基于ArcGIS与断面法相结合的港口航道疏浚量计算

Method for the Dredging Volume Calculation in the Navigation Channel Based on ArcGIS and the Cross-section Technique

航道疏浚量可分为航道内主槽疏浚量和边坡疏浚量两部分,前者是主体.利用地理信息系统通用软件ArcGIS的矢量数据插值功能可由实测水深数据生成准确的航道疏浚基面,再利用该软件的叠置分析、栅格计算和空间分析功能,可方便而准确地计算获得航道内主槽疏浚量.在不同平面分界处布设计算断面,利用断面法可准确地计算出航道边坡疏浚量.两部分结合,即得航道疏浚量.此方法,始终从实测水深数据出发,有效提高了计算精度,且简便易行,便于操作和掌握.同时,能针对不同情况快捷计算,更好地为合理的疏浚方案设计与优选服务.

The dredging volume could be divided into two parts.One is the main trough dredging volume,which is the principal part;the other is the slope dredging volume.An accurate channel base can be got from bathymetric data,applying the function of vector data interpolation of ArcGIS,a common software for geographic information system.Further,taking advantage of its functions of overlay analysis,raster calculator and surface analysis,the exact main channel dredging volume can be acquired easily.Setting the sections at the key points and boundaries,with the cross-section method,the slope dredging volume could be taken.The whole dredging volume is the summation of the above two parts.As a user-friendly and easy to operate approach,it improves the accuracy of the result effectively,since the whole calculation processes bases on the bathymetric data constantly.Meanwhile,the different figures could be got rapidly calculated in different designed dredging situations,which makes it possible to optimize rational dredging design.