river head meaning in English

河道源头
河流发源地
河源

So , river capture can be taken as the time and space scale of geomorphologic evolution in quaternary in csmasr it can represent the process of river head wards erosion , expand of lincheng period denudation surface and the broken of yangping period denudation surface
认为河流袭夺是判断地貌演进，即临城期(第四纪)溯源侵蚀与仰平期剥夷面解体破碎的时空标尺，并据此探讨了临城期河流溯源侵蚀的时空格局。