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ABSTRACT Beach nourishment design requires a multi-disciplinary approach, the main aspect of design is related to a deep knowledge of the coastal zone and its processes to define: suitable kind of beach nourishment, characteristic of fill material and availability of submarine borrow sites. For an improved/integrated design need to be considered not only the Equilibrium Profile Theory and Depth of Closure, with their time-scale related aspects, but also environmental quality and suitability of resources. The most important beach nourishment problem it's to find a suitable site with high ‘quality’ material. In this paper the Authors underline that quality is not a strictly design concept but it's also referred to a more complex combination of sedimentologic, biogeochemical and environmental parameters whose equilibrium is sometimes difficult to define at the borrow site and at the eroded beach too. An integrated methodology is proposed to face the sand mining referring to sediment quality parameters definition. INTRODUCTION The use of traditional coastal structures to prevent shore erosion (i.e. sea-wall, groin and breakwater) has shown, in long term monitoring, unwanted environmental effects near and on adjacent beaches. In the last decades, ‘soft engineering’ measures like beach nourishment, become very popular as their technical advantages as their environmental sustainability. Beach nourishment could be an important solution to prevent beach erosion and degradation maintaining the right balance between cost and benefits to social and economic interests. Recently, beach nourishment design by mean sand capture at borrow marine sites find a great application in eroded areas of great economic value. Seasonal small nourishments are frequently used to solve effects of short-term erosion due to winter storms, and to recover beaches particularly dedicated to tourism exploitation. A more complex solution (i.e. protected beach nourishment) is used to stop long-term structural erosion.
- Geology > Geological Subdiscipline (0.49)
- Geology > Sedimentary Geology (0.47)
- Reservoir Description and Dynamics > Reservoir Characterization (0.70)
- Health, Safety, Environment & Sustainability > Environment (0.54)
- Health, Safety, Environment & Sustainability > Sustainability/Social Responsibility (0.54)
- Data Science & Engineering Analytics > Information Management and Systems (0.47)
Coastal Erosion Processes Modeling At Maronti Bay (Ischia Island – Southern Italy)
Giordano, Laura (Istituto per l'Ambiente Marino Costiero IAMC-CNR) | Ferrante, Vincenzo (Seconda Università degli Studi di Napoli) | Marsella, Ennio (Istituto per l'Ambiente Marino Costiero IAMC-CNR) | Vicinanza, Diego (Seconda Università degli Studi di Napoli)
ABSTRACT Numerical models of sediment transport phenomena in shallow water are very useful to understand the erosion mechanisms in real cases. The Authors present a typical Italian pocket beach affected by an evident erosion trend. The paper aim is to understand the natural behaviour of this peculiar pocket beach and consequently determine the causes producing the net sediment loss. The work is conducted applying a new integrated Coastal Area Model by mean the nearshore circulation and sediment transport dynamically linked to predict morphological and 3D bathymetry changes. The paper shows results from two different scenarios: the extreme sea storm event occurred in 28–29 December 1999 and a morphological average wave condition. INTRODUCTION The classical engineering approach to the study of morphological changes in coastal areas is based on the application of extremely simple numerical instruments that allow to supply information about shoreline feature evolution, with greater accuracy for the longer temporal scales (i.e. through semi-empirical equations). In particular, the classical numeric approach is based on the so-called ‘one-line' models that allow to simulate both longitudinal (Pèlnard-Considére, 1969) and crosssectional evolution (Dean, 1977) of shoreline. This approach allows translating the morphodynamic behaviour through the calibration of specific empirical coefficients as they include the beach characteristics (ie. diameter of sediments, bathymetric characteristics) and also wave climate parameters of the coastal area. Obviously such numerical models are extremely simple, just because they are limited to reproduce totally morphodynamic phenomena by mean some approximations not considering physical parameters of the coastal system that instead seem to have a remarkable weight on the morph-bathymetric evolution. In this paper the not cohesive sediment transport problem has been faced with a so-called ‘process based’ approach. In such way, the coastal dynamic has been decomposed giving a central role to the simulation of physical processes.
- Europe > Italy (0.67)
- North America > United States > California (0.28)