Abstract
Tidal variation and water level in aquifer is an important function in the coastal environment, this study attempts to find the relationship between water table fluctuation and tides in the shallow coastal aquifers. The study was conducted by selecting three coastal sites and by monitoring the water level for every 2-h interval in 24 h of observation. The study was done during two periods of full moon and new moon along the Cuddalore coastal region of southern part of Tamil Nadu, India. The study shows the relationship between tidal variation, water table fluctuations, dissolved oxygen, and electrical conductivity. An attempt has also been made in this study to approximate the rate of flow of water. Anyhow, the differences are site specific and the angle of inclination of the water table shows a significant relation to the mean sea level, with respect to the distance of the point of observation from the sea and elevation above mean sea level.
Highlights
Water levels in aquifer are a significant parameter in groundwater hydrology and a careful and detailed analysis of its spatio-temporal variation reveals useful information on the coastal aquifer system
This study aims in understanding the relation between water table, dissolved oxygen and electrical conductivity in the coastal aquifers and tidal influence in selected three locations in the coastal alluvial aquifers
There is a cyclic decrease and increase of the tidal height which is alternatively witnessed in both New moon (NM) and Full Moon (FM)
Summary
Water levels in aquifer are a significant parameter in groundwater hydrology and a careful and detailed analysis of its spatio-temporal variation reveals useful information on the coastal aquifer system. Ocean tides are known to affect the groundwater fluctuation in the coastal aquifers (Kim et al 2008). Ashtiani et al (2001) used an implicit finite-difference numerical solution of the simulate beach water table response to tidal forcing. Kim et al (2006, 2008) used a time-series monitoring model to solve the beach water-table response to tidal fluctuations. Regional groundwater flow and contaminant transport studies in the vicinity of the coastal zone assume that the coastal boundary water level is equivalent to the mean sea level and that tidal- and wave induced variations have negligible effect. This study aims in understanding the relation between water table, dissolved oxygen and electrical conductivity in the coastal aquifers and tidal influence in selected three locations in the coastal alluvial aquifers. The tidal- water table behavior was studied for two different periods during New moon (NM) and Full Moon (FM)
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