Dynamic Monitoring of Cage Culture in Danjiangkou Reservoir Based on Domestic High Resolution Satellite Imagery

Danjiangkou Reservoir is the water source of the Middle Route Project of South-To-North Water Diversion. Monitoring cage culture conditions is of great significance to guarantee the quality of the delivered water. The high-resolution remote sensing images from ZY3 and GF-2 satellites from 2013 to 2017 were used to extract cage culture information and analyze its dynamic characteristics. Moreover, suggestions for monitoring cage culture in Danjiangkou Reservoir were proposed. Our research showed that: (1) In general, the total area of cage culture in the reservoir area decreased year by year. The total area reduced to about a quarter in 2017 compared with that in 2013. (2) Taking 2014 as the key time node, the cage culture area increased slightly before 2014 and continued to decrease after 2014. It was related to the enhancement of water quality management because of the water supply of the South-to-North Water Diversion Project at the end of 2014. (3) It was recommended to monitor the water source protection area once a year. Cage culture should be monitored at least twice a year in the key protection area.