Estimate of Chlorophyll-a and total organic carbon concentrations in reservoirs in the brazilian semi-arid-climate regions through remote sensing using OLI/LANDSAT-8 sensor images

被引：1

作者：

De-Carvalho, Herbster ^{[1
]}

Henry-Silva, Gustavo ^{[2
]}

机构：

[1] Inst Brasileiro Meio Ambiente & Recursos Nat Reno, Brasilia, DF, Brazil

[2] Univ Fed Rural Semi Arido, Mossoro, RN, Brazil

来源：

BOLETIN GOIANO DE GEOGRAFIA | 2022年 / 42卷 / 01期

关键词：

Drainage Basin; Optically-Active Variables; Satellite Image; Limnological Variables; WATER-QUALITY; DYNAMICS; CDOM;

D O I：

10.5216/BGG.v42.67672

中图分类号：

P9 [自然地理学]; K9 [地理];

学科分类号：

0705 ; 070501 ;

摘要：

The purpose of the study was to estimate the chlorophyll-a (Chl-a) and total organic carbon (TOC) concentration through remote sensing (OLI/LANDSAT-8 - LS8). During 2017 and 2018, water was collected six times from the Umari and Mendubim reservoirs, located in the semi-arid climate regions of the Brazilian Northeast area, so as to determine the Chia and TOC values. Correlation coefficients between the spectral bands of OLI/LS8 images and the Chl-a and TOC values were calculated to select the bands to be used in simple and multiple linear regressions between the reflectance values and the limnological variable values. A correlation was found between the field data and the values estimated from the combination of B4 and B5 bands for Chl-a (R-2=0.87), and B2 and B5 for TOC (R-2=0.80). A correlation was found between the data obtained in the reservoirs and recovered from the OLI/LS8 images, with correlation coefficients of 0.76 for Chl-a and 0.71 for TOC in Umari, and 0.78 for Chl-a and 0.72 for TOC in Mendubim. The models were efficient in the Chl-a and TOC estimates in the environments studies, showing the feasibility of image use in the remote monitoring of these limnological variables in reservoirs located in the semi -arid -climate regions of Brazil.

引用

页数：24