BEACH STATIC EQUILIBRIUM MODEL AND ITS APPLICATION

The headland-bay coast, where prevail active human activities, is an important part of the global coastal system and the study of such a coast is of great significance to coastal construction and development. Coastal scientists and engineers have tried hard to describe and quantify this kind of coast using various mathematical formulas, especially since the 1980s, and a variety of empirical models have been obtained. With the rapid development of computer technology in the new century, these theoretical results have been integrated into software, which makes the application of the theory more convenient and user-friendly, and the application of the theory is getting more common day by day. This paper made a detailed introduction to the static equilibrium bay theory and its application, taking some examples as cases, such as the construction of artificial islands and its impacts in Sanya Bay, the unstable beach in Imbituba, Brazil, the beach maintenance improvement program in Weifang coastal resort and the beach design in Gijon, Spain. Detailed discussion is devoted to the further application of the static equilibrium theory to beach stability assessment and interpretation, the selection of schemes to protect the coast from erosion, the use of the theory to beach evaluation and beach design and the assessment, improvement and construction of subsequent coastal programs.