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# BASIC COASTAL ENGR OCEN 400

Texas A&M

GPA 3.55

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This 6 page Study Guide was uploaded by Collin Harvey on Wednesday October 21, 2015. The Study Guide belongs to OCEN 400 at Texas A&M University taught by Patrick Lynett in Fall. Since its upload, it has received 51 views. For similar materials see /class/225820/ocen-400-texas-a-m-university in Engineering Ocean at Texas A&M University.

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Date Created: 10/21/15

OCEN 400 113005 Final Exam Review Problems There are few problems below which hit on most of the topics to be covered by the nal exam You should also be sure to review all of the exercises we did in class as well as your old exams 1 L V A proposed beach nourishment will add a width of 45 m to the preexisting beach which had an Anmive of 0099 mm The nourishment material has an A l of 0095 mm Determine the volume of sand that will be required per meter of shoreline assuming that the depth of closure is 4 In Use the equilibrium profile theory to calculate the volume Also calculate the diameter for the two materials A breakwater is to be built off the coast of Rollover Pass where the design storm has an offshore signi cant wave height of35 m with a peak period of 12 seconds Assume that tetrapods with a specific gravity of 20 will be used with a slope of 12 on the trunk and 13 on the head The structure is parallel to the coast in a water depth of 5 m Moreover assume that the waves approach perpendicular to the beach a Determine the design wave at the structure use the wave height with a probability of exceedence of 110 b Determine the weight of armor for the trunk and head c Determine the weight of the rock in the first underlayer which is composed of rough rock d Calculate the thickness of the armor layer e Calculate the width of the top of the breakwater f Determine the maximum expected runup A fishing pier is to be constructed in Freeport The seaward end of the pier will have normal water depths of 3 m at MLW Assume that the maximum storm surge including wave setup for which we will design is 2 m The tidal range is 18 m Assume that the design wave period should be approximately 11 sec The waves are breaking at the pier with a breaking index of 078 The offshore slope is 150 a What is the design wave height b Assume further that the piles used for the pier will be prestressed concrete round and 18 in diameter If the pier is located at an elevation of 5 m above the mean storm water level what will be the maximum total drag and the maximum total inertia force on the pile Use linear theory CD10 and CM20 4 Determine the stability of the proposed vertical breakwater design 0 Breakwater crest elevation above MWL 3 m o Breakwater height 75 m o Breakwater width 8 m 0 Density of breakwater material 2500 kgm3 0 Depth at breakwater face 4 m Subject to the following offshore deepwater wave conditions 0 Hs22m o T12 s o 0c00 0 Design storm surge elevation 12 m o Tidal range 06 m At this location it is reasonable to assume that the breaker index is roughly 10 5 A preliminary engineering analysis of a tidal inlet is required in order to determine if the inlet can be used for commercial ship traffic The inlet has an average depth at MWL of 5 m an average width of 15 m a length of 200 m and exits into a lagoon that is roughly rectangular in shape with side lengths of 10000m by 150m The tide is semidiumal with atidal amplitude of 143 m The beach sediment has a D50035 mm No information of the nearshore wave conditions is known except that we can expect a breaker index of 095 The average deepwater wave conditions are 0 Hs065 m o T8 s 0 CPU0 Determine the following a Tide amplitude in the lagoon b Maximum velocity in the inlet c Time lag of time in lagoon d Classify the inlet e Tidal prism f Wave height depth and angle at breaking g Potential transport rate h Inlet stability Give your recommendation regarding whether the inlet can be utilized by commercial traffic OCEN 400 110607 Exam Review Problems 1 Diffraction determine whether the breakwater shown below will be overtopped The breakwater has a freeboard height above swl of 15 in and is located within a harbor whose seaward walls are parallel to the shoreline The design wave has a height of 28 in a wavelength of 100m and approaches the shoreline at an angle of 30quot off normal The water depth for this problem can be considered a constant 10m 39 my 7 1 300m m l goon i qim i 2 4 w i i X l A dounscu 95a Figure llT11 Diffraction for a breakwater gap of one wavelength width where 2 39 39 39 39 39 fallvelocity 39 quot quot quot 1 W1 1 99 1 ms 1 9 1 cans 1 111 loamsal 111111111 111 1 9911 cw 315 1 us 511911111111 51m 51m 8 E i c 19 11 1911 91111 5121 W mwmnms 119111111 5119119911119111991199999959111119 mum2191919119an 1111 1199 3 Crossshore Tranqmrt 7 Beach Pro les A jetty is to be constructed to an offshore distance of 250 rn The design width ofthejetty is 5 rn and thejetty will be 1 rn above the swl at all locations Find the required Volume ofmaterial to construct thejetty ifthe mean beach sand diameter is 068 mm fable 1quot a Summarya 911111111 11119 991 992 99 1195 995 995 9111 991 9119 9 9 959 911972 9 9714 9 9759 a 9795 9 994 9 9972 9 9991 9 9939 9 9999 92 9199 9199 9199 9199 9112 9115 9117 9119 9121 9129 99 9125 9127 129 9191 9 139 9195 9197 9199 9141 9143 99 9145 914 91192 91499 9 1514 9153 9 15111 9 1592 91579 91594 95 9151 91922 91934 9 1919 91959 9167 91992 9 1994 91799 91719 99 9179 91742 91754 91799 a 17713 9179 91592 9 1914 91929 91999 97 9195 91959 91999 911377 91995 91995 91994 91919 1922 1931 9 9 9194 91 91959 91999 9 1972 9199 91299 9 1995 9 2994 9 2912 9 9 9292 92925 9 2939 9 21m 9 2952 9 295 9 2999 9 2975 9 2994 9 2992 19 9219 92195 92119 92124 92192 92149 92149 92159 92194 92172 919195 111111911 92119 29999 some 19191111119995 are 9911919999919 51199991199111191 are known 1919919991129 9911211191 919 919599199 91 mnsmency 999 9999111911 19919 1111119 999919 1111919199 111 gram 51 121 As an example 9111991119 191995 1919919919 me ll 9911191919 1119919959119 5119 91921199115 A 9112 m 19 99919119 1911195 1912911 1111115 191111199 by13 291W 7 1 49 4 CrossShore Tramport Beach Fills A beach nourishment project is proposed to widen a sandy beach About 100 meters of beach is to be nourished the landward beach pro le is given below The existing beach sand has a diameter of 02 mm There are two available sediment sources for the nourishment project 1 diameter of 024 mm with an available volume ofthe ll material of40000 m3 and 2 diameter of 108 mm with an available volume ofthe ll material of 25000 m3 at a cost oftwice that for the ner ll 39 39 quot ifthede39red39 39L L HGURL FDR 5 41 5 5 LongShore Transport Transient Problem A Texas Tech graduate wins the lottery after graduation To show off to all his friends who are naturally unemployed he purchases a beach house The house is located 50 m oor the shoreline when he moves in on 151305 After one year on 181506 the Raiders neighbors decide they hate him and scheme to force him back to Lubbock where his kmd belongs The neighbors decide to increase the shoreline recession rate in front of his house by stealing sand when he is not looking The volume removed by his neighbors is 10 m3 per in length of beach every month 30 days The shoreline motion is given by the equation where hr 1 is the closure depth B l m is the berm elevation q is sand sink when positive or a source when negative and Q the potential longshore transport rate Use the standard quartz sand parameters for the sediment density and porosity Signi cant wave heights at breaking near the Raiders house are shown below and do not change in time Determine how long until the shoreline is gone in front of the Raiderquot house 5a m 5 5 3 ma n 15D m m blush Ill18 In t LI22 n gznutmaupeauuhg own a P in sunning 6 Coastal Structures A breakwater is to be built off the coast of Rollover Pass where the design storm has an offshore significant wave height of 35 m with a peak period of 12 seconds Assume that tetrapods with a specific gravity of 20 will be used with a slope of 12 on the tiunk and 13 on the head The structure is parallel to the coast in a water depth of 5 m Moreover assume that the waves approach perpendicular to the beach a Determine the design wave at the stlncture use the wave height with a probability of exceedence of 110 b Determine the weight of armor for the tlunk and head c Determine the weight of the rock in the first underlaycr which is composed of rough rock Calculate the thickness of the annor layer e Calculate the width of the top of the breakwater f Determine the maximum expected runup

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