DEVELOPING AN INNOVATIVE TECHNIQUE TO ENABLE ESTIMATE OF SURFACE AREA AND VOLUME OF ASWAN HIGH DAM LAKE USING SATELLITE IMAGES

Abstract

Lake Surface area = 8.12548* 10-12 * (WL) 6.589258217Km2 The integration of the lake surface area equation is used to obtain the lake volume equation as a function of WL as follows: This study focused on developing an innovative technique that enables the accurate calculation of the lake water surface area and volume at any specific time using satellite images. To achieve the objectives of the study, many water Indices of image-processing techniques were investigated to accurately delineate the High Aswan Dam reservoir (HADR) water body boundary. The study shows that the MNDWI is most useful technique to delineate water surface from other land features. The processing of Landsat-8 and setienal-2 satellites images for the purposes of this research -water surface delineation- shows very high degree of consistency for the scale up to 1:50,000. The calculation of water body is applied for all satellite data coverages representing the lake surface area in different dates in the years 2015, 2016 and 2021 using 41 scenes from both satellites (Lansat-8 and sentinel-2). The 41 scenes are chosen from more than 150 scenes downloaded to select the proper scenes representing the nine complete lake surface coverages. The selected nine dates images were representing different lake levels varies from 173.49 to 181.24 meters which corresponds to the surveyed data by HYDROWEB project. Analyzing the water levels as a variable and the corresponding lake surface area, lead to a new mathematical power equation. The equation found to fit a curve that represents the relation between the water level (WL) and surface area with a very good -proportional of variance statistical measure- R2 value of 0.997 as follows.