Landfall season is critical to the impact of a cyclone on a monsoon-regulated tropical coastal lagoon

2021 ◽  
Vol 770 ◽  
pp. 145235
Author(s):  
Deepak R. Mishra ◽  
Abhishek Kumar ◽  
Pradipta R. Muduli ◽  
Tamoghna Acharyya ◽  
Prasannajit Acharya ◽  
...  
Keyword(s):  
Coastal Lagoon ◽  
Tropical Coastal Lagoon ◽  
The Impact

scholarly journals Extreme Meteorological Events in a Coastal Lagoon Ecosystem: The Ria de Aveiro Lagoon (Portugal) Case Study

2021 ◽  
Vol 9 (7) ◽  
pp. 727
Author(s):  
José Fortes Lopes ◽  
Carina Lurdes Lopes ◽  
João Miguel Dias
Keyword(s):  
Water Temperature ◽  
Coastal Lagoon ◽  
Early Summer ◽  
Extreme Weather Events ◽  
Climate Change Scenarios ◽  
State Variables ◽  
Ria De Aveiro ◽  
Physical Conditions ◽  
Weather Events ◽  
The Impact

Extreme weather events (EWEs) represent meteorological hazards for coastal lagoon hydrodynamics, of which intensity and frequency are increasing over the last decades as a consequence of climate changes. The imbalances they generated should affect primarily vulnerable low-lying areas while potentially disturbing the physical balances (salt and water temperature) and, therefore, the ecosystem equilibrium. This study arises from the need to assess the impact of EWEs on the Ria de Aveiro, a lagoon situated in the Portuguese coastal area. Furthermore, it was considered that those events occur under the frame of a future sea-level rise, as predicted by several climate change scenarios. Two EWEs scenarios, a dry and an extremely wet early summer reflecting past situations and likely to occur in the future, were considered to assess the departure from the system baseline functioning. It was used as a biogeochemistry model that simulates the hydrodynamics, as well as the baseline physical and biogeochemistry state variables. The dry summer scenario, corresponding to a significant reduction in the river’s inflow, evidences a shift of the system to a situation under oceanic dominance characterized by colder and saltier water (~18 °C; 34 PSU) than the baseline while lowering the concentration of the nutrients and reducing the phytoplankton population to a low-level limit. Under a wet summer scenario, the lagoon shifted to a brackish and warmer situation (~21 °C, <15 PSU) in a time scale of some tidal periods, driven by the combining effect of the tidal transport and the river’s inflow. Phytoplankton patterns respond to variability on local and short-term scales that reflect physical conditions within the lagoon, inducing nutrient-supported growth. Overall, the results indicate that EWEs generate local and transient changes in physical conditions (namely salinity and water temperature) in response to the characteristic variability of the lagoon’s hydrodynamics associated with a tidal-dominated system. Therefore, in addition to the potential impact of changing physical conditions on the ecosystem, saline intrusion along the lagoon or the transfer of brackish water to the mouth of the system are the main consequences of EWEs, while the main biogeochemistry changes tend to remain moderate.

Consequences of sea level and climate changes on the morphodynamics of a tropical coastal lagoon during Holocene: An evolutionary model

2014 ◽  
Vol 333 ◽  
pp. 156-172 ◽  
Author(s):  
D. Padmalal ◽  
K.P.N. Kumaran ◽  
K.M. Nair ◽  
Ruta B. Limaye ◽  
S. Vishnu Mohan ◽  
...  
Keyword(s):  
Sea Level ◽  
Coastal Lagoon ◽  
Climate Changes ◽  
Evolutionary Model ◽  
Tropical Coastal Lagoon

Accumulation of conservative substances in a sub-tropical coastal lagoon

2015 ◽  
Vol 164 ◽  
pp. 1-9 ◽  
Author(s):  
J.G. Cardoso-Mohedano ◽  
R. Bernardello ◽  
J.A. Sanchez-Cabeza ◽  
E. Molino-Minero-Re ◽  
A.C. Ruiz-Fernández ◽  
...  
Keyword(s):  
Coastal Lagoon ◽  
Tropical Coastal Lagoon

Hydrographic Processes in a Tropical Coastal Lagoon on Western Bay of Bengal

2021 ◽  
Author(s):  
Rabindra Kumar Sahoo ◽  
Sourav Sil ◽  
Samiran Mandal ◽  
Subhasis Pradhan ◽  
Sanjiba Kumar Baliarsingh ◽  
...  
Keyword(s):  
Central Region ◽  
Coastal Lagoon ◽  
Bay Of Bengal ◽  
Saline Water ◽  
Western Boundary ◽  
Chilika Lagoon ◽  
Thermal Inversion ◽  
Tropical Coastal Lagoon ◽  
Lagoon Environment ◽  
Vertical Variability

Abstract In this article, hydrographic processes of a tropical coastal lagoon is studied that control inherent biological mechanisms of the lagoon environment. Realizing the interest of environmentalists over physio-chemical studies of a wetland tropical wetland system on the western boundary of the Bay of Bengal, a high-resolution intensive vertical hydrographic field campaign was carried during monsoon to uncover peculiarity in vertical hydrographic processes that was long-awaited to address many environmental issues. Vertical hydrographic profiles on spatio-temporal scale were made at nine stations in a zonal direction of the Chilika lagoon system. Results of vertical variability of salinity showed the presence of higher saline water over less saline water in the central-western region. The higher and lower water temperature in the western and eastern parts of the lagoon, respectively, indicated temperature dipole between the two regions. The encapsulation of water mass having higher temperature by the water of lower temperature at the central region resulted evolution of thermal inversion. The highest dissolved oxygen concentration was observed in the sub-surface layers of the western part of the lagoon. However, a layer of near-hypoxia occurred below 1.5 m depth in the central region. This study proposes comprehensive inter-seasonal studies to address the vertical variability of biogeochemical parameters and the fate of organic flux.

Hypoxia and nutrient dynamics affected by marine aquaculture in a monsoon-regulated tropical coastal lagoon

2018 ◽  
Vol 190 (11) ◽  
Author(s):  
Jing Zhang ◽  
ZhuoYi Zhu ◽  
Wen Yuan Mo ◽  
Su Mei Liu ◽  
Dao Ru Wang ◽  
...  
Keyword(s):  
Coastal Lagoon ◽  
Nutrient Dynamics ◽  
Marine Aquaculture ◽  
Tropical Coastal Lagoon
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