Assessing water surface temperature from Landsat imagery and its relationship with a nuclear power plant

BONANSEA, MATIAS; LEDESMA, MICAELA; RODRIGUEZ, CLAUDIA; FERRERO, SUSANA; GERMAN, ALBA; PINOTTI, LUCIO; FERRAL, ANABELLA; CARREÑO, JOEL

HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES

IAHS PRESS

Año: 2020 vol. 66 p. 50 - 58

0262-6667

Water temperature is fundamental to understand the functioning of aquatic systems. The objective of this study was to assess the effect of warm water discharge from a nuclear power plant on the water surface temperature (WST) of a reservoir. Using a 6-year Landsat-derived WST dataset, which includes 3 years of the power plant being in operation (2013?2015) and 3 years in which the power plant was not functioning (2016?2018), the effect of the thermal pollution was assessed. The results show that, although the warm water discharge did not reveal a statistically significant increase on the mean WST of the reservoir (p > 0.05), multi-temporal Landsat imagery revealed that the power plant generated a local thermal impact. This was the principal heat flux following a dissipation line that was wide near the cooling channel and expanding towards the rest of the reservoir.