河道烧录法在凌河流域河网提取中的应用

Application of the River Network Extraction by Stream Burning in Linghe River Basin

基于DEM的流域河网提取在流域水文信息提取中占有重要地位。原始的河网提取方法在凌河流域应用时所提取的河网信息与实际河网信息总体上一致,但在地势较为平坦的北票地区提取的河网信息与实际发生较大偏移。本文采用河道烧录改进了D8算法在凌河流域应用中的不足,从而大大地提高了凌河流域河网提取的精度,这对当前凌河流域数字化建设具有重要的应用意义。

The extraction of river network based on DEM plays an important role in the watershed hydrological information extraction. The result of original river network extraction method in Linghe Basin is consistent with the actual river network information on the whole. But the extraction of river network has larger deviation in relatively flat terrain of Beipiao. This article used the stream burning to improve the disadvantages of D8 algorithm in the application Linghe Basin, thus greatly increased the accuracy of river network extraction in Linghe Basin. It has important application significance for the current Linghe watershed digitization construction.