Shoreline change pattern analysis of Nagapattinam coastal stretch, Tamilnadu, India using digital shoreline analysis system (DSAS)

Q4 Engineering

Disaster Advances Pub Date : 2023-11-05 DOI:10.25303/1612da033041

Ramki Periyasamy, Kannan Ganesan, Sajimol Sundar, L. Chokkalingam, Prabhakaran Moorthy

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Abstract

We analysed Nagapattinam coastal zones of southeast coast of India, using Multitemporal satellite images for five equal interval of time period (i.e. 2000, 2005, 2010, 2015, 2020 and 2021). The EPR and LLR methods enumerate the maximum accretion at rates of 22.35, 17.02 m/year and maximum erosion rates of -22.82, -10.84 m/year at the study area coastal stretch. This modification is due to several disasters (like Tsunami, cyclone) and anthropogenic activities (like construction of harbours, excavation of beach sand, industrialisation of garbage dump, urbanisation and discharge of domestic sewage). The Kalman filter model forecasting the shoreline by using statistical analysis shows 242 and 236 m in 2031 and 2041 accretion and erosion of -239 and -226 m in same period. The accretion was mainly observed in Vedaranyam and Thirupoondi and erosion was observed in Tharangambadi, Nagapattinam Poompuhar, Karaikal and Thirumullaivasal region. The outcome of this research ensures to create awareness to protect our shoreline and manage our coastal zones properly with several remedial measures for the future.

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利用数字海岸线分析系统 (DSAS) 分析印度泰米尔纳德邦纳加帕蒂纳姆海岸线变化模式

我们使用多时卫星图像分析了印度东南海岸的纳加帕蒂纳姆沿海地区，这些图像的时间间隔相等（即 2000 年、2005 年、2010 年、2015 年、2020 年和 2021 年）。根据 EPR 和 LLR 方法，研究区域沿海地区的最大增生率分别为 22.35 米/年和 17.02 米/年，最大侵蚀率分别为-22.82 米/年和-10.84 米/年。这种变化是由多种灾害（如海啸、龙卷风）和人为活动（如建造港口、挖掘海沙、工业化垃圾场、城市化和排放生活污水）造成的。卡尔曼滤波模型通过统计分析对海岸线进行预测，结果显示 2031 年和 2041 年海岸线分别增高 242 米和 236 米，同期侵蚀-239 米和-226 米。增生主要发生在 Vedaranyam 和 Thirupoondi，侵蚀主要发生在 Tharangambadi、Nagapattinam Poompuhar、Karaikal 和 Thirumullaivasal 地区。这项研究的成果将有助于提高人们保护海岸线的意识，并在未来采取若干补救措施，妥善管理沿海地区。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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