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Investigation on River Thermal Regime under Dam Influence by Integrating Remote Sensing and Water Temperature Model

State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
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Water 2021, 13(2), 133; https://doi.org/10.3390/w13020133
Received: 1 December 2020 / Revised: 30 December 2020 / Accepted: 6 January 2021 / Published: 8 January 2021
(This article belongs to the Section Biodiversity and Ecosystem Functioning)
River water temperature (RWT), a primary parameter for hydrological and ecological processes, is influenced by both climate change and anthropogenic intervention. Studies on such influences have been severely restricted due to the scarcity of river temperature data. This paper proposed a three-stage method to obtain long-term daily water temperature for rivers and river-type reservoirs by integrating remote sensing technique and river water temperature modelling. The proposed three-stage method was applied to the Three Gorges Reservoir (TGR) and validated against in situ measured RWTs in the two study sites, Cuntan and Huanglingmiao. The result showed improvements in the method: the quadrate window selection and RWT correction jointly reduce RMSE from 1.8 to 0.9 °C in Cuntan and from 2.1 to 1.2 °C in Huanglingmiao. As a whole, the estimated daily RWT has a consistent RMSE of 1.1–1.9 °C. Meanwhile, by analysing the Landsat-derived daily RWT, we demonstrated that the TGR had a significant impact on the outflow’s thermal regime. At the downstream reach of TGR, an apparent increase in RWT in the cold season and interannual thermal regime delay compared to inflow were found with the increasing water level after the dam construction. All the results and analyses indicate that the proposed three-stage method could be applied to obtain long time series of daily RWT and provide a promising approach to qualitatively analyse RWT variation in the poorly gauged catchment for river water quality monitoring and management. View Full-Text
Keywords: river water temperature; Landsat; the Three Gorges Dam river water temperature; Landsat; the Three Gorges Dam
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MDPI and ACS Style

Shi, X.; Sun, J.; Xiao, Z. Investigation on River Thermal Regime under Dam Influence by Integrating Remote Sensing and Water Temperature Model. Water 2021, 13, 133. https://doi.org/10.3390/w13020133

AMA Style

Shi X, Sun J, Xiao Z. Investigation on River Thermal Regime under Dam Influence by Integrating Remote Sensing and Water Temperature Model. Water. 2021; 13(2):133. https://doi.org/10.3390/w13020133

Chicago/Turabian Style

Shi, Xi; Sun, Jian; Xiao, Zijun. 2021. "Investigation on River Thermal Regime under Dam Influence by Integrating Remote Sensing and Water Temperature Model" Water 13, no. 2: 133. https://doi.org/10.3390/w13020133

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