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We developed a coupled salt and water balance model to represent the stream salinity generation process fol- lowing land use changes. The conceptual model consists of three main components with five stores: (i) Dry, Wet and Subsurface Stores, (ii) a saturated Groundwater Store and (iii) a transient Stream zone Store. The Dry and Wet Stores represent the salt and water movement in the unsaturated zone and also the near-stream dynamic saturated areas, re- sponsible for the generation of salt flux associated with sur- face runoff and interflow. The unsaturated Subsurface Store represents the salt bulge and the salt fluxes. The Ground- water Store comes into play when the groundwater level is at or above the stream invert and quantifies the salt fluxes to the Stream zone Store. In the stream zone module, we consider a "free mixing" between the salt brought about by surface runoff, interflow and groundwater flow. Salt accu- mulation on the surface due to evaporation and its flushing by initial winter flow is also incorporated in the Stream zone Store. The salt balance model was calibrated sequentially following successful application of the water balance model. Initial salt stores were estimated from measured salt pro- file data. We incorporated two lumped parameters to repre- sent the complex chemical processes like diffusion-dilution- dispersion and salt fluxes due to preferential flow. The model has performed very well in simulating stream salinity gener- ation processes observed at Ernies and Lemon experimental catchments in south west of Western Australia. The sim- ulated and observed stream salinity and salt loads compare

A daily salt balance model for stream salinity generation processes following partial clearing from forest to pasture