As the resolution of DEMs is becoming higher, both the efficiency and accuracy of channel head recognition are important for drainage network extraction. In this paper, a D8-compatible high-efficient channel head recognition method is proposed. For each potential channel, this method first calculates a geomorphologic parameter series along the flow path, and then determines the channel head by detecting the change point in the series. Instead of directly using one threshold value for a whole region that is still commonly used in D8-based methods, the proposed method recognizes channel heads by their local geomorphology one by one. The proposed method is applied with high resolution DEMs for different terrains, and the identified channel heads and extracted drainage networks show good agreement with observations. In comparison with a popular software with state-of-the-art channel head recognition method, the proposed one shows similar accuracy but much higher computational efficiency.

随着DEM的分辨率越来越高，通道头识别的效率和准确性对于排水网络提取至关重要。本文提出了一种兼容D8的高效信道头识别方法。对于每个潜在通道，此方法首先计算沿流动路径的地貌参数序列，然后通过检测序列中的变化点来确定通道头。所提出的方法不是直接针对仍基于D8的方法中仍普遍使用的整个区域使用一个阈值，而是通过通道头的局部地貌一一识别出通道头。所提方法适用于不同地形的高分辨率DEM，识别出的河道顶部和提取的排水网络与观测值具有良好的一致性。