EGU21-14327
https://doi.org/10.5194/egusphere-egu21-14327
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Sentinel-2 mission Contribution for Supporting Bathymetric layers of SAFAGA coastal zone, Egypt

Ramez Saeed1, Saad Abdelrahman2, Andrea Scozari3, and Abdelazim Negm4
Ramez Saeed et al.
  • 1Arab Academy for Science, Technology, and Maritime Transport, Maritime Transport, hydrographic surveying, Egypt (ramez.saied2014@gmail.com)
  • 2Arab Academy for Science, Technology, and Maritime Transport, Maritime Transport, Oceanography and coastal Engineering, Egypt (saad.mesbah@aast.edu )
  • 3National Research Council of Italy,Institute of Information Science and technologies, Italy (a.scozzari@isti.cnr.it)
  • 4Zagazig University, Faculty of engineering, Water and water Structures Engineering Dept, Egypt (amnegm85@yahoo.com)

ABSTRACT

With the fast and highly growing demand for all possible ways of remote work as a result of COVID19 pandemic, new technologies using Satellite data were highly encouraged for multidisciplinary applications in different fields such as; agriculture, climate change, environment, coastal management, maritime, security and Blue Economy.

This work supports applying Satellite Derived Bathymetry (SDB) with the available low-cost multispectral satellite imagery applications, instruments and readily accessible data for different areas with only their benthic parameters, water characteristics and atmospheric conditions.  The main goal of this work is to derive bathymetric data needed for different hydrographic applications, such as: nautical charting, coastal engineering, water quality monitoring, sediment movement monitoring and supporting both green carbon and marine data science.  Also, this work proposes and assesses a SDB procedure that makes use of publicly-available multispectral satellite images (Sentinel2 MSI) and applies algorithms available in the SNAP software package for extracting bathymetry and supporting bathymetric layers against highly expensive traditional in-situ hydrographic surveys. The procedure was applied at SAFAGA harbor area, located south of Hurghada at (26°44′N, 33°56′E), on the Egyptian Red Sea coast.  SAFAGA controls important maritime traffic line in Red Sea such as (Safaga – Deba, Saudi Arabia) maritime cruises.  SAFAGA depths change between 6 m to 22m surrounded by many shoal batches and confined waters that largely affect maritime safety of navigation.  Therefore, there is always a high demand for updated nautical charts which this work supports.  The outcome of this work provides and fulfils those demands with bathymetric layers data for the approach channel and harbour usage bands electronic nautical chart of SAFAGA with reasonable accuracies.  The coefficient of determination (R2) differs between 0.42 to 0.71 after applying water column correction by Lyzenga algorithm and deriving bathymetric data depending on reflectance /radiance of optical imagery collected by sentinel2 missions with in-situ depth data values relationship by Stumpf equation.  The adopted approach proved to give  highly reasonable results that could be used in nautical charts compilation. Similar methodologies could be applied to inland water bodies.  This study is part of the MSc Thesis of the first author and is in the framework of a bilateral project between ASRT of Egypt and CNR of Italy which is still running.

Keywords: Algorithm, Bathymetry, Sentinel 2, nautical charting, Safaga port, satellite imagery, water depth, Egypt.

How to cite: Saeed, R., Abdelrahman, S., Scozari, A., and Negm, A.: Sentinel-2 mission Contribution for Supporting Bathymetric layers of SAFAGA coastal zone, Egypt, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-14327, https://doi.org/10.5194/egusphere-egu21-14327, 2021.