Integrating historical topographic maps and SRTM data to derive the bathymetry of a tropical reservoir

Author(s)

Alcantara, Enner ^[1] ; Novo, Evlyn ^[1] ; Stech, Jose ^[1] ; Assireu, Arcilan ^[1] ; Nascimento, Renata ^[1] ; Lorenzzetti, Joao ^[1] ; Souza, Arley ^{[1, 2]}

Affiliation

^[1] Brazilian Inst Space Res, Remote Sensing Div, Sao Jose Dos Campos - Brazil

^[2] CETEC ETEP Fac, Sao Jose Dos Campos - Brazil

• Document type: Journal article
• Source: Journal of Hydrology; v. 389, n. 3-4, p. 311-316, AUG 11 2010.
• Web of Science Citations: 3

Abstract

This paper proposes a fast and inexpensive method for estimating the bathymetry of hydroelectric reservoirs. Brazil has more than 30 large hydroelectric reservoirs with a combined volume exceeding one billion cubic meters. The hydroelectric sector is responsible for 97% of the energy production in Brazil and is the largest hydroelectric park in the world. Among the variables affecting the environmental impacts of reservoirs, depth plays a major role because it influences the aquatic system hydrodynamics. Reservoir depth distribution (i.e., the bathymetry) is also a fundamental factor controlling the physical-chemical and biological properties of the system. However, the acquisition of bathymetric information for the large reservoirs in Brazil is not a simple task because: (1) most of the topographic maps available in the area of the lake have a very small scale (1:100,000 and smaller), (2) larger charts are the property of the hydropower companies and are classified, and (3) the size of the reservoirs prevent the use of bathymetric surveys. The proposed method of integrating historical and Shuttle Radar Topography Mission (SRTM) topographic data allowed for the estimation of the bathymetry of the Itumbiara reservoir with R(2) = 0.98 (n = 100, p = 0.00) and RMSE = 3.78 m. For researchers who need a rapid and simple method to develop bathymetric maps of hydroelectric reservoirs, the proposed method can provide a simple and fast alternative to more data intensive methods. (C) 2010 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 07/08103-2 - Study of circulation, water quality and land use in the Itumbiara Reservoir hydrographic basin
• Grantee: José Luiz Stech
• Support Opportunities: Regular Research Grants