[show abstract][hide abstract] ABSTRACT: Clay mineralogy, texture size and statistical analyses were carried out on surface sediments from the continental shelf of Chennai, Bay of Bengal, India. The purpose of this study is to characterize the clay mineral distribution and its relation to the hydrodynamics off Chennai to identify the sources and transport pathways of the marine sediments. Characterization of clay minerals in coastal sediments by Fourier Transform Infrared (FTIR) spectroscopy has provided the association of quartz, feldspar, kaolinite, chlorite, illite and iron oxides (magnetite and hematite) derived from river catchments and coastal erosion. Kaolinite, chlorite, illite, iron oxides, and organic matter are the dominant clay minerals in Cooum, and Adayar rivers discharge and with the longshore transport these sediments are accumulated on the continental shelf of the Chennai coast. A high quartz zone and a high feldspar zone were identified in Marina, the high quartz zone being confined the sand zone and paralleling the coast. The strong relationships among the wave energy density, sand, quartz and carbonate revealed that wave induced littoral drift system play a dominant role in transportation and deposition of sediments in the Chennai coast. The sediment texture and minerals data are agree well with the previous results of hydrodynamics and littoral drift models in this region. Multivariate statistical analyses (Correlation matrix, cluster and factor analyses) were carried out and obtained results suggested that clay minerals and organic matter are trapped in silt and clay particles whereas quartz, feldspar and carbonate are associated with sand particles. The results of sediment sources and transport processes from this study will be useful to predict the fate of the pollutants released from land or the potential change in sediment delivery to coastal areas.
International Journal of Sediment Research 08/2014; 29:11-23. · 0.72 Impact Factor
[show abstract][hide abstract] ABSTRACT: Geochemical, mineralogical and textural analyses were carried out in core sediments off Adyar estuary, Bay of Bengal, India to record the contamination trend from urban and industrial activities during the historical past. Quartz, feldspar, kaolinite, chlorite and illite were the main lithogenic and clay minerals; carbonate was the predominant biogenic mineral. Trace metals (Fe, Al, Cu, Cr, Ni, Pb and Zn) indicate more enrichment in the surface sediment layers due to recent anthropogenic activities. The mean anthropogenic factor (AF) values for trace metals in core sediments decreased in the following order: Cr > Ni > Zn > Cu > Pb. The pollution load index (PLI) values in Adyar core sediments ranged from 1 to 1.25 with an average of 1.07. Based on AF, PLI, and sediment quality guidelines values for trace metals, significant metal enrichment and ecological risk were obtained in upper-most sediment layer. Multivariate statistical methods such as correlation matrix, principal component analysis and cluster analysis were carried out to find the relationships among the texture size, metals and minerals. The pollution of Adyar estuarine sediments was started in the 1960s, responding to the rapid economic development in Chennai coastal and Adyar estuarine region in the last five decades. Despite these high concentrations in the upper layer, development and expansion of industries are still continuing. The stricter regulations for the discharge and remediation of sediments are urgent for the conservation of environments and human health.
[show abstract][hide abstract] ABSTRACT: The abundance and distribution of the metals through the analyses of selected metals (iron
(Fe), manganese (Mn), zinc (Zn), Lead (Pb), copper (Cu), cobalt (Co) and nickel (Ni). Totally 20 surface
sediments were collected in Coleroon river estuary (each season 10 samples) during monsoon and
summer seasons of the year 2010, the samples were collected from mouth, estuary and freshwater zones
of the river. The results of present study reveals that the study periods higher levels of metal
concentration were observed in estuarine region were as lower levels were observed at mouth and
freshwater zones. This study illustrates the usefulness of method for estimating pollution impact such as
degree of contamination, enrichment factor and geo accumulation index for evaluation and interpretation
of the heavy metal concentrations in surface sediments of Coleroon estuary. The Enrichment and
contamination factor, geoaccumulation index shows that Zn, Pb and Cu unpolluted to moderately pollute
the sediments. The present study indicates that other sources should be evaluated in the long-term
Carpathian journal of earth and environmental sciences 12/2012; 8(1):39-46. · 1.50 Impact Factor
[show abstract][hide abstract] ABSTRACT: The hydrogeochemical characteristics of shallow groundwater in the coastal areas of Kodiakarai have been investigated using geochemical analysis and statistical techniques. The geochemical data (electric conductivity, pH, total dissolved solids, Ca, Mg, Na, K, NO3,SO4, Cl, and HCO3) of the water sample indicates that this water not suitable for drinking. The spatial distribution pattern indicates the total dissolved solids and electric conductivity were highly concentrated on the northeastern side, and that of sodium and chloride on the southwestern and northeastern side. The statistical treatment of the data (cluster, factor analysis) indicates three types of groundwater in the study area and that seawater incursion is the dominant process that influences the quality of the groundwater in the coastal region
Journal of Coastal Research 01/2012; · 0.50 Impact Factor
[show abstract][hide abstract] ABSTRACT: The aim of this study is to understand the
various sources and factors controlling the abundance
and distribution of clay minerals, sand, silt, clay and
organic matter of the surface sediments of Tirumalairajanar
Estuary in two different seasons. The study was
undertaken for two seasons, based on ten selected
stations all along the estuary, mouth and freshwater
zone. Furthermore, along the estuary region, clay and
silt were observed and also at few stations in the
upstream end. Organic matters in the sediments
appeared to be the main mechanisms for the distribution
of clay minerals in estuary indicated that the distributions
of clay minerals were comparatively higher during
postmonsoon than in premonsoon season. The clay
mineral assemblage consists mainly of chlorite, kaolinite,
montmorillonite, illite and very scarce gibbsite. The
clay from the sediments has been separated and studied
for mineral identification using X-ray diffraction analysis.
The present study also reveals that sediment texture
is one of the main controlling factors for the distribution
of organic matter.
Arabian Journal of Geosciences 01/2011; · 0.74 Impact Factor
[show abstract][hide abstract] ABSTRACT: Spatial distribution of the clay minerals shows considerable variation along 11 km stretch of the beach sediments of Tirmalairajanar coast. The clay mineral assemblage consists mainly of chlorite, kaolinite, montmorillonite gibbsite and very scarce illite. The clay from the sediments has been separated and studied for mineral identification using X-ray diffraction (XRD) analysis. XRD analysis of the samples treated with Ca and K, glycolated, and heated at various temperatures shows well-developed peaks of chlorite, illite, kaolinite, montmorillonite and gibbsite. An attempt has been made to decipher the origin of clay minerals along the coast of Tirumalairajanar
International Journal of Earth Sciences and Engineering. 01/2011;
[show abstract][hide abstract] ABSTRACT: The distribution of grain size parameters along 11 km stretch of the beach sediments between Karikal and Nagore, reveals that the mean grain size exhibits a marked decreasing trend on either side of the mouth of the Tirumalairajanar river which flow from west to east direction. The sediments are mainly of medium to coarse grained, moderately sorted, near-symmetrical skewed to fine skewed and leptokurtic to mesokurtic in nature. Interrelationship of various parameters shows bimodal nature of sediments having dominance of medium to coarse sand. The major part of the sediment fall in a coarse to fine grained category (sand and silt). Based on the CM (Coarser one percentile value in micron) pattern the sediment fall in rolling and suspension field. These factors includes that the sediments were discharged from the river, offshore sediments, sediments eroded from a source rock, the effect of wave sorting, and the northward and southward littoral drift. The study results indicate that the Tirumalairajanar River is the most important source for modern sediments in the study area. The agitation by the waves is an important sorting mechanism in the study area, and the net sediment transport in the study area is northward. The findings are based on the grain sizes and also corroborated by short-term observations of the beach sediment dynamics and transport during the monsoon and summer seasons between Karaikal and Nagore region.
International Journal of Sediment Research 01/2011; · 0.72 Impact Factor
[show abstract][hide abstract] ABSTRACT: Morphological mapping plays an essential role in
understanding river processes. Evaluation of the morphological
parameters requires preparation of basin, upstream
and downstream, stream link, stream network, stream order,
flow direction, flow accumulation, and digital elevation
model, which help to understand the nature of the river.
Assessments of morphological digital maps provide upstream
and downstream flow rates, slope variation, sedimentation,
and specific stream erosive power in river systems.
The river patterns of the study area mainly controlled by
geological nature. Therefore, this paper discusses conceptual
foundations and illustrates how mapping approaches can
be used to produce morphological information of Tirumalairajan
Arabian Journal of Geosciences 01/2011; · 0.74 Impact Factor
[show abstract][hide abstract] ABSTRACT: Distribution patterns of grain size characteristics and organic matter in the estuary sediments of India from Tirumalairajanar river have been studied. The present study reveals that sediment texture is one of the main controlling factors for the distribution of organic matter. The sediments are mainly medium to coarse grained, moderately to poor sorted, fine skewed to coarse skewed and leptokurtic to mesokurtic in nature. Based on the CM pattern the sediment fall in rolling and suspension field. These textural parameters have been examined to understand hydrodynamics of the depositional environment.
INTERNATIONAL JOURNAL OFGEOMATICS AND GEOSCIENCES. 01/2010;
[show abstract][hide abstract] ABSTRACT: Seasonal study on the ground water quality was carried in the coastal town of Nagapattinam, Tamil Nadu. Totally seventy two groundwater samples were collected from nine wells covering three season (postmonsoon, summer, premonsoon) during 2007. The groundwater quality was determined on the basis of (APHA-1998), were physical and chemical parameter like (Ec,pH,TDS,Ca,Mg,Na,K,No3,So4,Cl). The analytical result indicates two or three well water suitable for drinking purpose, remaining suitable for domestic, irrigation and industrial usage. The piper trilinear diagram indicates that the majority of the sample falls in Na, Mg, Ca facies is dominating in groundwater, which is followed by Cl, SO4. The USSL classification indicates most of the samples fall in salinity and sodium hazard. Finally correlation coefficient calculation method also adapted. [Researcher. 2010;2(8):73‐83]. (ISSN: 1553‐9865
[show abstract][hide abstract] ABSTRACT: Petroleum hydrocarbon concentrations (PHC) of surface sediments along the Chennai coast, India, were measured by UV-Fluorescence (UVF) Spectroscopy and the results are expressed in terms of Chrysene equivalents. The concentration of PHC in sediment varies widely (from 1.88 ppm to 39.76 ppm) as compared to the baseline (1.88 ppm) with higher values obtained in the northern part of the study area. The highest magnetic susceptibility (96.8 × 10−8 m3kg−1) value was determined from the Chennai harbour area. The magnetic parameters show that the Chennai coastal sediments are dominated by ferrimagnetic minerals. The positive correlation (r2 = 0.86; p < 0.05) between petroleum hydrocarbon concentrations and magnetic susceptibility suggests that the magnetic minerals and petroleum hydrocarbons along the Chennai coast are derived from the same sources. Factor analysis shows that the magnetic concentration dependent parameters (χ, χARM and SIRM) covary with the petroleum hydrocarbon concentration, suggesting that large amounts of magnetic minerals originate from anthropogenic activities. It is evident that using magnetic measurements may be considered a simple, rapid, cheap and non-destructive method to determine petroleum hydrocarbon concentrations in coastal sediments. Furthermore, this technique may be applied to petroleum exploration studies. Magnetic susceptibility measurements in sediments have been proposed as complementary or alternative means of exploration and assessment of hydrocarbon reservoirs.
Marine and Petroleum Geology 01/2010; · 2.11 Impact Factor
[show abstract][hide abstract] ABSTRACT: An attempt has been made in this present work to determine the groundwater quality in parts of Vedaraniyam region, Tamilnadu. Totally, eighty groundwater samples were collected from open and dug wells, covering three seasons (Postmonsoon, summer and premonsoon seasons) and analyzed for physicochemical parameters (pH, EC, TDS, TH, Na, K, Ca, Mg and Cl, SO4
, HCO3 , NO3 ) it order to understand
the hydro geochemistry of the water. The results of analysis were interpreted with geology and geomorphology of the area and also by various geochemical diagrams such as Piper trilinear plot and USSL classification diagram. Suitability of this water for its utility was verified using Indian standards. The result indicates irrespective of the seasons that only one well is suitable for drinking purpose, with remaining suitable for domestic and irrigation purpose. Further, the results points out that most of the well water falls in Na-Cl type indicating the influence of seawater in these wells which is confirmed by Piper plot. According to USSL classification of water quality of the samples belong to C4 S4, C4 S3 classes water are also found in the area which moderately suitable for irrigation. The influence of sea water on the fresh water aquifer in this coastal region needs special attention in terms of monitoring and for sustainable management.
Research Journal of Environmental and Earth Sciences. 01/2010;