Abstract
Seawalls are important infrastructure for coastal areas to resist natural disasters such as storm tides and typhoon waves. Traditional seawall construction often causes intertidal zone fragmentation and coastline hardening, which affects the ecological function of the coastline. Ecological seawalls have both functions of disaster prevention and ecology and have become an inevitable trend in seawall construction at home and abroad. However, constructing a comprehensive, scientifically rational evaluation index system for ecological seawalls is a critical and pressing challenge. This study is based on the summary of practical research on seawall construction and puts forward the connotation of ecological seawall clearly. Twenty indexes that reflect the safety, ecology and sustainability of ecological seawalls were selected, and a three-level comprehensive evaluation index system of ecological seawalls was constructed using the Analytic Hierarchy Process (AHP). Three cases, including the second stage of the ecological seawall of the large-scale narrowing project in Yuyao City, Zhejiang Province, were used in this evaluation system. The application results showed that the constructed comprehensive evaluation index system of ecological seawalls in this study has a reasonable evaluation index, and the evaluation result is reliable, which is suitable for popularization and application. This study clarifies the index system and construction method for the comprehensive evaluation of ecological seawalls, puts forward typical measures for ecological seawall construction from five aspects: shore beach protection, seawall body structure, seawall surface protection, building materials and vegetation selection, and provides theoretical and practical guidance for studying and judging the ecological problems of seawalls and guiding the construction of ecological seawalls.