Diel and seasonal mixing patterns and water quality dynamics in a multipurpose tropical semiarid reservoir DOI Creative Commons
Maria Aparecida Melo Rocha, Mário Ubirajara Gonçalves Barros, Francisco de Assis de Souza Filho

et al.

Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: Dec. 19, 2023

Abstract Eutrophication has become a recurrent concern in reservoirs worldwide. This problem is intensified tropical semiarid regions, where the have high seasonal and annual variability of water level volume. Therefore, an extensive understanding diel variation quality key-parameters can help improve management such reservoirs. study focuses on Castanhão reservoir, largest multipurpose dam Brazilian semiarid. Its main uses are irrigation, fish farming, human supply. The reservoir faced decline due to prolonged drought period. While previous research predominantly emphasized dynamics thermal chemical stratification, our investigation provides assessments multiple parameters, including nutrient concentrations phytoplankton abundance. Our primary objective compare variations stratification distribution within reservoir. Key findings reveal cycle primarily during dry season, driven by higher wind speeds. corroborated significant negative correlation between speed relative column stability index. In contrast, rainy experiences continuous inflowing being warmer than reservoir’s temperature. Notably, total phosphorus chlorophyll-a, along with two-fold increase this throughout day underscores influence community variation. Chemical dissolved oxygen occurred seasons, indicating that even there no inflow, internal loading also significantly impact advances reservoirs, shedding light both climatic anthropogenic influences resources.

Language: Английский

An Approach for Monitoring Chlorophyll-A and Turbidity Levels in Saduperi and Kaveripakkam Lakes Located in and Around Vellore Region, Tamil Nadu, India, Using Spectral Unmixing Technique DOI

Mageswaran Raghul,

P. Porchelvan

Journal of the Indian Society of Remote Sensing, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 27, 2024

Language: Английский

Citations

1
Chlorophyll-a Estimation in 149 Tropical Semi-Arid Reservoirs Using Remote Sensing and Machine Learning DOI Open Access
Victor Oliveira Santos, Bruna Monallize Duarte Moura Guimarães, Iran Eduardo Lima Neto

et al.

Published: Dec. 25, 2023

Eutrophication, a global concern, impacts water quality, ecosystems, and human health. It’s crucial to monitor algal blooms in freshwater reservoirs, as they indicate the trophic condition of waterbody through Chlorophyll-a (Chla) concentration. Traditional monitoring methods, however, are expensive time-consuming. Addressing this hindrance, we developed models using remotely sensed data from Sentinel-2 satellite for large-scale coverage, including its bands spectral indexes, estimate Chla concentration on 149 reservoirs state Ceará, Brazil. Several machine learning models, k-nearest neighbours, random forests, extreme gradient boosting, least absolute shrinkage, group method handling (GMDH), support vector were trained tested. A stepwise approach determined best subset input parameters. The best-performing model was GMDH, achieving an R2 0.91 RMSE 20.38 mg/L, which is value consistent with ones found literature. Nevertheless, predicted values most sensitive red, green, near infra-red bands.

Language: Английский

Citations

2
Diel and seasonal mixing patterns and water quality dynamics in a multipurpose tropical semiarid reservoir DOI Creative Commons
Maria Aparecida Melo Rocha, Mário Ubirajara Gonçalves Barros, Francisco de Assis de Souza Filho

et al.

Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: Dec. 19, 2023

Abstract Eutrophication has become a recurrent concern in reservoirs worldwide. This problem is intensified tropical semiarid regions, where the have high seasonal and annual variability of water level volume. Therefore, an extensive understanding diel variation quality key-parameters can help improve management such reservoirs. study focuses on Castanhão reservoir, largest multipurpose dam Brazilian semiarid. Its main uses are irrigation, fish farming, human supply. The reservoir faced decline due to prolonged drought period. While previous research predominantly emphasized dynamics thermal chemical stratification, our investigation provides assessments multiple parameters, including nutrient concentrations phytoplankton abundance. Our primary objective compare variations stratification distribution within reservoir. Key findings reveal cycle primarily during dry season, driven by higher wind speeds. corroborated significant negative correlation between speed relative column stability index. In contrast, rainy experiences continuous inflowing being warmer than reservoir’s temperature. Notably, total phosphorus chlorophyll-a, along with two-fold increase this throughout day underscores influence community variation. Chemical dissolved oxygen occurred seasons, indicating that even there no inflow, internal loading also significantly impact advances reservoirs, shedding light both climatic anthropogenic influences resources.

Language: Английский

Citations

0