3D Simulation of Tidal Creek in Jiangsu Coast

摘要

Three-dimensional shape of tidal creek widely distributed in the tidal flat of Jiangsu coast was simulated in this paper. Water lines of tidal creek were extracted from high spatial resolution remotely sensed data and used to derive the centerlines of tidal creek by the method of Thiessen polygon. From downstream to upstream, the profile shape of centerlines presents piecewise linear increase based on the intersect points of tidal branch in one tidal basin. So on basis of known elevation of intersect points, we calculated to gain 3D shape of centerline. And last, using step by step expansion simulated the whole 3D shape of tidal creek. The error analysis showed that the 95% error was between ± 0.3m. This study realized the 3D simulation of tidal creek. The result demonstrated that from point to line to body (2D-3D) conversion was realized during this modeling process and 3D simulation method is effective. Due to complex natural condition and the lack of bathymetry data, terrain of tidal creek is difficult to obtain. So through this method we can only use a small number of measure points to easily obtain the 3D shape of tidal creek. It is very useful in topographic survey especially in Jiangsu coast where bathymetry is hard to carry out.