*3.3. Ocean Modelling*

Six land boundary configurations were defined to evaluate the impact of river influence on the ocean waters of western Iberia. Meteorological and open ocean boundary conditions were the same for all the scenarios. The scenarios are:


**Table 2.** Basic statistics for the outputs from the Tagus and Douro proxies when forced with observed flows (Obs.) and when forced with watershed models (Model). \* Values were calculated with the absolute values.


**Figure 6.** Flow (**<sup>a</sup>**,**b**), zonal velocity (**<sup>c</sup>**,**d**), salinity (**<sup>e</sup>**,**f**) and temperature (**g**,**h**) obtained at the mouth of the estuary proxy forced with observed (Orange line) and modelled (Blue line) river flows in the Douro (left) and Tagus (right) estuaries for the period of May 2017–December 2018. Brown colours indicate overlapping values.
