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Application of Sentinel-1A Synthetic Aperture Radar Datasets for the Estimation of Stream Flow in Various Sections of the Sone River

Application of Sentinel-1A Synthetic Aperture Radar Datasets for the Estimation of Stream Flow in... The purpose of this paper is to establish relationships between stream flow and extracted water surface area for Koelwar, Indrapuri U/s and D/s gauging stations of the Sone River, Bihar. To build and validate the models, a collection of ESA Sentinel-1A high resolution multi-temporal SAR images from the European Space Agency and observed stream flow data from the Central Water Commission were acquired for three gauging stations. For the analysis, the threshold intensity of 13.8 dB is selected as an optimum value for the delineation of the water surface area with an R-value of 0.826. A power-law relationship between the series of water areas and the corresponding river discharge was established for three selected gauging sites and the performances of the developed models were compared with NSE and RMSE indices. A clear relationship is developed for all three-gauge stations out of which one is hindered with hydraulic structure (Indrapuri D/s). The NSE ranges from 0.844 to 0.909 during calibration period, 0.869–0.995 during testing period and 0.617–0.979 during validation period for the three selected gauging stations. The RMSE values also show very promising results. It is suggested from the results that SAR images can be a better alternative for hydrological analysis. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of The Institution of Engineers (India):Series A Springer Journals

Application of Sentinel-1A Synthetic Aperture Radar Datasets for the Estimation of Stream Flow in Various Sections of the Sone River

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References (42)

Publisher
Springer Journals
Copyright
Copyright © The Institution of Engineers (India) 2022
ISSN
2250-2149
eISSN
2250-2157
DOI
10.1007/s40030-022-00669-7
Publisher site
See Article on Publisher Site

Abstract

The purpose of this paper is to establish relationships between stream flow and extracted water surface area for Koelwar, Indrapuri U/s and D/s gauging stations of the Sone River, Bihar. To build and validate the models, a collection of ESA Sentinel-1A high resolution multi-temporal SAR images from the European Space Agency and observed stream flow data from the Central Water Commission were acquired for three gauging stations. For the analysis, the threshold intensity of 13.8 dB is selected as an optimum value for the delineation of the water surface area with an R-value of 0.826. A power-law relationship between the series of water areas and the corresponding river discharge was established for three selected gauging sites and the performances of the developed models were compared with NSE and RMSE indices. A clear relationship is developed for all three-gauge stations out of which one is hindered with hydraulic structure (Indrapuri D/s). The NSE ranges from 0.844 to 0.909 during calibration period, 0.869–0.995 during testing period and 0.617–0.979 during validation period for the three selected gauging stations. The RMSE values also show very promising results. It is suggested from the results that SAR images can be a better alternative for hydrological analysis.

Journal

Journal of The Institution of Engineers (India):Series ASpringer Journals

Published: Dec 1, 2022

Keywords: River discharge; Water area; Sentinel-1A; SAR; NSE

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