ABSTRACT

Coringa Mangroves in the Kakinada Bay have evolved as the second-largest mangroves in the East Coast of India over the last century. The Coringa Mangrove shoreline has accreted considerably in the past decades as observed from the satellite imageries, adding value to the natural biodiversity of flora and fauna. This study is focused on quantifying the long term changes of Coringa mangrove shoreline using the Landsat imageries for years 1977, 1988, 2000, and 2013 using the Digital Shoreline Analysis System. For a mangrove shoreline length of 20.5 km, 41 transects were cast at an interval of 500 m for calculating the change and their migration distance using three statistical methods, namely End Point Rate (EPR), Net Shoreline Movement (NSM) and Linear Regression Rate (LRR). Results showed that there was considerable growth of mangroves in the bay leading to the seaward migration of the mangrove shoreline from the year 1977–2013. The study observed the difference in the mangrove shoreline migration dynamics in the South-eastern (near the bottom of the spit) and the western part of the Kakinada Bay. The calculated average degradation rate due to erosion is −5.19 m.yr⁻¹ and the average accretion rate leading to their growth is 14.83 m.yr⁻¹ for all transects of the 20.5 km mangrove shoreline stretch during this period. The results hold importance as they help in identifying the regions prone to mangrove degradation and enable management planning for the protection of the eroding stretch of the mangrove shoreline.

摘要

上个世纪，卡基纳达湾的科林加红树林已发展成为印度东海岸的第二大红树林。从卫星图像观察到，过去几十年里，科林加红树林海岸线已显着增加，为动植物的自然生物多样性增加了价值。本研究的重点是使用数字海岸线分析系统使用 1977 年、1988 年、2000 年和 2013 年的 Landsat 图像来量化 Coringa 红树林海岸线的长期变化。红树林岸线长度为20.5 km，采用端点率（EPR）、岸线净移动（NSM）和线性回归率三种统计方法，以500 m为间隔，选取41条样带，计算其变化及其迁移距离。 (LRR)。结果表明，1977 年至 2013 年间，海湾红树林大量生长，导致红树林海岸线向海迁移。该研究观察了东南部（靠近沙嘴底部）和卡基纳达湾西部的红树林海岸线迁移动态的差异。由于侵蚀计算的平均降解率为 -5.19 m.yr在此期间，对于 20.5 公里红树林海岸线的所有横断面，^-1和导致其增长的平均吸积率为 14.83 m.yr ^{-1 。}结果非常重要，因为它们有助于确定容易发生红树林退化的区域，并为保护红树林海岸线的侵蚀段提供管理规划。