Beach Nourishment Monitoring Between Headlands And Stability Analysis

Through studying the beach erosion at home and abroad, and understanding ofthe domestic beach conservation cases deeply，the author summarized the varioustypes of beach nourishment on the different coast，analyzed the pros and cons of thedifferent methods of beach nourishmenth, more systematicily described the entireprocess of artificial beach nourishment and the following stability analysis after theproject.Among the many types of Beach nourishment, the beach nourishment betweencapes is the most likely to succeed.In this paper,we focus on this point，and make anexapmple with QingDao HuiQuan Bay beach and the LongKou Moon Baybeach,analysis the main reason of success of the beach nourishment between twoCapes on all sides.And the balance of the beach is aslo discussed from a macroside.The software MepBay developed based on the parabolic model,makes it easy andefficient to get the equilibrium shoreline.The study find that the main reason of HuiQuan Bay beach tending to stable isdemoliting the jetty in the bay.It allows the recovery of hydrodynamic environment tomake sure the stablity of the beach.Artificial recharging sand to nourish the beachmakes a great contribution to gain the stabler and wider beach.Especially,themechanisms of headland affceting wave diffraction,makes a great influence on theshoreline shaping.Because of the wave diffraction,when it comes to the beach fromremote regions,the wave direction changes apparently.The energy of the waveconcentrates at the top of the Cape,and spreads in the portion obscured.Waves towardthe coast at some angle, the wave breaking and generates coastal streams and coastalsediment transporting.The shoreline will be adjusted to reduce the angle between theincident to the shoreline and the efficiency of coastal streams will be smaller, so the beach is gradually approaching equilibrium, achieving the desired effect of beachnourishment without secondary hard project (such as offshore dams, submergedbreakwater).For example， two natural capes of HuiQuan Bay beach make itpossible to be succeed in beach nourishment without any artificial hard projects. Aswell as the interaction with the normal waves,the unique location and distributiondirection of the two headland have a good reference for people, the pier’s negativeeffects also sounded the alarm for people in the coastal engineering practice.As an artificial-building headland to beach nourishing, Longkou Moon Baybeach not only shows the effectiveness and feasibility of artificial-building headlandsto nourishing beaches,but aslo provide a a realistic basis for the analysis of thebalance of the Cape Bay Beach.Through imitating nature artificially, buildingartificial headland,to beach nourishing on the flat sandy beach. Based on Moon Baylocal wave climate conditions,spacing position and distribution orientation of the twoartificial headland all had been suitablly designed, so that the headland can maintaina stable environment to generate sufficient hydrodynamic effects. By shorelinesimulating,we can find that Moon Bay beach current morphology is consistent withthe balance shoreline simulated, and changes in cross-section single-wide sediment israther slight through the process of profile monitoring, indicating whether it is fromthe plane or profile,Moon Bay beach Beach has become the equilibrium state,namely the flat equilibrium and profile equilibrium.Survey found that Longkou MoonBay beach not only can maintain its steady state from erosion, but also in thesouthwest side wave shadow zone of the headland appeared slowly depositionphenomenon. Indicating that the distance of the two headlands still can be increased,which can make longer and more wider beach, the value of project and traveleconomic is rather obvious.