The Tectonic Geneses of Regional Differential Distribution of Chinese Sandy Beaches

Session: Poster session

Gang Lei, Third Institute of Oceanography, State Oceanic Administration, China, [email protected]

Abstract

Formation and development of sandy beaches are a comprehensive result of the crust deep-processes and surface-processes. Based on the investigative results of distributional situations of sandy beaches along Chinese coasts, we analyzes the internal relations between the distributional patterns and the different depositional environments of coastal ocean on the different geologic tectonic zones formed in Mesozoic-Cenozoic eras in the East China. The genetic characteristics of regional differential distribution are studied, with aim to provide scientific basis for macroscopic allocation and management of coastal resources. The study indicates that: ? The formation and development of Chinese sandy beaches are controlled obviously by geologic tectonic zones formed in Mesozoic-Cenozoic eras, especially for the elevation and subsidence of diastrophic fault blocks of neo-tectonic movements, as a result, the distribution of beaches shows regional concentration in China. ? Chinese sandy beaches basically formed along the cape-bay coasts of tectonic uplifting zones and aggregated on the coasts of elevated regions caused by neo-tectonic movements, it is mainly determined by the regional coastal material resources for sandy deposits. ? Littoral sand transport and its redistribution patterns are varied in tectonic uplift zones which resulted in numerous types of accumulated morphology of Chinese sand beaches.