Research on the function-oriented method for delimiting coastal setback lines in China

Under the planning background of the territorial planning reform, this research aims at the unbalanced benefits of regional economy and society and weak awareness of overall planning of sea and land. A method of delimiting coastal zone setback lines based on functional uses is proposed. Firstly, the definition and research connotation of the existing coastal retreat lines are extended to determine the way to delimit the coastal setback lines and the elements of coastal zone setback lines. Then, the functional uses of coastal zones are divided into three categories and eleven subcategories, and the connection between the functional use zoning of the coastal zones and the delimitation of the coastal zone setback lines is established, which lays a foundation for clarifying the management and control methods and subjects in the coastal zone setback line area. After that, combined with relevant studies at home and abroad, and based on the classification of coastal zone functions and uses, this research puts forward the delimitation methods of coastal zone setback lines in different functional areas from three perspectives: the starting line of the coastal zone setback line, the delimitation direction, and the retreat distance.