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Nearshore sediment dynamics of Kavaratti Island, Lakshadweep archipelago using integrated modelling system
Indian Journal of Geo-Marine Sciences ( IF 0.5 ) Pub Date : 2020-07-23
T P S Jinoj, S R Bonthu, R S Robin, K K Idrees Babu, R Purvaja, R Ramesh

The Kavaratti Island of Lakshadweep archipelago exhibits high coastal erosion and shoreline changes due to the anthropogenic stresses on the island morphology. This study focuses on the shoreline analysis using Digital Shoreline Analysis System model and nearshore sediment dynamics using an integrated modeling system with high resolution bathymetry of ~15 m. The sediment load and bed level change were estimated using the sediment transport model through the feedback mechanism of flow and wave forces. The model simulations were performed during winter, pre-monsoon, monsoon and post-monsoon seasons for the year 2015 and calibrated using the field observation datasets. Shoreline change studies indicate the coastal erosion of about 83.43 % and accretion of about 16.55 % along the island coast. The study signifies the erosion around the fishing jetty and accretion at the western (Katchery) jetty due to wave induced currents and tidal influx. The scouring effect due to the presence of tetrapods along the island coast is observed between 0.02 and 0.18 m.

中文翻译:

集成建模系统在拉克沙德普群岛的卡瓦拉蒂岛近岸沉积动力学

Lakshadweep群岛的卡瓦拉蒂岛由于人为因素对岛屿形态的胁迫而表现出高海岸侵蚀和海岸线变化。这项研究的重点是使用数字海岸线分析系统模型进行的海岸线分析,以及使用分辨率约为15 m的高分辨率测深的集成建模系统进行的近岸沉积物动力学分析。利用泥沙运移模型,通过水流和波浪力的反馈机制,估算了泥沙负荷和床位变化。在2015年冬季,季风前,季风和季风后季节进行了模型模拟,并使用现场观测数据集进行了校准。海岸线变化研究表明,沿岛海岸的海岸侵蚀约为83.43%,积聚约为16.55%。该研究表明,由于波浪引起的潮流和潮汐涌入,导致渔业码头周围的侵蚀和西部(Katchery)码头的增生。观察到由于沿岛海岸存在四足动物而产生的冲刷作用在0.02至0.18 m之间。
更新日期:2020-07-28
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