River discharge
Satellite(s)ENVISAT, Jason-2 and -3, Sentinel-3A, CryoSat-2, and AltiKa. Landsat-8. | Monitoring elementWater surface height and water slope. |
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Description techniqueZakharova et al. (2020) use a water mask defined from Level 1 Landsat 8 images using a Modified Normalized Difference Water Index. They combine two methods to estimate discharge from altimetric measurements: the rating curve and the Manning methods. | Accuracy / Resolution
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Case studyTwo Arctic rivers (the Ob and Pur), western Siberia. | |
BenefitsThe method provides higher discharge accuracy than previous studies relying on satellite measurements, on numerical modelling or on their combination. | Limitations
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Applicability for NorthlandYes, possibly depending on the resolution of imagery available and characteristics of the rivers of interest. | |
Publication referencesZakharova E, Nielsen K, Kamenev G, Kouraev A. 2020. River discharge estimation from radar altimetry: Assessment of satellite performance, river scales and methods. Journal of Hydrology. 583:124561. doi:10.1016/j.jhydrol.2020.124561. | |
Other comments or informationThe accuracy of discharge estimation from altimetric satellite observations depends on the accuracy of the satellite-retrieved variables (water height and water slope), the accuracy of the algorithm parameterisation | |
Other references Hou J, van Dijk AIJM, Beck HE. 2020. Global satellite-based river gauging and the influence of river morphology on its application. Remote Sensing of Environment. 239:111629. doi:10.1016/j.rse.2019.111629. Feng D, Gleason CJ, Yang X, Pavelsky TM. 2019. Comparing Discharge Estimates Made via the BAM Algorithm in High-Order Arctic Rivers Derived Solely From Optical CubeSat, Landsat, and Sentinel-2 Data. Water Resources Research. 55(9):7753-7771. doi:10.1029/2019WR025599. https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019WR025599
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