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Papers by felix giatama

Research paper thumbnail of SEDIMENT CHARACTERIZATION AND DEPOSITIONAL PROCESSES FROM THE PIT SAMPLES OF POOMPUHAR, AMBANAR RIVER MOUTH AND TARANGAMBADI, EAST COAST OF TAMILNADU, INDIA

The successive phases of marine transgression and regression, the aeolian, fluvial and beach proc... more The successive phases of marine transgression and regression, the aeolian, fluvial and beach processes are considered to be responsible for the varied nature of landscape of the coastal belt of Tamilnadu. The nature of sediments deposited are mainly a function of the type of coast, coastal morphology as well as the energy condition and energy fluctuations through space and time under which it has been deposited. Granulometric studies of the vertical pit samples reveals that in the Poompuhar region there is predominance of moderately well sorted fine sand. The sediments of Ambanar River Mouth region showed predominant fine sand, with predominant very well sorted to well sorted sediments. The skewness value shows that samples are mostly nearly symmetrical. The samples are mesokurtic to platykurtic in nature of distribution. In Tarangambadi region predominance of fine sand, exhibits moderately well sorted to well sorted sediments. Sediments are coarse skewed to near symmetrical and are leptokurtic to mesokurtic. Sediments at Poompuhar exhibit shallow marine condition in a fluvial/deltaic environment deposited under aeolian processes. But the sediments at Tarangambadi and Ambanar River Mouth exhibit aeolian/ beach processes under shallow marine turbid environment. .

Research paper thumbnail of The contribution of the Passega method and the use of the sedimentological indicators (Folk and Ward), as an evaluation tool of the Holocene depositional environment of Kifissos river, Athens, Greece

This research concerns the evaluation of the depositional environment in Kifissos river, in N. fa... more This research concerns the evaluation of the depositional environment in Kifissos river, in N. faliro area (Greece). In order to retrieve the depositional history ten sampling boreholes (P1-P10) are made in the area of Piraeus-N. Faliro in 2005 from the coordination of EFA (and the director of the ARTEMIS-SHS. Only two boreholes (P2-P4) were selected for further sedimentological analysis as the most representative. After the description of its stratigraphic units, sampling had been followed. Forty samples were collected and they were sedimentologically and granulometrically studied through the laser granulometer Mastersizser 2000 of the Malvern Company. The available obtained data were statistically analysed through the program "Gradistat" to collect the appropriate results for the Passega method and the sedimentological indicators method (Folk and Ward).

Research paper thumbnail of Seasonal Variation in Textural Characteristics and Sedimentary Environments of Beach Sediments, Karnataka Coast, India

Seasonal (post-and pre-monsoon) changes in texture and environment of deposition of beach sedimen... more 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.

Research paper thumbnail of SEDIMENT CHARACTERIZATION AND DEPOSITIONAL PROCESSES FROM THE PIT SAMPLES OF POOMPUHAR, AMBANAR RIVER MOUTH AND TARANGAMBADI, EAST COAST OF TAMILNADU, INDIA

The successive phases of marine transgression and regression, the aeolian, fluvial and beach proc... more The successive phases of marine transgression and regression, the aeolian, fluvial and beach processes are considered to be responsible for the varied nature of landscape of the coastal belt of Tamilnadu. The nature of sediments deposited are mainly a function of the type of coast, coastal morphology as well as the energy condition and energy fluctuations through space and time under which it has been deposited. Granulometric studies of the vertical pit samples reveals that in the Poompuhar region there is predominance of moderately well sorted fine sand. The sediments of Ambanar River Mouth region showed predominant fine sand, with predominant very well sorted to well sorted sediments. The skewness value shows that samples are mostly nearly symmetrical. The samples are mesokurtic to platykurtic in nature of distribution. In Tarangambadi region predominance of fine sand, exhibits moderately well sorted to well sorted sediments. Sediments are coarse skewed to near symmetrical and are leptokurtic to mesokurtic. Sediments at Poompuhar exhibit shallow marine condition in a fluvial/deltaic environment deposited under aeolian processes. But the sediments at Tarangambadi and Ambanar River Mouth exhibit aeolian/ beach processes under shallow marine turbid environment. .

Research paper thumbnail of The contribution of the Passega method and the use of the sedimentological indicators (Folk and Ward), as an evaluation tool of the Holocene depositional environment of Kifissos river, Athens, Greece

This research concerns the evaluation of the depositional environment in Kifissos river, in N. fa... more This research concerns the evaluation of the depositional environment in Kifissos river, in N. faliro area (Greece). In order to retrieve the depositional history ten sampling boreholes (P1-P10) are made in the area of Piraeus-N. Faliro in 2005 from the coordination of EFA (and the director of the ARTEMIS-SHS. Only two boreholes (P2-P4) were selected for further sedimentological analysis as the most representative. After the description of its stratigraphic units, sampling had been followed. Forty samples were collected and they were sedimentologically and granulometrically studied through the laser granulometer Mastersizser 2000 of the Malvern Company. The available obtained data were statistically analysed through the program "Gradistat" to collect the appropriate results for the Passega method and the sedimentological indicators method (Folk and Ward).

Research paper thumbnail of Seasonal Variation in Textural Characteristics and Sedimentary Environments of Beach Sediments, Karnataka Coast, India

Seasonal (post-and pre-monsoon) changes in texture and environment of deposition of beach sedimen... more 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.

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