Textural characterization of coastal sediments along udupi coast, west coast of india (original) (raw)
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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 characteristics of foreshore sediments along Karnataka shoreline, west coast of India
International Journal of Sediment Research, 2011
Grain character analysis of beach sediments along three selected beaches (Pavinkurve, Kundapura and Padukare) of Karnataka coast, west coast of India is carried out in the present study. The objective was to identify the textural behavior of beach sediments during an annual cycle from March 2008 to February 2009. Grain characteristics such as central tendency, sorting, kurtosis and skewness were estimated using GRADISTAT and discussed. The maximum (62%) sediment samples were medium sand with unimodal and bimodal characters at all the three beaches. The median values varied in between-0.04? and 2.74? with an average value of 1.61?. The beaches were 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 and wave action. A negative correlation between mean and sorting is identified for maximum number samples along the study region but not very significant. The study shows that the sedimentary environment at Kundapura were influenced by relatively high wave action compared to Padukare and Pavinkurve beach and the beaches were under erosion or non-deposition with strong winnowing 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.
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 Journal of Recent Development in Engineering and Technology, 2019
Abstract-- The present research has been discussed on the sediment textural characteristics of the coastal beach. Sediment plays a role of document landform formation. Various statistical parameters such as Graphical Mean Grain Size (Mz), Standard Deviation (σ1), Skewness (Sk) and Kurtosis (kG) are used to evacuate the aforesaid concern. The mean grain size (Mz) is being used to find out the dominance grain size. Standard deviation (σ1) shows the sorting nature of soil or sediment. Skewness (Sk) measures the costiveness of skewed and also kurtosis (kG) quantifies the sediments nature are mesokurtic to very leptokurtic. In addition, Linear Discriminant Analysis (LDA) is used to analyse the environment of deposition. Keyword: Coastal Beach, Mean Grain Size, Standard Deviation, Skewness, Kurtosis, Linear Discriminant Analysis.
International Journal of Sediment Research, Elsevier
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. 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 the sediments discharged from the river mixes with offshore sediments and with the sediments eroded from a source rock. The effect of wave sorting, and the northward drifting of sediments by littoral current are understandable. Results indicate that the Tirumalairajanar River is the most important source for modern sediments in the study area. The agitation by 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.
Seasonal Variation of Beach Sediment Dynamics of the Coleroon Coast, Tamil Nadu, India
International Journal of Earth Sciences and Engineering
The present study was carried out in order to study about the textural characteristics of sediments, and their seasonal changes along the coast of Coleroon. Samplings were done at different station during two seasons from monsoon 2009 to postmonsoon 2010. Granulometric studies reveals that the grain size parameters at different beach locations do not suggest a general trend of longshore variations, except on the beach close to the river mouth. The differences between the seasons were larger than those between the geomorphological units. During the monsoon the mean size was medium, sorting was worse and the distribution was more positively skewed. The major part of the sediment fall in a medium to fine grained category.
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.
Sediment Texture and Geochemistry of Beaches between Redi-Vengurla, Sindhudurg, West Coast of India
Journal of Coastal Research, 2017
Textural and geochemical determinations were carried out on three beaches (Vengurla, Aravali, and Redi) of the Sindhudurg district, Maharashtra, west coast of India. Seasonal sediments from the beach were collected during 2003-04 to understand the sediment dynamics (texture, dispersal pattern, depositional environment, etc.) and geochemical characteristics. In general, a seaward grain size fining is seen along Vengurla beach (swash-backwash phenomenon), with a coarsening seaward trend along Aravali and Redi beaches (high-energy conditions). The CM pattern studies reveal traction currents as the transport mechanism. Thus, the sediments of the study area are deposited under moderate to high-energy conditions. The geochemical study shows that the percentages of V, Cr, and Zr are greater in
Seasonal (post-and pre-monsoon) changes in texture and environment of deposition of beach sediments of Karnataka coast have been studied using various statistical parameters (Mean size, Standard deviation, Skewness and Kurtosis). These parameters were obtained for all the sieved sediment samples (68 for each season), using Gradistat V8.0 and G-Stat software packages. Based on the range of variability of these statistical parameters, the studied coast has been divided into four sectors. Sector I extends from Talapady to Surathkal; sector II includes beaches from Mukka to Kota. Sector III comprises Marvanthe and Nesther beaches and those lying between Murdeshwara and Devbagh fall in sector IV.Passega's CM and Tractive current diagrams were prepared to understand the energy condition of depositional currents and mode of transportation of sediment respectively. Linear Discriminant Function (LDF) plots were used to understand the environment of deposition of sediments. TheCM diagram reveals predominance of beach and tractive currentconditions along the entire coast. The Tractive current diagram indicates that deposition of sediment takes place by rolling and bottom suspension during post-monsoon, whereas by graded suspension and no rolling conditions during pre-monsoon season in sector I. In sector II, deposition of sediment takes place by bottom suspension and rolling during both the seasons. In sector III, the sediments show change in energy conditions with time where they are deposited by rolling during post-monsoon, whereas prevailing of low energy condition during pre-monsoon season as deposition of sediment takes place by bottom suspension and rolling. In sector IV, bottom and graded suspensions have been the dominant mode of deposition during both the seasons. The LDF analysis of sediment samples indicates dominance of shallow marine environment of deposition for both the seasons. The LDF plotsreveal that sector I predominantly belongs to beach shallow to beach littoral environment for both the seasons. Shallow marine agitated environment of deposition was observed for the postmonsoon season in sector II, while increase in energy conditions at this sector led tobeach shallow environment of deposition during the pre-monsoon season. Sector III shows predominance of beach littoral environment of deposition for the post-monsoon, while beach shallow environment of deposition during the pre-monsoon indicating decrease in energy conditions. Sector IV plots show little or no change for both the seasons and the samples predominantly fall in shallow marine agitated environment of deposition.