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Spatial Distribution Mapping of Cyanobacteria in Daecheong Reservoir Using the Satellite Imagery

위성영상을 이용한 대청호 남조류의 공간 분포 맵핑

Back, Shin Cheol;Park, Jin Ki;Park, Jong Hwa
백신철;박진기;박종화

  • Received : 2016.02.05
  • Accepted : 2016.03.09
  • Published : 2016.03.31

Abstract

Monitoring of cyanobacteria bloom in reservoir systems is important for water managers responsible of water supply system. Cyanobacteria affect the taste and smell of water and pose considerable filtration problems at water use places. Harmful cyanobacteria bloom in reservoir have significant economic impacts. We develop a new method for estimating the cyanobacteria bloom using Landsat TM and ETM+ data. Developed model was calibrated and cross-validated with existing in situ measurements from Daecheong Reservoir's Water Quality Monitoring Program and Algae Alarm System. Measurements data of three stations taken from 2004 to 2012 were matched with radiometrically converted reflectance data from the Landsat TM and ETM+ sensor. Stepwise multiple linear regression was used to select wavelengths in the Landsat TM and ETM+ bands 1, 2 and 4 that were most significant for predicting cyanobacteria cell number and bio-volume. Based on statistical analysis, the linear models were that included visible band ratios slightly outperformed single band models. The final monitoring models captured the extents of cyanobacteria blooms throughout the 2004-2012 study period. The results serve as an added broad area monitoring tool for water resource managers and present new insight into the initiation and propagation of cyanobacteria blooms in Daecheong reservoir.

Keywords

cyanobacteria;reservoir;spectral band;cost method;image smoothing

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Acknowledgement

Supported by : 충북대학교