity problems and recently has started the study of the impact of climate change on
groundwater and soil salinity in Thailand.
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