International Journal of Applied Earth Observations and Geoinformation (Apr 2023)

Proposition of LULC mapping in progressive detailing for the surroundings of hydroelectric powerplant reservoirs: Case study for the Batalha (Brazil)

  • Izaias de Souza Silva,
  • Diego Tarley Ferreira Nascimento,
  • Patrícia de Araújo Romão,
  • Gladis de Fatima Nunes da Silva,
  • Maurício Martines Sales,
  • Marta Pereira da Luz

Journal volume & issue
Vol. 118
p. 103218

Abstract

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Surroundings of hydroelectric powerplant reservoirs have peculiar conditions of land use dynamics. In this sense, the objective of this work is to provide a methodological proposal for mapping the land use and land cover (LULC) in progressive detailing of surroundings of reservoirs of Hydroelectric Power Plants (HPP). To achieve this objective, we're mapped Batalha HPP (Brazil) as a case study. The approach to mapping LULC with progressive detailing consisted of three successive and complementary stages: the first, of reconnaissance (1:100,000), is based on the use of secondary cartographic and census data for the period 1985 to 2020, contemplating the Area of Direct Influence (ADI) of the Batalha HPP reservoir; the second stage, of semi-detail (1:25,000), consists of the use of Sentinel 2 images from the year 2021, spectral indices and the incorporation of manually vectorized files, for the spatial clipping of the Direct Contribution Basins (DCBs) and; the third and final step, of detail (1:10,000), made use of merged CBERS 4A images with a spatial resolution of 2 m analyzing the Limit of the Immediate Margins (LIM) of the reservoir. The data from the reconnaissance stage showed a clear dynamic of LULC change between 1985 and 2020 in the ADI of the Batalha HPP reservoir, with reduction and fragmentation of vegetation, due to the incorporation of areas for pasture and mainly, agriculture. In the semi-detail stage, the data showed that the DCBs of the reservoir of Batalha HPP were mainly related to agricultural use. The last step, of detail for the analysis of LIM, portrayed a condition of greater protection of the margins by vegetation cover, due to proximity to reservoirs. Due to the overall accuracy of 0.87, 0.95, and 0.91, respectively, the mapping of LULC changes in the three subsequent steps showed very good performance.

Keywords