潮滩含水量反演对研究海岸生物及物质传输等具有重要意义，现有方法存在一定的局限性。本项目利用长距离地面三维激光扫描仪（TLS）同步获取潮滩三维几何数据和回波强度数据，研究入射角、距离等因素对强度数据的影响机理及改正方法。利用标准漫反射目标和自然同质目标定量求取入射角、距离和强度数据之间的关系，构建长距离TLS强度数据整体改正模型。根据潮滩和植被的几何和激光反射特性差异，结合点云几何数据和改正后强度数据进行植被滤波，提取潮滩点云。根据水对长距离TLS发射激光的吸收特性，分析潮滩样本含水量及其改正后强度数据之间的关系，建立改正后强度数据与潮滩含水量之间的定量函数模型。利用长距离TLS改正后强度数据，实现多时相、大范围潮滩含水量的快速、全面和精确反演，为探析含水量的变化趋势和潮滩地形动态演变、生物生长习性等的内在关联提供理论依据，为潮滩区域的资源、水文、生态、环境、灾害等研究提供技术支撑。

Water content inversion for tidal flats is of great significance for the studies of coastal creatures, material transport, etc. However, the existing methods have certain limitations. In the present project, long-range terrestrial laser scanners (TLS) are used to simultaneously acquire the three-dimensional geometrical data and intensity data of the tidal flats. First, the influencing mechanisms and correction methods of various factors on long-range TLS intensity data are studied. Standard diffuse reflection targets and natural homogeneous targets are utilized to quantitatively estimate the relationships between the incidence angle, distance, and intensity data and to establish an overall model for the correction of long-range TLS intensity data. Second, based on the differences of the geometry and laser reflection characteristics between the point clouds of the tidal flat and vegetation, the geometry information and corrected intensity data are combined to filter the vegetation and extract the tidal flat. Then, according to the absorption characteristics of water to the emitted laser of long-range TLS, the relationship between the water content of the tidal flat samples and the corresponding corrected intensity data is analyzed to establish a quantitative function model between the corrected intensity data and the water content. Finally, the corrected intensity data of long-range TLS are used to achieve a rapid, comprehensive, and accurate method for multi-temporal and large-scale water content inversion for tidal flats. The project can offer theoretical bases for exploring the intrinsic relationships between the water content change trend and the dynamic evolution of tidal flats, biological growth habits, etc. In addition, the project can provide technical supports for the studies of resources, hydrology, ecology, environment, and disasters in tidal flats.