Application of sentinel-1a synthetic aperture radar datasets for the estimation of stream flow in various sections of the sone river
By: Harsh Kumar
.
Contributor(s): Thendiyath, Roshni.
Publisher: USA Springer 2022Edition: Vol.103(4), Dec.Description: 1005-1014p.Subject(s): Humanities and Applied SciencesOnline resources: Click here
In:
Journal of the institution of engineers (India): Series ASummary: 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.
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School of Engineering & Technology Archieval Section | Not for loan | 2023-0340 |
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.
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