Study on Remote Sensing Monitoring of the Thermal Discharge in Songyu Power Plant Based on LandSAT8 Satellite Data

To summarize the distribution and variation patterns of the thermal discharge in Songyu Power Plant and the related influencing factors, based on the LandSAT8 sea surface temperature (SST) images, tide data, etc., the diffusion process of thermal plumes and its coupling relationship with the local hydrodynamic environment are comprehensively analyzed. The results show that temperature rise plumes occur in all seasons except summer, and their diffusion directions and distribution morphologies have a close relationship with the tidal fluctuation. The eastward and southeastward plumes mainly occur in the stage of the tide falling >2h, westward plumes happen in the phase of the tide rising $\geq$2h, and southward plumes generally appear in the initial rise period, that is, the tide rising <2h. The longer durations of the tide rising or ebbing, the greater the diffusion range of the thermal pollution tends to be. Moreover, the temperature field near the drainage outlets has a limited impact on the Xiamen Marine Reserve for Rare Marine Species and Gulangyu tourist and recreational area.