水文站点约束下的平原主体型河网提取方法OA

[Objective]In plain regions,the flat terrain and ambiguous flow directions lead to significant accuracy limitations in traditional DEM-based river network extraction methods.To address this technical challenge,this study proposes an improved extraction method integrating DEM elevation perturbation enhancement with hydrologi-cal station geographic information correction.[Methods]Firstly,the original DEM data were optimized through preprocessing steps including plain terrain identification,elevation perturbation enhancement,and depression fill-ing.Subsequently,the generated river network underwent flow direction and structural optimization by incorporating the spatial distribution information of hydrological stations.[Results]Comparative experiments in the small Tangbai River Basin area and the large-scale Jilin Province area demonstrated that,compared with the conventional method,the proposed method reduced the river network overlay errors from 2.51％to 0.45％and from 1.82％to 0.67％,re-spectively,demonstrating its superiority and applicability in river network extraction in regions dominated by plain geomorphology.[Conclusion](1)Elevation perturbation enhancement improves the identification accuracy of main streams and tributaries as well as river network continuity.(2)The incorporation of hydrological stations effec-tively corrects channel positions and topological structures,and the number of stations has a significant influence on river network extraction accuracy.(3)Compared with conventional methods,the proposed method shows significant advantages in the overlay error metric,with markedly improved river network extraction accuracy.This study vali-dates the effectiveness and practical value of the method,providing a reliable technical solution for accurate river network extraction in plain regions.