Abstract

Chennai is a major metropolitan city along the southeast coast of India and is popular for its world’s second longest sandy beach called as Marina beach the shoreline of which has been gradually advancing towards the Bay of Bengal over a century. The advance of the shoreline is due to the construction of breakwaters for the formation of the harbor of Chennai port, one of the 12 major ports of India. The study area is the stretch of the shoreline between two zones, viz., Zone I: Cooum (13° 4′ N and 80° 17′ 20″ E) and Zone II: Adyar (13° 0′ 49″ N and 80° 16′ 38″ E). The rate of shoreline change over the period 2000 to 2019 is analysed through statistical parameters using geographical information system and DSAS (digital shoreline analysis system) in the form of erosion and accretion. The LRR results elucidate that the Chennai coast has experienced an extremely dynamic feature with an average erosion rate of −1.67 m/year. The accretion due to the littoral drift with an average rate of +1.31 m/year is driven by the net alongshore current towards the north of the Adyar River.

摘要

钦奈是印度东南沿海的主要大都市，以其世界第二长的沙滩而闻名，被称为滨海海滩，其海岸线在一个多世纪以来逐渐向孟加拉湾推进。海岸线的推进是由于为形成印度12个主要港口之一的钦奈港港口而建造的防波堤。研究区域是两个区域之间的海岸线延伸，即，I 区：Cooum（13° 4' N 和 80° 17' 20" E）和 II 区：Adyar（13° 0' 49" N 和 80 ° 16′ 38″ E)。使用地理信息系统和DSAS（数字海岸线分析系统）以侵蚀和增生的形式通过统计参数分析2000年至2019年期间的海岸线变化率。LRR 结果表明，钦奈海岸经历了极其动态的特征，平均侵蚀率为 -1.67 m/年。由于沿岸漂移的平均速率为 +1.31 m/年，由沿岸净流向 Adyar 河以北的净水流驱动。