Comparative study of granulometric and granule trend of pre- and post-tsunami sediments with recent beach sediments from Nagoor to Poompuhar, Tamil Nadu
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引用次数: 0
Abstract
The December 26, 2004 tsunami waves caused significant destruction that changed geomorphic characteristics in India’s east coast. The article presents a comparative study of granulometric and granule trends of pre-tsunami (December, 2004) and post-tsunami (January, 2005) sediments with recent beach sediments (December, 2022) in eight locations, namely, Poompuhar, Chinnankudi, Kuttyandiyur, Chandrapadi, Kottucherimedu, Karaikal Beach, Vadakku Vanjiyur North, and Nagoor Beach. The study was conducted using R Programming and aimed to understand the sediment transport and depositional processes. The textural parameters of the sediments imply that they are becoming relatively finer, stating that the beaches are recovering and reclaiming their regular depositional environment after the disaster. The linear discriminate function plots of pre-tsunami sediments have the highest percentage of aeolian deposits, followed by post-tsunami. The recent sediments have the maximum deposition by the beach environment, and pre-tsunami sediments have the minimal. CM plots show that the transportation of sediments by rolling is more in recent days, whereas sediments were transported by bottom suspension and rolling and by graded suspension in pre- and post-tsunami environments. Further, this study compared sediment roundness between the pre- and post-tsunami periods and the recently deposited sediments. This paper highlights the sediment characteristics observed, especially in the aftermath of natural disasters such as tsunamis.
Research highlights
The study provides valuable insights into the origin of the debris, historical transportation, and depositional activities along the coast.
The study of pre-, post-tsunami and recent beach sediments along the coast from Nagoor to Poompuhar have been done, in which, the sediments have become relatively coarser from pre to post tsunami deposition condition and in recent deposition, the sediments are becoming relatively finer.
The pre-tsunami sediments have the highest percentage of aeolian deposits, followed by post-tsunami. In contrary, recent sediments have the maximum deposition by beach environment.
The transportation of sediments by rolling is more in recent days.
The beaches are recovering and reclaiming their regular depositional environment in recent times after the disaster which is evident by this study.
期刊介绍：
The Journal of Earth System Science, an International Journal, was earlier a part of the Proceedings of the Indian Academy of Sciences – Section A begun in 1934, and later split in 1978 into theme journals. This journal was published as Proceedings – Earth and Planetary Sciences since 1978, and in 2005 was renamed ‘Journal of Earth System Science’.
The journal is highly inter-disciplinary and publishes scholarly research – new data, ideas, and conceptual advances – in Earth System Science. The focus is on the evolution of the Earth as a system: manuscripts describing changes of anthropogenic origin in a limited region are not considered unless they go beyond describing the changes to include an analysis of earth-system processes. The journal''s scope includes the solid earth (geosphere), the atmosphere, the hydrosphere (including cryosphere), and the biosphere; it also addresses related aspects of planetary and space sciences. Contributions pertaining to the Indian sub- continent and the surrounding Indian-Ocean region are particularly welcome. Given that a large number of manuscripts report either observations or model results for a limited domain, manuscripts intended for publication in JESS are expected to fulfill at least one of the following three criteria.
The data should be of relevance and should be of statistically significant size and from a region from where such data are sparse. If the data are from a well-sampled region, the data size should be considerable and advance our knowledge of the region.
A model study is carried out to explain observations reported either in the same manuscript or in the literature.
The analysis, whether of data or with models, is novel and the inferences advance the current knowledge.
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