Open AccessRemote Sensing Retrieval and Evaluation of Chlorophyll-a Concentration in East Dongting Lake, China
Author(s) -
Xi Chen,
Mingwu Ou,
Jianqiang Shi,
Ying Li
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/668/1/012035
Subject(s) - environmental science , chlorophyll a , hydrology (agriculture) , china sea , eutrophication , flood myth , algal bloom , shore , algae , phytoplankton , oceanography , geography , ecology , nutrient , biology , geology , botany , archaeology , geotechnical engineering
Using Landsat 8 OLI remote sensing images in November 2016, October 2017 and December 2017, relevant quantitative remote sensing statistical models were adopted under the ENVI software platform to invert and evaluate the chlorophyll-a (Chl-a) concentration in East Dongting Lake, China. The results show that from 2016 to 2017, the maximum concentration of Chl-a was 28 mg/m 3 , with an average of 16 mg/m 3 . The water temperature is relatively high in summer, and the photosynthesis of algae is enhanced, which is conducive to the growth and reproduction of algae. The concentration is relatively high in flood season, and the non-flood season is relatively low. In the northwest of East Dongting Lake, there is no free exchange of water with the shore, and the water in the lake has a relatively low purification capacity for pollutants; Chl-a concentration in this region is higher than that in other regions, while the water in the channel connecting South Dongting Lake has strong fluidity with low concentration. In the flood season of July 2017, the trophic state index (TSI) value of the west inshore side of the lake can reach 60-70, and there is a problem of water bloom. The TSI of non-flood season is 40-50. The degree of eutrophication has decreased recently, which should be related to the overall management of water environment.