Comparative study of base flow separation methods-Taking Huaxian station of Weihe River for example

Base flow is an important component element of water resources, which plays an important role in maintaining ecological base flow. Due to the difficulty in measurement, it is important to select an adaptive base flow separation method for further base flow research. Taking Weihe River Basin as the research object, based on the hydrological data of Huaxian County, this thesis adopts three different separation methods (PART, digital filter technique, and base flow index (BFI) separation method) to undertake a comparative study. The study shows that digital filter technique is the best one. And through analysis of Weihe River by this method, the base flow of Weihe River gradually reduces since 1930s.