Mangroves are believed to stabilize the coastlines by controlling erosion and facilitating sediment deposition. Coastal managers often plant mangroves to counter coastal erosion. The state of Gujarat in West India has planted thousands of hectares of mangroves over the years, and control of coastal erosion has been one of the prime reasons of plantation. This study performed a statistical assessment of the effect of the planted mangroves on the coastline changes in the state from 1990 to 2013. The study utilized geographic information system and remote sensing data to demarcate the areas under erosion and accretion during this period, and then compared these changes with the change in mangrove cover using statistical models. This cross-sectional analysis was conducted at the level of a tehsil, an administrative unit below a district. The results show that mangrove plantation did not decrease erosion, not even after normalizing the coastline changes by the length of the coastline and using controls for physical and anthropogenic features of the tehsils. Tehsils with increased mangrove cover witnessed both increased erosion and accretion, although the latter was much higher. The geophysical features of the area appeared to be the main determinants of coastline changes in Gujarat.

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红树林种植会减少海岸侵蚀吗？来自印度西海岸的评估

据认为，红树林通过控制侵蚀和促进沉积物沉积来稳定海岸线。沿海管理者经常种植红树林来应对海岸侵蚀。多年来，印度西部的古吉拉特邦已经种植了数千公顷的红树林，控制海岸侵蚀一直是人工种植的主要原因之一。这项研究对1990年至2013年该州人工种植的红树林对海岸线变化的影响进行了统计评估。该研究利用地理信息系统和遥感数据划定了此期间的侵蚀和增生区域，然后进行了比较使用统计模型，这些变化将随着红树林覆盖率的变化而变化。横截面分析是在tehsil水平进行的，是区下的行政单位。结果表明，红树林种植园并没有减少侵蚀，甚至没有在海岸线长度标准化海岸线的变化，并使用控制为物理的和人为的特点后tehsils。尽管红树林覆盖率更高，但红树林覆盖率较高的Tehsils的侵蚀和增生均有所增加。该地区的地球物理特征似乎是古吉拉特邦海岸线变化的主要决定因素。