Hydrological Evaluation of Satellite Soil Moisture Data in Two Basins of Different Climate and Vegetation Density Conditions

Figure 2

Adopted flowchart of the XAJ model [50], where WU, WL, and WD represent the upper, lower, and deep soil layers’ areal mean tension water storage, respectively; EU, EL, and ED stand for the upper, lower, and deep soil layers’ evapotranspiration output, respectively; S is the areal mean free water storage; a is the portion of the subcatchment which is currently producing runoff; IMP is the factor of impervious area in a catchment; RB is the direct runoff produced from the small portion of impervious area; R is the total runoff generated from the model with surface runoff (RS), interflow (RI), and groundwater runoff (RG) components, respectively. These three runoff components are then transferred into QS, QI, and QG and combined as the total subcatchment inflow (T) to the channel network. The flow outputs from each subcatchment Q are then routed to the catchment outlet to produce the final flow result (TQ).