Development of an indicator system for solar-induced chlorophyll fluorescence monitoring to enhance early warning of flash drought

Agricultural Water Management, Journal Year: 2025, Volume and Issue: 312, P. 109397 - 109397

Published: March 9, 2025

Language: Английский

Validation of Inland Water Surface Elevation from SWOT Satellite Products: A Case Study in the Middle and Lower Reaches of the Yangtze River

Remote Sensing, Journal Year: 2025, Volume and Issue: 17(8), P. 1330 - 1330

Published: April 8, 2025

The Surface Water and Ocean Topography (SWOT) satellite mission, jointly developed by NASA several international collaboration agencies, aims to achieve high-resolution two-dimensional observations of global surface water. Equipped with the advanced Ka-band radar interferometer (KaRIn), it significantly enhances ability monitor water provides a new data source for obtaining large-scale elevation (WSE) at high temporal spatial resolution. However, accuracy applicability its scientific products inland bodies still require validation. This study obtained three from SWOT between August 2023 December 2024: Level 2 KaRIn high-rate river single-pass vector product (L2_HR_RiverSP), lake (L2_HR_LakeSP), mask pixel cloud (L2_HR_PIXC). These were compared in situ level validate their retrieving levels across eight different regions middle lower reaches Yangtze River (MLRYR) evaluate each product. experimental results show following: (1) inversion L2_HR_RiverSP L2_HR_LakeSP varies regions. In some areas, extracted WSE aligns closely trend, coefficient determination (R2) exceeding 0.9, while other R2 is (less than 0.8), error larger (with Root Mean Square Error (RMSE) greater 1.0 m). (2) proposes combined denoising method based on Interquartile Range (IQR) Adaptive Statistical Outlier Removal (ASOR). Compared products, L2_HR_PIXC product, after denoising, shows significant improvements all metrics inversion, 0.85, Absolute (MAE) less 0.4 m, RMSE 0.5 m. Overall, demonstrates capability precision, especially through which broader application potential will play an important role dynamics monitoring refined resource management research.

Language: Английский

Attribution Analysis of Water‐Sediment Nexus Changes for the Fluctuating Backwater Zone of the Three Gorges Reservoir Under Changing Environmental Conditions

River Research and Applications, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

ABSTRACT As one of the carbon neutralization or reduction strategies, constructing large hydroelectric dams leads to formation fluctuating backwater zones (FBZs). Synchronization water and sediment under impacts climatic changes human activities over FBZs is still an open question due diverse particularities zones. Taking FBZ world's largest power station, that is, Three Gorges Reservoir (TGR), as a typical example, we attempt address such in this study. Based on analyses water‐sediment characteristics, relationships, covariations, Budyko hypothesis attribution decomposition method are coupled quantitatively examine synchronization. Modeling results reveal construction cascade reservoirs dominates decrease load (e.g., 73.9% for Jialing River basin from 1985 2020), alteration runoff‐sediment relationships across FBZ. The dominator (accounting 46.01%) increasing annual average runoffs upstream wetting climate, while (64.14%) decreasing ones tributary activities; by contrast, play dominant roles (from 72.1% 98.1%) loads These findings provide scientific support addressing water‐sediment‐related issues navigational safety, deposition, environment worldwide FBZs.

Language: Английский