A diachronic view of the net longshore sediment drift during the Late Holocene at the Jequitinhonha River delta, Brazil, using numerical modeling

Anais da Academia Brasileira de Ciências

Abilio C.s.p. Bittencourt²  José M.l. Dominguez²  Clemente A.s. Tanajura¹  Iracema R. Silva¹  Louis Martin¹ 

[1] ,Universidade Federal da Bahia Instituto de Geociências CPGGSalvador BA ,Brasil

关键词: past and current longshore transport;    wave refraction;    numerical modeling;    Holocene;    Brazil;    transporte litorâneo passado e atual;    refração de ondas;    modelagem numérica;    Holoceno;    Brasil;   

DOI  :  10.1590/S0001-37652011005000041

来源: SciELO

【 摘 要 】

Using numerical modeling, this work estimates sediment dispersion patterns caused by the incidence of waves in five distinct coastline contours of the Jequitinhonha River delta plain during the Late Holocene. For this study, a wave cliate odel based on the construction of ave refraction diagras relative to the current boundary conditions as defined and assumed to be valid for the five coastlines. Numerical modeling from the refraction diagrams was carried out considering the angle of incidence and wave height along the coastline. This work has allowed us to reproduce past and current patterns of net longshore sediment drift defined by a conceptual model developed from the integration of sediment cores, aerial photograph interpretation, C14 datings and geomorphic indicators of longshore drift. These results show that, on average, current wave conditions in the east-northeastern Brazilian region seem to have remained characteristically the same from approximately 5100 years BP until the present time. This type of information can be important when attempting to simulate possible future situations in terms of the long-term general behavior of the east-northeastern Brazilian coastal region.

【 授权许可】

CC BY   
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