Impact of Cyclone Track Features and Tidal Phase Shift upon Surge Characteristics in the Bay of Bengal along the Bangladesh Coast

Hussain, M.; Tajima, Yoshimitsu; Hossain, Mohammed Abed; Das, Partho

doi:10.3390/jmse5040052

Cited by 24 publications

(16 citation statements)

References 41 publications

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“…In the Northern Hemisphere, the right part of the cyclone track (facing in the direction which the cyclone is moving) is called the dangerous semi-circles because of the forward motion of the cyclone, for which onshore winds are observed to the right of the path [76], and higher wind-forcing creates higher surge heights [77].…”

Section: Impact Of Cyclone On Salinity Intrusionmentioning

confidence: 99%

The Dominant Climate Change Event for Salinity Intrusion in the GBM Delta

Akter

Asik

Sakib

et al. 2019

Climate

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Salinity intrusion through the estuaries in low-lying tide-dominated deltas is a serious threat that is expected to worsen in changing climatic conditions. This research makes a comparative analysis on the impact of salinity intrusion due to a reduced upstream discharge, a sea level rise, and cyclonic conditions to find which one of these event dominates the salinity intrusion. A calibrated and validated salinity model (Delft3D) and storm surge model (Delft Dashboard) are used to simulate the surface water salinity for different climatic conditions. Results show that the effects of the reduced upstream discharge, a sea level rise, and cyclones cause different levels of impacts in the Ganges-Brahmaputra-Meghna (GBM) delta along the Bangladesh coast. Reduced upstream discharge causes an increased saltwater intrusion in the entire region. A rising sea level causes increased salinity in the shallower coast. The cyclonic impact on saltwater intrusion is confined within the landfall zone. These outcomes suggest that, for a tide dominated delta, if a sea level rise (SLR) or cyclone occurred, the impact would be conditional and local. However, if the upstream discharge reduces, the impact would be gradual and along the entire coast.

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Section: Impact Of Cyclone On Salinity Intrusionmentioning

confidence: 99%

The Dominant Climate Change Event for Salinity Intrusion in the GBM Delta

Akter

Asik

Sakib

et al. 2019

Climate

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“…Therefore, determining the sensitivity of storm surge to different TC physical parameters is an important step in increasing forecasting accuracy. Previous studies examined the impact on storm surge from changes in TC intensity (Weisberg & Zheng, 2006), size (Irish et al, 2008), forward speed (Hussain et al, 2017;Rego & Li, 2009;Thomas et al, 2019;Weisberg & Zheng, 2006), and location (Fossell et al, 2017;Galarneau et al, 2013). The relationship between storm surge and some of the storm parameters are more straightforward to determine, but others such as the effect of storm translational speed and angle of landfall on storm surge have proven to be more complicated and difficult to assess.…”

Section: Introductionmentioning

confidence: 99%

Impact of Tropical Cyclone Landfall Angle on Storm Surge Along the Mid‐Atlantic Bight

2020

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Storm surge impact depends on coastal geographical and bathymetric features as well as various tropical cyclone characteristics including the size, intensity, and impact angle of the storm. Although the factors contributing to storm surge are well studied, uncertainties remain regarding the level of sensitivity to these parameters. This work seeks to contribute to the current knowledge of storm surge by studying the sensitivity to tropical cyclone landfall angle. We perform an ensemble of synthetic tropical cyclones using a newly developed modeling capability derived from the Weather Research and Forecasting (WRF) model, the Hybrid WRF Cyclone Model. Wind and atmospheric pressure field outputs from 200 synthetic cyclones are used as atmospheric forcing for the Advance Circulation (ADCIRC) model. We study the sensitivity of storm surge offshore extent and inundation to tropical cyclone impact angle. The extent of the impact area around the landfall location is sensitive to the cyclone landfall angle. Cyclones with tracks perpendicular to the coast are shown to produce the highest water levels and broadest inland and offshore extent. Results also indicate a heterogeneity in the sensitivity to landfall angle along the coast, highlighting the importance of both cyclone impact angle and location.

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“…When storm tides are propagated towards the coast, nonlinear effects result in the amplification of harmonics in shallow water [43]. Difference in water level due to the synthetic cyclone and TC Mora is more in Cox's Bazar compared to Chittagong mainly because of the forward motion of the storm where onshore winds are stronger to the right of the cyclone track in the northern hemisphere [44] and close proximity of the location to cyclone landfall [6]. In most of the upazillas the inundation depth due to TC Mora was less than the inundation depth due to the synthetic cyclone.…”

Section: Resultsmentioning

confidence: 99%

“…The range of astronomical tide along the coast of Bangladesh is so large that the storm-induced sea level is apt to become very high [6].…”

Section: Introductionmentioning

confidence: 99%

“…Surge peak in Meghna estuary is most likely to occur at the high tidal water [8,10,22]. During the low tide along the coast, the speed of surge propagation is substantially slower compared with the high tide due to the combined effect of shallow water depth and bottom friction [6]. As in terms of tide surge dependency, timing of the tidal peak is one of the important factors for surge height.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Tidal Phase on Inundation and Thrust Force Due to Storm Surge

Azad¹,

Mita²,

Zaman³

et al. 2018

JMSE

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Impact of storm surge largely varies depending on the tidal phase during the landfall of a tropical cyclone. This study investigates comparative variance in inundation condition and thrust force for an identical cyclone during low tide and high tide by applying a numerical model (Delft3D) and a semi-analytical model (DFM). A moderate strength cyclone, Mora, which made landfall on Bangladesh coast in May 2017 is selected to study its impact on land during low tide and high tide. Actual landfall time of Mora was during low tide. To study the impact of storm surge during high tide, a synthetic cyclone is created which has similar strength and track to that of Mora but makes landfall during high tide. The results show that inundation depth, inundation extent, and thrust force increase when a cyclone makes landfall during high tide compared to the condition when the cyclone makes landfall during low tide. But the relation between storm surge impact and tidal phase is not linear. It depends on the land topography of the location, direction of cyclone movement, direction and magnitude of water velocity and wind velocity, gradients of water surface and wind velocity, and proximity and position of the location with respect to cyclone track.

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Impact of Cyclone Track Features and Tidal Phase Shift upon Surge Characteristics in the Bay of Bengal along the Bangladesh Coast

Cited by 24 publications

References 41 publications

The Dominant Climate Change Event for Salinity Intrusion in the GBM Delta

The Dominant Climate Change Event for Salinity Intrusion in the GBM Delta

Impact of Tropical Cyclone Landfall Angle on Storm Surge Along the Mid‐Atlantic Bight

Impact of Tidal Phase on Inundation and Thrust Force Due to Storm Surge

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