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Performance Assessment of a Bathymetry System in Open Inland Waterbodies


Affiliations
1 National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 037, India
2 Indian Institute of Remote Sensing, Indian Space Research Organisation, Dehradun 248 001, India
 

Bathymetry of an open waterbody can be estimated remotely using airborne and space-borne sensors with wide coverage. However, unmanned aerial vehicle (UAV)- borne bathymetric systems are current trends for applications with limited depth subjected to the quality of water. Estimation of accurate bathymetry using surface-based sensors is essential for validating the remote sensing-derived results. To cater to the requirements of the in situ measurement system, especially for supporting the airborne (aircraft/UAVs) remote sensing-based bathymetry systems, a customized and compact, immersion-type bathymetry system using single-frequency (typ. 500 kHz) transducer was developed in-house at the National Remote Sensing Centre (NRSC), ISRO, Hyderabad. In the present study, we assess the performance of the developed system in the field against physical measurements and a reference acoustic transducer for shallow and deep inland open waterbodies. Performance testing was carried out in the Asan Lake, a shallow waterbody, with a depth of up to 4 m and in the Tehri reservoir for deep bathymetry with a depth of more than 150 m. The results show that the estimated TVU for the developed system during shallow bathymetry assessment was 0.272 m which complies with the IHO order 1. The observed performance of the developed system was consistent with the system specifications, which advocate its utility for hydrology and water resource management applications along with its intended use to support remote sensing-based bathymetric systems

Keywords

Acoustic Transducer, Bathymetry, Echo Sounder, Waterbodies, Water-Depth Measurement.
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  • Performance Assessment of a Bathymetry System in Open Inland Waterbodies

Abstract Views: 282  |  PDF Views: 126

Authors

Satyendra S. Raghuwanshi
National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 037, India
Vaibhav Garg
Indian Institute of Remote Sensing, Indian Space Research Organisation, Dehradun 248 001, India
Bhaskar R. Nikam
Indian Institute of Remote Sensing, Indian Space Research Organisation, Dehradun 248 001, India
G. Varaprasad Babu
National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 037, India
S. Muralikrishnan
National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 037, India

Abstract


Bathymetry of an open waterbody can be estimated remotely using airborne and space-borne sensors with wide coverage. However, unmanned aerial vehicle (UAV)- borne bathymetric systems are current trends for applications with limited depth subjected to the quality of water. Estimation of accurate bathymetry using surface-based sensors is essential for validating the remote sensing-derived results. To cater to the requirements of the in situ measurement system, especially for supporting the airborne (aircraft/UAVs) remote sensing-based bathymetry systems, a customized and compact, immersion-type bathymetry system using single-frequency (typ. 500 kHz) transducer was developed in-house at the National Remote Sensing Centre (NRSC), ISRO, Hyderabad. In the present study, we assess the performance of the developed system in the field against physical measurements and a reference acoustic transducer for shallow and deep inland open waterbodies. Performance testing was carried out in the Asan Lake, a shallow waterbody, with a depth of up to 4 m and in the Tehri reservoir for deep bathymetry with a depth of more than 150 m. The results show that the estimated TVU for the developed system during shallow bathymetry assessment was 0.272 m which complies with the IHO order 1. The observed performance of the developed system was consistent with the system specifications, which advocate its utility for hydrology and water resource management applications along with its intended use to support remote sensing-based bathymetric systems

Keywords


Acoustic Transducer, Bathymetry, Echo Sounder, Waterbodies, Water-Depth Measurement.

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DOI: https://doi.org/10.18520/cs%2Fv124%2Fi5%2F585-590