Bathymetric and Capacity Relationships Based on Sentinel-3 Mission Data for Aswan High Dam Lake, Egypt  
[PERSON]  
1 Civil Engineering Department, Faculty of Engineering, Aswan University, Aswan 81528, Egypt; [EMAIL_ADDRESS] (H.H. ); [EMAIL_ADDRESS] (M.E.) [PERSON]  
1 Civil Engineering Department, Faculty of Engineering, Aswan University, Aswan 81528, Egypt; [EMAIL_ADDRESS] (H.H. ); [EMAIL_ADDRESS] (M.E.) [PERSON]  
2 Civil Engineering Department, Arab Academy for Science Technology & Maritime Transport, Aswan 1029, Egypt; [EMAIL_ADDRESS] 2  
[PERSON]  
3 Institute of Information Science and Technologies (CNR-ISIT), National Research Council of Italy, 56124 Pisa, Italy 3*Water and Water structures Department, Faculty of Engineering, Zagazig University, Zagazig 44519, Egypt 3*Correspondence: [EMAIL_ADDRESS] (M.K. ); [EMAIL_ADDRESS] (A.S.); [EMAIL_ADDRESS] (A.N. ); Tel. : +2-011-2755-9397 (M.K. ); +2-010-0573-5345 (A.N.) [PERSON]  
44 Water and Water structures Department, Faculty of Engineering, Zagazig University, Zagazig 44519, Egypt 44519, Egypt 44519, Egypt 44519, Egypt 44519, Egypt 44519, Egypt 44519, Egypt 44519, Egypt 44519, Egypt 44519, Egypt 44519, Egypt 44519, Egypt 44519, Egypt 4519, Egypt 44519, Egypt  
bodies. Several research papers have proposed approaches to mapping water bodies from satellite imagery and have provided useful tools for studying bodies of water with large spatial extensions, such as AHDL [3]. Sentinel-3 is a European satellite constellation carrying wide-swath, medium-resolution, multi-spectral imaging sensors, in addition to a radar altimeter. Sentinel-3 was mainly designed to monitor ocean surface topography, land and sea surface temperature, as well as ocean and land color, thus the main objective of the Sentinel-3 mission is to support operational services, in the frame of ocean forecasting systems, environmental monitoring, and climate monitoring [4]. The satellite hosts four instruments: The Sea and Land Surface Temperature Radiometer (SLSTR), the Ocean and Land Color Instrument (OLCI), a SAR Radar Altimeter (SRAL), and a Microwave Radiometer (MWR). Hundreds of peer-reviewed publications have demonstrated promising remote sensing models to estimate biological, chemical, and physical properties of inland water bodies (see, for example, [5]). Sentinel-3A was launched on 16 February 2016 and its twin Sentinel-3B on 25 April 2018. European Space Agency (ESA) and the European Organization for the Exploitation of Meteorological Satellites (EUMETSAT) provide operational ocean and land observation services and jointly operate the constellation. Until recently, most of these publications focused largely on algorithm development instead of implementing those algorithms to address specific science questions [6]. Over the last three decades, radiometry images have been evaluated as one of the highest potential alternatives to depth estimation for its wide coverage of the area, receptivity, and low cost. Recently, various researchers have used Landsat8, Spot5, Worldview 2, and ERS data for depth retrieval using various algorithms for coastal areas [7; 8; 9; 10]. In this paper, spectral reflectance characteristics of the water have been extracted from radiometric images and correlated with on-site data measurements to analyze spatial and temporal changes of characteristics and water depth. Lyzenga [11] enhances multiple linear regression, which required knowledge of the optical properties of the water at the time of image acquisition. [PERSON] [12] developed the Lyzenga methodology by utilizing a ratio transformation using the blue/green spectral bands for estimating depth and assumed that depth driven change is larger than the corresponding benthic albedo-driven change. This method has been adapted and widely applied to the bathymetric mapping of shallow marine environments [13; 14].