New Approach to Hydrograph Separation Using Wavelets

Abstract

An approach to hydrograph separation based on daily discharges in rivers is proposed to identify both groundwater and the other components with the wavelet multi-resolution analysis (MRA). The new approach decomposes hydrograph into local discharges components of different frequency levels, and reconstructs significantly the components. The approach includes two concepts, the base as the direct component of groundwater and the distribution rate as the contributing ratio of the wavelet components of different frequencies to groundwater component. Through superposing part of lower frequency components to the base, groundwater component is reconstructed owing to the fact that much preevent rain(groundwater)contributes to faster components such as interflows.