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Coastal Engineering Processes, Theory and Design Practice
37 SOLVED PROBLEMS
Question: 4.1
Calculate the tide-generating force on the Earth due to the Earth-Moon and Earth-Sun systems, given that the mass of the Earth, (m), is = 5.98 × 10^24 kg, the mass of the moon, (M), = 7.35 × 10^22 kg, the major semi-axis of the lunar orbit around the Earth, (r), is 3.84 × 10^8 m, and the mean radius ...
Question: 3.2
Complete Table Q1 by determining the values of the spectral energy density (S(f)) at frequencies f = 0.088 Hz and f = 0.113 Hz from the following data: wind speed U10 = 20 m/s, fetch length F = 220 km. ...
Question: 7.6
For a particular structure, the allowable overtopping threshold Q0 is normally distributed with mean 10 and standard deviation 4 l/s/m-run, and the overtopping discharge under design storm conditions is normally distributed with mean 3 and standard deviation 3 l/s/m−run. Calculate the reliability ...
Question: 5.2
SUSPENDED SEDIMENT TRANSPORT IN A TIDAL CURRENT Calculate the total suspended sediment transport rate in a tidal current given the following data: Depth mean current u = 2.0 m/s, grain size D50 = 0.4 mm, water depth h = 10 m, sea water density ρ = 1027 kg/m³ (@ 10° C and salt content 35 ppt) ...
Question: 4.2
The tidal constituents for four harbours are given in the following table. Classify the tidal regime at each harbour using the tidal ratio. Estimate the maximum tide level at each harbour. Calculate the length of the spring-neap cycle at harbours A and D. The mean water level relative to the local ...
Question: 4.6
Derive a suitable approximation for the Coriolis parameter for regional scale motions centred on a latitude of θ0. ...
Question: 4.4
This example illustrates how information on spring and neap tidal information can be related to tidal constituents to derive further information to assist in a practical problem of safely docking a ship in harbour. A port is located in an estuary, upstream of a bridge whose deck base is at +20 m CD ...
Question: 4.5
Given the following information for observed ocean tide levels (semidiurnal) at an established gauge and a new survey site, calculate the sounding datum for the new site. ...
Question: 4.8
Find the periods of free oscillations in the following cases: 1. A long narrow lake of uniform depth 15 m and length 5 km. 2. An open-ended channel of depth 20 m and length 10 km. ...
Question: 4.9
Nonlocal forcing results in an oscillation of frequency ω0 whose amplitude at the mouth of a channel is Q. If the channel is of constant depth H and of length A, determine a general expression for the amplitude of the oscillation at the head of the channel. Calculate specific values for the case ...
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