当前位置: X-MOL 学术Ecohydrol. Hydrobiol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effect of hydrodynamic conditions on seagrass ecosystems during Cyclone Lehar in the South Andaman Islands, India
Ecohydrology & Hydrobiology ( IF 2.6 ) Pub Date : 2022-08-04 , DOI: 10.1016/j.ecohyd.2022.07.006
V. Sachithanandam , Subbareddy Bonthu , T. Mageswaran , K.S. Singh , J. Vimala , R. Sridhar , R. Purvaja , R. Ramesh

The physical disturbances of hydrodynamic conditions in shaping the seagrass meadows were studied in the vicinity of seagrass meadows over the south of Port Blair in the Andaman and Nicobar Islands (ANI) during the lifetime of Cyclone Lehar using spatial and temporal metrological - oceanic parameters and in-situ measurements. A cyclonic depression formed on 23 November 2013 over the west coast of the Malay Peninsula and then transformed into a severe cyclone named Lehar on 25th November 2013. It made its first landfall south of Port Blair in the ANI and caused extensive damage to life and properties. The present study made an attempt to investigate the hydrodynamic condition and their impact on the seagrass meadows during the lifetime of the cyclone. The results revealed that the floristic composition of seagrass species such as Thalassia hemperichii, Halodule pinnifolia and Halodule uninervis was badly damaged due to the effect of the high gradient of velocities in the vertical direction, turbulence, high energetic waves, and storm surge. Approximately 32.4% of the seagrass meadows were uprooted in Haddo Bay and 68% in Sesostris Bay of the South Andaman Islands. A year after the cyclone passage (December 2014), 13% (∼0.70 ha) of the seagrass meadow in Haddo Bay and 44.5% (∼0.30 ha) of the seagrass in Sesostris Bay had recovered. This study emphasises that the morphometric features of the most dominant species, T. hemperichii, were regulated by the physical hydrodynamic mechanisms and led to substantial destruction in the study sites. This study is very useful to understand the impact of hydrodynamic conditions on seagrass ecosystems during a cyclone and brings attention to the real-time monitoring of seagrass ecosystems. Monitoring of the seagrass ecosystem can be further improved by predicting the behavioural dynamics of the marine ecosystem under the various scenarios of extreme weather conditions using high-resolution numerical models. It also helps to determine the appropriate management policy during extreme natural events.



中文翻译:

印度南安达曼群岛莱哈尔飓风期间水动力条件对海草生态系统的影响

使用空间和时间计量 - 海洋参数现场测量。2013 年 11 月 23 日在马来半岛西海岸形成气旋低气压,然后于 25日转变为名为 Lehar 的强气旋。2013 年 11 月。它在 ANI 的布莱尔港以南首次登陆,并对生命和财产造成了广泛破坏。本研究试图调查气旋生命周期内的水动力条件及其对海草草地的影响。结果表明,海草物种的植物区系组成,如Thalassia hemperichii、Halodule pinnifoliaHalodule uninervis由于垂直方向上的高速度梯度、湍流、高能波和风暴潮的影响,它被严重破坏。大约 32.4% 的海草草地在哈多湾被连根拔起,68% 在南安达曼群岛的塞索斯特里斯湾被连根拔起。气旋通过一年后(2014 年 12 月),哈多湾 13%(~0.70 公顷)的海草草甸和塞索斯特里斯湾 44.5%(~0.30 公顷)的海草已经恢复。这项研究强调了最主要的物种T. hemperichii 的形态特征,受到物理流体动力学机制的调节,并导致研究地点的大量破坏。这项研究对于了解气旋期间水动力条件对海草生态系统的影响非常有用,并引起人们对海草生态系统的实时监测的关注。通过使用高分辨率数值模型预测极端天气条件下各种情景下海洋生态系统的行为动态,可以进一步改进对海草生态系统的监测。它还有助于在极端自然事件期间确定适当的管理政策。

更新日期:2022-08-04
down
wechat
bug