Two-Step Simulation of Underwater Terrain in River Channel

When studying river hydrodynamics and water quality evolution laws on the basis of numerical simulation analysis, it is necessary to carry out topographic interpolation along bend direction measured section, as this can provide accurate reliable data for modeling. In paper, a two-step terrain method based sparse discrete sections proposed by comprehensively considering trends lack monitoring sections. On establishing reference using centerline coding spatial relationship river, linear weight method, which uses distance gradient change between known sampling elevation section realize preliminary encryption points with any number longitudinal horizontal distance, carried first. Considering structural anisotropic characteristics improved inverse weighting (IDW) further used locally interpolate encrypted obtain continuous surface terrain. order prove effectiveness part Qinhuai River in Nanjing was taken research object. The experiment setting different spacing distances densification methods local simulation. Root mean square error (RMSE) absolute (MAE) are evaluate overall performance methods. experimental results show that paper overcomes obvious inaccuracy directly an algorithm generate due data. generated IDW calculation more reasonable, unobstructed, reflecting original accurately.