Multi-flow direction algorithms for extracting drainage network based on digital elevation model

摘要

A set of multi-flow direction algorithms for extracting drainage network form digital elevation model (DEM) based on ground water overflow model is introduced. As single-flow direction algorithms, the algorithms perform some tasks as following: depression identification and treatment; relief increment of flat areas; flow vector determination and drainage network. But in the flow vector determination process, we use multi-flow direction algorithm. We extract drainage network form a set of digital elevation model in Changsha, Hunan Province using this method to test these algorithms. The experiment result shows that these algorithms are efficient and avoid parallel currents, the shortcoming of single-flow direction algorithms.