Comparing second-order hazard estimates based on historical and synthetic tracks show that, for this case study, the use of historical tracks (a deterministic approach) leads to an underestimation of the mean computed storm surge up to −30 %. The estimates of the extreme values derived for wind speed, wave height and storm surge are shown to converge within the 1,000 years of simulated cyclone tracks. Based on estimated wind fields, second-order hazards (i.e. wind speed) compared to the statistics derived for historical tropical cyclones. It is shown that the use of synthetic tracks provides reliable estimates of the statistics of the first-order hazard (i.e. Each of these realizations is used to force coupled storm surge and wave simulations by means of the processed-based Delft3D Flexible Mesh Suite. In this paper, this challenge is overcome by using synthetic tropical cyclone tracks and wind fields generated by the open source tool TCWiSE (Tropical Cyclone Wind Statistical Estimation), to create thousands of realizations representative for 1,000 years of tropical cyclone activity for the Bay of Bengal. Tropical cyclone geometry and wind speeds have been recorded for the past few decades only, therefore resulting in poorly reliable estimates of the extremes, especially at regions characterized by a low number of past tropical cyclone events. Deriving reliable estimates of design water levels and wave conditions resulting from tropical cyclones is a challenging problem of high relevance for, among others, coastal and offshore engineering projects and risk assessment studies. “We are working under extremely tough conditions and amid Covid related restrictions to restore connectivity,” said a Vodafone Idea official.Abstract. Dua of the Tower and Infrastructure Providers Association. We have also requested DoT to help us with availability of diesel in some areas like North and South 24-Parganas, Howrah and East Midnapore,” said T.R. Diesel gensets, batteries and field rescue teams are kept in readiness. But it will take a while for electricity to get stable. “As of now, the situation of power supply in Calcutta has improved. Moreover, there is network disruption on account of fibre cuts and certain areas are still inaccessible,” said Rajan Mathews, director general of the COAI (Cellular Operators Association of India).Ī Dover Terrace resident asked: “Why should wireless connection be so paralysed? Is it because the telcos don’t spend enough on building infrastructure?” Even if the network goes up to 95 per cent, with erratic power supply the problem persists. But erratic power supply is still a problem. DoT (Department of Telecommunication) has been informed that by tomorrow it will improve to 90-95 per cent. “Network is back at about 80-85 per cent performance level as of Monday.
It is estimated that around 900 towers alone in Calcutta have been hit by the cyclone. Thousands have not been able to work from home. People have not been able to reach their family or doctors for emergency consultations. Some towers that have resumed operations are hit afresh by erratic power supply and bottlenecks in supply of diesel.įor the past five days, thousands of people in the two 24-Parganas, Howrah and Hooghly have not had any connection.Ī call from Gariahat to Beliaghata took 11 attempts on Monday spread over three hours to connect the users at either end.Ĭonnectivity got worse further from the city.Fallen trees have stalled the movement of service personnel and supply of diesel which is critical to run generators for power backup. Damage to the base transceiver stations (BTS) that facilitate wireless communication between a device and the network.The following are some of the problems listed by some telecom service operators and telecom infrastructure companies, besides the power problem.
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