Application of satellite infrared data for mapping of thermal plume contamination in coastal ecosystem of Korea.
ABSTRACT The 5900 MW Younggwang nuclear power station on the west coast of Korea discharges warm water affecting coastal ecology [KORDI report (2003). Wide area observation of the impact of the operation of Younggwang nuclear power plant 5 and 6, No. BSPI 319-00-1426-3, KORDI, Seoul, Korea]. Here the spatial and temporal characteristics of the thermal plume signature of warm water are reported from a time series (1985-2003) of space-borne, thermal infrared data from Landsat and National Oceanic and Atmospheric Administration (NOAA) satellites. Sea surface temperature (SST) were characterized using advanced very high resolution radiometer data from the NOAA satellites. These data demonstrated the general pattern and extension of the thermal plume signature in the Younggwang coastal areas. In contrast, the analysis of SST from thematic mapper data using the Landsat-5 and 7 satellites provided enhanced information about the plume shape, dimension and direction of dispersion in these waters. The thermal plume signature was detected from 70 to 100 km to the south of the discharge during the summer monsoon and 50 to 70 km to the northwest during the winter monsoon. The mean detected plume temperature was 28 degrees C in summer and 12 degrees C in winter. The DeltaT varied from 2 to 4 degrees C in winter and 2 degrees C in summer. These values are lower than the re-circulating water temperature (6-9 degrees C). In addition the temperature difference between tidal flats and offshore (SSTtidal flats - SSToffsore) was found to vary from 5.4 to 8.5 degrees C during the flood tides and 3.5 degrees C during the ebb tide. The data also suggest that water heated by direct solar radiation on the tidal flats during the flood tides might have been transported offshore during the ebb tide. Based on these results we suggest that there is an urgent need to protect the health of Younggwang coastal marine ecosystem from the severe thermal impact by the large quantity of warm water discharged from the Younggwang nuclear power plant.
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ABSTRACT: RESUMEN: Algunos sistemas costeros de México han visto alteradas sus actividades económicas en los últimos años por los impactos que causa la industria. Estas alteraciones son atribuidas en ocasiones, a la operación de plantas de generación de energía eléctrica como las Centrales Termoeléctricas, de la Comisión Federal de Electricidad. En particular, el sobre-incremento de la temperatura del mar, a causa de las descargas térmicas de estas plantas, ha sido un fenómeno al que se le imputan afectaciones, esencialmente en cuanto a la pesca se refiere. ABSTRACT: Some coastal systems of México have suffered many alterations of the economic activities in recent years because of the impacts caused by the industry. These alterations are sometimes attributed to the operation of power plants, such as the thermal power stations of the Federal Electricity Commission (CFE). In particular, negative impacts essentially on fishing activities have been related to the over-increase of sea temperature due to thermal discharges from these plants. Thus, the present work shows a methodology to analyze hydrodynamics and thermal plume dispersion caused by power plants. The case of study is the thermal plume of the Presidente Adolfo Lopez Mateos Thermal Plant, located in Tuxpan, Veracruz, Mexico. The main objective is to determine flow patterns and the physical influence of the thermal plume in the surrounding aquatic systems through field measurement and numerical simulation, by applying thermal dispersion models coupled with hydrodynamic models.XXV Congreso Latinoamericano De Hidráulica, Santiago de Chile; 08/2014
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ABSTRACT: Monitoring of warm distribution in water is fundamental to understand the performance and functioning of reservoirs and lakes. Surface water temperature is a key parameter in the physics of aquatic systems processes since it is closely related to the energy fluxes through the wateratmosphere interface. Remote sensing applied to water quality studies in inland waterbodies is a powerful tool that can provide additional information difficult to achieve by other means. The combination of good real‐time coverage, spatial resolution and free availability of data makes Landsat system a proper alternative. Many papers have developed algorithms to retrieve surface temperature (principally, land surface temperature) from at‐sensor and surface emissivity data. The aim of this study is to apply the single‐channel generalized method (SCGM) developed by Jiménez‐Muñoz and Sobrino (2003) for the estimation of water surface temperature from Landsat 7 ETM+ thermal bands. We consider a constant water emissivity value (0.9885) and we compare the results with radiative transfer classic method (RTM). We choose Embalse del Río Tercero (Córdoba, Argentina) as case study because it is a reservoir affected by the outlet of the cooling system of a nuclear power plant, whose thermal plume could influence the biota’s distribution and biodiversity. These characteristics and the existence of long term studies make it an adequate place to test the methodology. Values of estimated and observed water surface temperatures obtained by the two compared methods were correlated applying a simple regression model. Correlation coefficients were significant (R2: 0.9498 for SCGM method and R2: 0.9584 for RTM method) while their standard errors were acceptable in both cases (SCGM method: RMS=1.2250 and RTM method: RMS= 1.0426). Nevertheless, SCGM could estimate rather small differences in temperature between sites consistently with the results obtained in field measurements. Besides, it has the advantage that it only uses values of atmospheric water vapor and it can be applied to different thermal sensors using the same equation and coefficients.Advances in Space Research 09/2012; 51(3). DOI:10.1016/j.asr.2012.09.032 · 1.24 Impact Factor
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ABSTRACT: Qinshan Nuclear Power Station is located in the Haiyan County of Zhejiang Province in east China. The warm water from their cooling systems is discharged into the Hangzhou Bay directly which will affect the ecosystem of coastal area in the bay. To study the influence of warming effect from the thermal discharge of the Qinshan Nuclear Power Station Phase2 and Phase3, the remote sensing image of the marine airborne multi-spectrum scanner (MAMS), the numerical modeling based COHERENS (A coupled Hydrodynamical Ecological Model for Regional Shelf seas) and shipboard water column measurements are all applied to explore the spatial and temporal distribution of the warm water. In order to get accurate boundary conditions, a larger area was simulated firstly to provide hydrodynamic parameter for the modeling area in the numerical simulation. From the remote sensing image, the numerical simulation and field observations, we can conclude that the thermal effluent from the Qinshan Phase2 and Phase3 cooling systems just influences coastal water on a small scale.Proceedings of SPIE - The International Society for Optical Engineering 01/2009; DOI:10.1117/12.804838 · 0.20 Impact Factor