Estimate the storage capacity of Song Tranh 2 hydropower reservoir using Sentinel data

Abstract

Besides the role of providing water to produce electricity for the national power system, hydroelectric reservoirs also ensure the harmony of economic, social and environmental benefits. However, climate change and prolonged heat waves have caused hydroelectric reservoirs to dry up. Therefore, monitoring the storage capacity of reservoir to serve water resource
management has become more urgent than ever. The use of Sentinel 1 satellite images, water level data and digital elevation model (DEM) has allowed to accurately estimate the storage capacity of Song Tranh 2 hydroelectric reservoir (Quang Nam). The results show that the water capacity reached 692.1 km3 corresponding to the water level of 172.45 m on May 28, 2022 when radar image was taken. Validation with actual observed capacity (691.2 km3) shows that the error is less than 2%. This study contributes to demonstrate the ability to use remote sensing data in monitoring water level in reservoirs. From there, it allows  forecasting to make appropriate strategies for using water resources and producing electrical energy at Song Tranh 2
hydroelectric reservoir.

Keywords: Reservoir; volume; DEM; Sentinel; Song Tranh 2.