Fig. 2: Flow path concentrations of dissolved oxygen and reactive nitrogen.
From: Beaver dams overshadow climate extremes in controlling riparian hydrology and water quality
Modeled concentration profiles of dissolved oxygen (DO, blue line), nitrate (NO3−, green line), and ammonium (NH4+, orange line) along a riparian flow path at: a peak river discharge in 2018, a historically low water year; b baseflow conditions in 2018; c the maximum beaver dam water levels in 2018; and d peak discharge in 2019, a high-water year. Within each panel, gray shading indicates the extent of flow path over which DO concentrations are primarily determined by advection (i.e., where the Damköhler number for DO, DaDO, is less than 1). The dashed lines correspond to the point at which DO consumption overtakes advection as the primary determinant of DO concentration (i.e., where DaDO = 1). The unshaded regions denote where DO consumption determines DO concentrations (i.e., where DaDO > 1). Figure 1 indicates the water levels and hydraulic gradients corresponding to these concentration profiles. Model validation results are shown in Supplementary Figs. 13–15.
