Determination of duration, threshold and spatiotemporal distribution of extreme continuous precipitation in nine major river basins in China

Atmospheric Research, Journal Year: 2023, Volume and Issue: 300, P. 107217 - 107217

Published: Dec. 31, 2023

Language: Английский

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An Ensemble Machine Learning Model to Estimate Urban Water Quality Parameters Using Unmanned Aerial Vehicle Multispectral Imagery

Remote Sensing, Journal Year: 2024, Volume and Issue: 16(12), P. 2246 - 2246

Published: June 20, 2024

Urban reservoirs contribute significantly to human survival and ecological balance. Machine learning-based remote sensing techniques for monitoring water quality parameters (WQPs) have gained increasing prominence in recent years. However, these still face challenges such as inadequate band selection, weak machine learning model performance, the limited retrieval of non-optical active (NOAPs). This study focuses on an urban reservoir, utilizing unmanned aerial vehicle (UAV) multispectral ensemble (EML) methods monitor optically (OAPs, including Chla SD) non-optically (including CODMn, TN, TP), exploring spatial temporal variations WQPs. A framework Feature Combination Genetic Algorithm (FC-GA) is developed feature along with two frameworks EML models WQP estimation. Results indicate FC-GA’s superiority over popular Pearson correlation coefficient recursive elimination, achieving higher performance no multicollinearity between bands. The demonstrates superior estimation capabilities WQPs like Chla, SD, TP, R2 0.72–0.86 MRE 7.57–42.06%. Notably, exhibits greater accuracy estimating OAPs (MRE ≤ 19.35%) compared NOAPs 42.06%). Furthermore, distributions reveal nitrogen phosphorus nutrient pollution upstream head downstream tail reservoir due activities. are lower dry season than rainy season, while clarity CODMn season. proposes a novel approach monitoring, aiding identification potential sources management.

Language: Английский

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Impact of Landscape Patterns on Water Quality in Urbanized Rivers at Characteristic Scale: A Case of Pearl River Delta, China

Environmental Management, Journal Year: 2024, Volume and Issue: 74(4), P. 715 - 728

Published: July 20, 2024

Language: Английский

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A novel daily-scale index for detecting drought-flood abrupt alternation events: Proof from Pearl River Basin, China

Atmospheric Research, Journal Year: 2024, Volume and Issue: unknown, P. 107892 - 107892

Published: Dec. 1, 2024

Language: Английский

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