Distributed discharge and sediment concentration predictions in the sub-humid Ethiopian highlands: the Debre Mawi watershed

摘要: Experimental research in the Ethiopian highlands found that saturation excess induced runoff and erosion are common sub-humid conditions. Because most simulation models applied based on infiltration excess, we, as an alternative, developed Parameter Efficient Distributed (PED) model, which can simulate water sediment fluxes landscapes with runoff. The PED model has previously only been tested at outlet of a watershed not for distributed concentration within watershed. In this study, we compare storm against collected data 95-ha Debre Mawi three its nested sub-watersheds 2010 2011 rainy seasons. framework, hydrology is divided between infiltrating zones, taking place from two surface zones. Daily values, ranging 0.5 to over 30 mm 0.1 35 g l−1, respectively, were well simulated. Nash Sutcliffe efficiency values daily ranged 0.66 0.82, Nash–Sutcliffe concentrations greater than 0.78. Furthermore, uses realistic fractional areas subsurface flow contributions, example saturated (15%), degraded (30%) permeable (55%) main outlet, while close similarity was remaining parameter values. One exception occurred distinctly transport limited actively gullying lower part results suggest provides good representation observed spatially by modelling bottom lands (as opposed uplands) dominant contributor load. Copyright © 2014 John Wiley & Sons, Ltd.