深圳河清淤工程跟踪测量与回淤特征分析

Tracking Survey and Back-siltation Characteristics Analysis of Dredging Project of Shenzhen River

为了了解深圳河清淤后回淤特性,综合采用RTK配合测深仪无验潮测量法、三维激光扫描测量法和RTK测量三种方法,对深圳河清淤段进行了12次1∶500地形测量。根据每次测量数据,计算了各期回淤量,绘制了回淤曲线。采用MATLAB平台绘制了每期对应的回淤厚度图,直观表征了深圳河回淤情况。数据结果表明,这些技术方法能较好地完成数据采集工作,成果精度较高。在清淤后2年内,清淤段呈持续快速回淤态势,回淤量占清淤量的69%,回淤具有时空变化特性。

In order to understand the siltation characteristics of Shenzhen River after dredging,RTK combined with depth sounder nontidal survey method,3D laser scanning survey method and GPS RTK survey were used to carry out 12 times of 1∶500 topographic survey in the dredging section of Shenzhen River.According to the measured data,the amount of back-siltation in each period is calculated and the back-siltation curve is drawn.Based on MATLAB platform,the back-siltation thickness map of each area in survey interval is drawn,which can directly represent the back-siltation situation of Shenzhen River.The results show that these techniques can complete the data acquisition work well and the data accuracy is high.Within two years after dredging,the dredging section presents a continuous and rapid siltation trend,and the amount of back-siltation accounts for 69%of the amount of desilting volume.The siltation has the characteristics of temporal and spatial variation.