A mathematical model simulation indicates that a particular section of the coast

Question

A mathematical model simulation indicates that a particular section of the coastline is protected by a continuous line of sand dunes whose lowest elevation is at + 6.1 m relative to the datum. The mean sea level is + 3 m above the datum. The offshore coastal region has a mean water depth of 20 m and the continental shelf is 200 km wide. You are required to determine whether flooding of the inshore region would occur when the passage of a cyclone coincides with spring high water level. The following information is given: (1) Spring tidal range: 2.1 m (2) Barometric pressure difference of the cyclone: 90 hP. (3) Speed of the cyclone: 30 km/hr (4) Maximum wind speed: 60 m/s, C_D = 1.9 times 10^-3

Explanation / Answer

The lowest level of elevation=+6.1m

The mean sea level is +3m above the datum. That is the sea level is at +9.1m from the lowest level of sand dunes(from ground level it is measured).

Depth of coastal region=20m

When a cyclone coincides with spring high water level,definitely flooding would occur.

The speed and pressure difference of cyclone are very high when compared to normal sea level and the normal wind speed can be expected around 20-40m/s. When a cyclone occurs,the speed increases by three times and it is 60m/s. Calculating all these factors,a flooding will occur.

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