## 3 Results
### Hydrodynamic Description of Fangar Bay
In order to conduct an episodic analysis, the time series were filtered using a 30 h Lanczos [31] to focus on the low-frequency signal. Figures 8 and 9 show the rotated and filtered components of water currents jointly with wind, temperature and mean flow. Additional measurements of T and S are also shown in Figure 8, with Figures 8d,e and 9c-e presenting the estuarine circulation mentioned previously, whereby the surface water flows out from the bay (negative and blue color) while the bottom water circulation enters (positive and red color). These periods were characterized by a strong stratification. This was due to the fact that the irrigation channels during FANGAR-I were open, contributing to the discharge of fresh water into the bay (Figure 8c). The same occurred at the beginning of FANGAR-II. Marked with a black box are the episodes of NW winds in Figure 8. Note that during these episodes, both temperature and salinity were homogenized (Figure 8b,c) and there was a change from positive estuarine circulation to homogeneous currents in the water column. Moreover, a substantial drop in sea bottom temperature occurred (Figure 8f), notably during episodes E1 and E2 in Figure 8, and during events E3 and E4 in Figure 9. Note that during NW wind episodes, the currents were opposite to the wind direction in both locations (i.e., M and B). Figures 8g and 9g shows the average flow through the mouth. It can be seen that during the NW episodes the net flow is outflow in the central area of the channel, while in the rest of the period occurs the opposite. Figure 8: From top to bottom, wind speed (**a**), time series of temperature at a central point of the bay (**b**), time series of salinity at a central point of the bay (**c**), alongshore currents in mouth (**d**), alongshore currents in the bay (**e**), and bottom temperature (**f**) in mouth (blue) and bay (red), mean flow (positive inflow) in the mouth (**g**). The black boxes show the NW events. The dotted lines mark the days of the vertical sections shown in Figure 10.  
The water temperature observations during FANGAR-I exhibited variations of between 23 \({}^{\circ}\)C and 29 \({}^{\circ}\)C (Figure 8b and f). The maximum temperature was reached on 4 August after the ambient temperatures reached 30 \({}^{\circ}\)C (Figure 8). However, just two days later on 6 August, the water temperature dropped drastically to 23 \({}^{\circ}\)C, indicating a difference of 6 \({}^{\circ}\)C. This event coincided with the presence of the NW winds, as can be seen in Figure 4:0 Once the wind stopped, the temperatures rapidly increased again, reaching 28 \({}^{\circ}\)C, as can be seen in Figure 8b-f. As noted in the previous paragraph, during episodes E1 and E2, the wind events started on 6 and 27 August, respectively. For both episodes, the temperatures began to drop from those dates and persisted during the subsequent days when the wind died down (Figure 8b-f). This temperature decrease was associated with a cold NW wind, alongside the likely contribution of an open sea entrance (i.e., colder) through the mouth, indicated by the reduction in water temperature observed a few days later, when the wind stopped. Figure 4:1 From top to bottom, wind speed (**a**), alongshore currents in the mouth (**b**), Hovmöller diagram in the mouth for the alongshore currents (**c**), alongshore currents in the bay (**d**) and Hovmöller diagram in the bay for the alongshore currents (**e**), and bottom temperature (**f**) in the mouth (blue) and the bay (red), mean flow (positive inflow) in the mouth (**g**). The black boxes show the NW events. The dotted lines mark the days of the vertical sections shown in Figure 4:2  
During FANGAR-II, the water temperature was lower than FANGAR-I because the ambient temperature decreased (i.e., autumn season) (Figure 9a). Throughout FANGAR-II, water temperatures between 11 \({}^{\circ}\)C and 25 \({}^{\circ}\)C were recorded.