Active mechanisms controlling morphodynamics of a coastal barrier: Ilha Comprida, Brazil
نویسندگان
چکیده
The Cananéia-Iguape lagoon-estuarine system, where the Ilha Comprida barrier (IC) is located, one of most dynamic coastal areas on southeastern Brazilian coast. IC island a 63 km-long and it limited by Icapara inlet to north, Cananéia south. This system has been affected intense changes in its morphology since opening Valo Grande artificial channel 1852 A.D., connecting nearby Ribeira de Iguape river Mar Pequeno lagoon. In this context anthropogenic disturbance systems, objective study understand active mechanisms, both natural anthropogenic, controlling morphological northeastern portion IC, from monthly as well centenary timescales. We analyzed successional addition erosion beach ridges using multi-temporal dataset obtained Optically Stimulated Luminescence, aerial photos (1962 2000), satellite images (1980-2016) GNSS surveys (2015-2017). results were compared climatic (rainfall waves) data. Northeastward migration rates ranged 15.5 m/y, surveys, 154 calculated based OSL rates. Changes northeastward are related interference, mainly climate changes. Sediment accumulation occurred during summer baymouth spits. depositional scheme consistent with highest values flow low synergy waves coming South. By contrast, retrogradation coastline occurs winter, when wave power stronger than summer. seasonal configuration controlled bidirectional longshore drift fluvial discharge.
منابع مشابه
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ژورنال
عنوان ژورنال: Ocean and Coastal Research
سال: 2021
ISSN: ['2675-2824']
DOI: https://doi.org/10.1590/2675-2824069.20-338mss