A study on sediments depositional mechanism at Nayakankuppam coast, Tamilnadu, India (original) (raw)
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A Study on Sediments Depositional Mechanism at
2016
— Textural analysis carried out for the sediments of the Nayakkankuppam coast revealed that inlet part is dominated by fine sand, central part is dominated by medium sand and outlet part is dominated by coarse sand. The grain size parameters namely Mean size (MZ), standard deviation (σ1), skewness(Ski), and kurtosis (KG) of percentile values derived from the cumulative curves following Folk and Ward and the moment technique based upon grouped data are most widely used. It is observed that in Nayakkankuppam, most of the samples were fallen in the moderately well sorted to well sorted nature. Skewness measures asymmetry of frequency distribution and marks the position of mean with respect to median. The fine skewed nature of the sediments clearly exhibits sediment input from various sources of tributaries. The finely skewed nature is also implies a low velocity than normal, this skewness data indicated that the sediments are nearly symmetrical to fine skewed, the median class of the s...
Textural Characterization of Coastal Sediments along Tamil Nadu Coast, East Coast of India
Procedia Engineering, 2015
Particle size characterizations of beach sediments along Tamil Nadu coast was carried out in the present study. The main objective of this work is to identify the textural behaviour of beach sediments and how wave energy correlates with grain size distribution.To achieve this goal tri-plot analysis was performed. Grain size characteristics such as central tendency, kurtosis and skewness were estimated using an updated version of the GRADISTAT programme and discussed in this paper. The highest sediment samples having medium sand with unimodal and bimodal characters at all along the coast. The entire coastal area was characterized as well sorted, moderately well sorted and moderately sorted sediment environments. Sediments were identified as fine skewed to coarse skewed with platykurtic, mesokurtic and leptokurtic characters. Grain characteristics varied spatially and temporally along with beach orientation, foreshore slope withwave action and skewness correlates with shoreline changes. In some coastal tract having the negative skewness along the study region, but not very significant. The study depicts that the sedimentary coastal environment were influenced by the relatively medium wave action and some places were observed high wave action. From this study, it was concluded that the beach erosion, accretion, and stability of beaches are controlled by strong hydrodynamic and hydraulic process.
Textural characterization of coastal sediments along udupi coast, west coast of india
2016
Particle size characterizations of beach sediments along Tamil Nadu coast was carried out in the present study. The main objective of this work is to identify the textural behaviour of beach sediments and how wave energy correlates with grain size distribution.To achieve this goal tri-plot analysis was performed. Grain size characteristics such as central tendency, kurtosis and skewness were estimated using an updated version of the GRADISTAT programme and discussed in this paper. The highest sediment samples having medium sand with unimodal and bimodal characters at all along the coast. The entire coastal area was characterized as well sorted, moderately well sorted and moderately sorted sediment environments. Sediments were identified as fine skewed to coarse skewed with platykurtic, mesokurtic and leptokurtic characters. Grain characteristics varied spatially and temporally along with beach orientation, foreshore slope withwave action and skewness correlates with shoreline changes. In some coastal tract having the negative skewness along the study region, but not very significant. The study depicts that the sedimentary coastal environment were influenced by the relatively medium wave action and some places were observed high wave action. From this study, it was concluded that the beach erosion, accretion, and stability of beaches are controlled by strong hydrodynamic and hydraulic process.
Textural Analysis of Coastal Sediments along East Coast of India
Journal of the Geological Society of India, 2020
The study investigates textural characteristics of sediment at selected tourist beaches extending from Rameswaram to Paradip along east coast of India. Samples were taken from backshore and foreshore at nine selected locations to evaluate sediment grain size distribution and its seasonality. Analysis of grain size distribution carried out to identify textural characteristics (mean size, standard deviation, skewness and kurtosis) and its variability in two different seasons (southwest and northeast monsoon). Results show that sediments lying in backshore regions are mostly medium sand, while its changes are relatively invariant against seasons. The percentage of fine sand is higher during January compared to September due to prevalence of calm wave conditions. The mean grain size trend decreases at backshore region while it increases at foreshore region from south to north along the coast indicating dominance of aeolian transport. Sediments are mostly moderately sorted at backshore and moderately well sorted at foreshore region. Mostly symmetrical and mesokurtic sediments are dominated along the coast indicating sediments are well sorted at central portion of sediment distribution. The CM diagram depicts sediment source are from beach environment during both the seasons and some of them transported by tractive current in September and transporting during September is by rolling, bottom suspension and rolling; and graded suspension no rolling.
Integrated offshore investigations along selected segments off East Coast of India for port and harbors developmental activities have provided detailed information on the sea floor morphology and sediment characteristics. The data permits comparative evaluation of the region from northern parts to southern parts. The eastern continental margin of India is flanked by a narrow zone of onshore, offshore sedimentary basins with a sediment fill ranging from Early to Late Holocene. There are variations in sediment nature and geotechnical characteristics along the near shore sector of the east coast. An attempt is made to compare the geotechnical characteristics of the sediments in the near shore sector of the east coast along Andhra Pradesh and Pondicherry coasts. Detailed studies at port areas have been carried out by the East Coast Operations, Marine Wing, GSI, Visakhapatnam at selected sectors along the Andhra Pradesh and Pondicherry coasts for their development and also on case specific studies for single buoy mooring etc.
Indian Journal of Geo Marine Science, 2017
Sediments are mainly medium to fine grained, moderately well sorted to moderately sorted, near symmetrical to very coarse skewed and mesokurtic to leptokurtic nature based on granulometric study. Interrelationship of various parameters shows bimodal nature of sediments. Linear discriminant analysis (LDA) of all the samples indicate aeolian, under a beach process in shallow marine condition and deposited under turbidity environment. CM and Tractive current diagram infers that sediments were deposited bottom suspension and rolling. Significance of the present study is mainly focused on grain size distribution, depositional process, environments and energy conditions of the core sediments.
SEASONAL VARIABILITY IN SEDIMENT DISTRIBUTION ALONG THE SOUTHWEST COAST OF TAMIL NADU, INDIA
Sedimentological studies have been used to decipher the provenance of the sediment samples. Granulometric analysis of sediments in the region from Kanyakumari coast, eight sandy beaches have been selected and studied for analyzing the textural parameters namely mean, sorting, skewness, and kurtosis. Abundance of medium sand and low fine sand deposits prevails in postmonsoon, summer and SW monsoon seasons, only medium sand deposits are available in NE monsoon. The presence of medium sand indicates that the deposition might have been formed under a high-energy condition and fine sands correspond to moderately low-energy conditions. The Linear Discriminant Functions of the sediment samples (Y1, Y2 and Y3) indicate beach, shallow agitated, and fully shallow marine environment in the coast and less influence of aeolian, beach process in all the seasons. Bivariate plot means vs standard deviation and sorting vs skewness show that majority of the samples fall in beach environment and few samples fall in riverine environments. CM diagram of SW coast sediments implies that overall deposition takes place by optimum grain size for the rolling process sector. The seasonal wave response associated with grain size variation clearly reflects the predominant transport rate higher in SW monsoon than the rest of the period. The post monsoon and summer season have the similar characteristics of the sediment origination. On the other side, SW monsoon and NE monsoon have akin relationship one among the others. The results show that seasonal action implies sediment dynamics except in Kanyakumari, and Kadiapattinam due to the presence of rocky cliffs, estuaries and anthropogenic activities. The present work provides an insight on the depositional feature of sediment in selected stations of the SW coast, India.
Textural characteristics of beach sediments along Kalpakkam, south east coast of India
2017
Samples collected from foreshore region showed more variations in grain size as compared to mid-shore region samples. Median values varied from-0.08ø to 2.19 ø with an average of 1.04 ø (Std ± 0.65 ø). Mean value showed that samples were fine to coarse sand, whereas, only 1.8% of total samples were found as very coarse sand. During southwest monsoon the average mean size of the beach sediment was 0.98 ø, which is coarse sand in contrast to the medium sand observed during other seasons. Present study showed that, 81.7% of the samples were unimodal and 17.8% samples were bimodal. Sediment samples were very well sorted (0.18 ø) to poorly sorted (1.18 ø) and sorting characteristics decreased with increased wave energy. Skewness value indicated that 41% & 11% of the samples were positively skewed and negative skewed respectively, whereas, rest of the samples were symmetrical. All the beaches were dominated by mesokurtic sediment. Dominance of positively skewed sediment in the study area indicated the prevalence of low wave activity and longshore current. Presence of relatively high fraction of mesokurtic sediment indicated that the beaches along Kalpakkam by and large have uniform energy environment.
International Research Journal of Engineering and Technology, 2015
Grain size and depositional pattern of sediment from Arasalar river mouth (ARM North and ARM South) in Karaikal region of Pondicherry Union territory and Southern part of Tamil Nadu have been carried to using the textural parameters. The samples were processed and sieved following standard procedures. Textural parameter like mean, standard deviation, skewness and kurtosis are calculated using standard methods to understand the transportation and the depositional environment of the sediments. Statistical parameters revealed that sediments are dominant in fine sand category, moderately well sorted, fine skewed to near symmetrical and falls under mesokurtic to platykurtic character. Linear discriminate function (LDF) value indicates that sediments deposited under aeolian and shallow agitated water process under Sh Marine and turbidity environment of the basin. CM diagram (C = one percentile in microns, M = medium in microns) of ARMN and ARMS sediments suggests that deposition was dominantly by bottom suspension and rolling.
The granulometric studies of vertical sediments are generally reveals medium to fine grained nature of sediments. The standard deviation (δ1) indicates that the samples are well sorted nature. The graphic skewness (ski) indicates that they are near symmetrical and fine skewed. The kurtosis (Kg) values of the sediments vary in leptokurtic nature. All the samples show marginal marine conditions. During this period the sediments were deposited predominantly by Aeolian and beach process under shallow agitating environment and carried by turbidity action. Scanning microscopy of quartz grain size analysis and textural parameters along the Gadilam and Ponnaiyar River reveals of some micro features. There are three types of process environments viz. Beach (Littoral), subaqueous and low to high energy environments appear to be active the east coast of Tamilnadu. The significance of the present study is mainly focused on vertical size distribution, depositional process, environments and energy conditions of the deposits and morphological studies of quartz. Keywords: Beach Sediments, Grain size, SEM, Ponnaiyar, Gadilam.