Remotely observed variations of reservoir low concentration chromophoric dissolved organic matter and its response to upstream hydrological and meteorological conditions using Sentinel-2 imagery and Gradient Boosting Regression Tree

Freshwater lakes are facing increasingly serious water quality problems. Remote sensing techniques are effective tools for monitoring spatiotemporal information of chromophoric dissolved organic matter (CDOM), a biochemical indicator for water quality. In this study, the Gradient Boosting Regression...

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Autores principales:	Zeliang Zhang, Weining Zhu, Jiang Chen, Qian Cheng
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	cdom gbrt remote sensing reservoir sentinel-2 Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/250841a9c76b407bbbecf23d1c5e8f45
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spelling	oai:doaj.org-article:250841a9c76b407bbbecf23d1c5e8f452021-11-06T07:09:23ZRemotely observed variations of reservoir low concentration chromophoric dissolved organic matter and its response to upstream hydrological and meteorological conditions using Sentinel-2 imagery and Gradient Boosting Regression Tree1606-97491607-079810.2166/ws.2020.342https://doaj.org/article/250841a9c76b407bbbecf23d1c5e8f452021-03-01T00:00:00Zhttp://ws.iwaponline.com/content/21/2/668https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798Freshwater lakes are facing increasingly serious water quality problems. Remote sensing techniques are effective tools for monitoring spatiotemporal information of chromophoric dissolved organic matter (CDOM), a biochemical indicator for water quality. In this study, the Gradient Boosting Regression Tree (GBRT) model and Sentinel-2A/B imagery were combined to estimate low CDOM concentrations (0.003 m−1 < aCDOM(440) <1.787 m−1) in Xin'anjiang Reservoir, an important drinking water resource in Zhejiang Province, China, providing the CDOM distributions and dynamics with high spatial (10 m) and temporal (5 day) resolutions. The possible environmental factors that may affect CDOM spatiotemporal patterns and dynamics were analyzed using Sentinel-2 image-observed data in 2018. Results showed that CDOM in the reservoir exhibited a clear increased gradient from its transition and lacustrine zones to the riverine zones, indicating that the rivers carried a substantial load of organic matter to the lake. The precipitation may increase CDOM concentrations but it has a delayed effect, while it may also shortly decrease CDOM concentrations due to the rainwater dilution. We also found that the correlations between CDOM and water temperature, air pressure, and wind speed were very low, indicating that these factors may not have significant impacts on CDOM variations in the reservoir. This study demonstrated that the GBRT model and Sentinel-2 imagery have the potential to accurately monitor CDOM spatiotemporal variations in reservoirs with low CDOM concentrations, which advances our understanding on the relations between the dissolved organic matter and its coupling environmental factors in river-reservoir systems. HIGHLIGHTS Low-concentration reservoir CDOM (chromophoric dissolved organic matter) can be estimated by using Sentinel-2 images and machine learning.; The GBRT (Gradient Boosting Regression Tree) method performed much better than other traditional and machine learning methods.; The satellite observed CDOM variations demonstrated some correlations to the upstream hydrological and meteorological conditions of the reservoir.;Zeliang ZhangWeining ZhuJiang ChenQian ChengIWA Publishingarticlecdomgbrtremote sensingreservoirsentinel-2Water supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 2, Pp 668-682 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cdom gbrt remote sensing reservoir sentinel-2 Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	cdom gbrt remote sensing reservoir sentinel-2 Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Zeliang Zhang Weining Zhu Jiang Chen Qian Cheng Remotely observed variations of reservoir low concentration chromophoric dissolved organic matter and its response to upstream hydrological and meteorological conditions using Sentinel-2 imagery and Gradient Boosting Regression Tree
description	Freshwater lakes are facing increasingly serious water quality problems. Remote sensing techniques are effective tools for monitoring spatiotemporal information of chromophoric dissolved organic matter (CDOM), a biochemical indicator for water quality. In this study, the Gradient Boosting Regression Tree (GBRT) model and Sentinel-2A/B imagery were combined to estimate low CDOM concentrations (0.003 m−1 < aCDOM(440) <1.787 m−1) in Xin'anjiang Reservoir, an important drinking water resource in Zhejiang Province, China, providing the CDOM distributions and dynamics with high spatial (10 m) and temporal (5 day) resolutions. The possible environmental factors that may affect CDOM spatiotemporal patterns and dynamics were analyzed using Sentinel-2 image-observed data in 2018. Results showed that CDOM in the reservoir exhibited a clear increased gradient from its transition and lacustrine zones to the riverine zones, indicating that the rivers carried a substantial load of organic matter to the lake. The precipitation may increase CDOM concentrations but it has a delayed effect, while it may also shortly decrease CDOM concentrations due to the rainwater dilution. We also found that the correlations between CDOM and water temperature, air pressure, and wind speed were very low, indicating that these factors may not have significant impacts on CDOM variations in the reservoir. This study demonstrated that the GBRT model and Sentinel-2 imagery have the potential to accurately monitor CDOM spatiotemporal variations in reservoirs with low CDOM concentrations, which advances our understanding on the relations between the dissolved organic matter and its coupling environmental factors in river-reservoir systems. HIGHLIGHTS Low-concentration reservoir CDOM (chromophoric dissolved organic matter) can be estimated by using Sentinel-2 images and machine learning.; The GBRT (Gradient Boosting Regression Tree) method performed much better than other traditional and machine learning methods.; The satellite observed CDOM variations demonstrated some correlations to the upstream hydrological and meteorological conditions of the reservoir.;
format	article
author	Zeliang Zhang Weining Zhu Jiang Chen Qian Cheng
author_facet	Zeliang Zhang Weining Zhu Jiang Chen Qian Cheng
author_sort	Zeliang Zhang
title	Remotely observed variations of reservoir low concentration chromophoric dissolved organic matter and its response to upstream hydrological and meteorological conditions using Sentinel-2 imagery and Gradient Boosting Regression Tree
title_short	Remotely observed variations of reservoir low concentration chromophoric dissolved organic matter and its response to upstream hydrological and meteorological conditions using Sentinel-2 imagery and Gradient Boosting Regression Tree
title_full	Remotely observed variations of reservoir low concentration chromophoric dissolved organic matter and its response to upstream hydrological and meteorological conditions using Sentinel-2 imagery and Gradient Boosting Regression Tree
title_fullStr	Remotely observed variations of reservoir low concentration chromophoric dissolved organic matter and its response to upstream hydrological and meteorological conditions using Sentinel-2 imagery and Gradient Boosting Regression Tree
title_full_unstemmed	Remotely observed variations of reservoir low concentration chromophoric dissolved organic matter and its response to upstream hydrological and meteorological conditions using Sentinel-2 imagery and Gradient Boosting Regression Tree
title_sort	remotely observed variations of reservoir low concentration chromophoric dissolved organic matter and its response to upstream hydrological and meteorological conditions using sentinel-2 imagery and gradient boosting regression tree
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/250841a9c76b407bbbecf23d1c5e8f45
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Remotely observed variations of reservoir low concentration chromophoric dissolved organic matter and its response to upstream hydrological and meteorological conditions using Sentinel-2 imagery and Gradient Boosting Regression Tree

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