Simplified Estimation of Aquatic Vegetation in Ibanaiko Lagoon adjacent to Lake Biwa using drones and satellite observation

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  • ドローンと衛星観測による伊庭内湖における水草繁茂面積の簡易推定
  • ドローン ト エイセイ カンソク ニ ヨル イテイ ナイコ ニ オケル ミズクサ ハンモ メンセキ ノ カンイ スイテイ

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<p>　The seasonal changes in aquatic vegetation areas of Ibanaiko Lagoon on the east coast of Lake Biwa were investigated using drone and satellite data. From February to December 2021, we continuously photograthed Ibanaiko Lagoon with a drone six times and created a composite,ortho-mosaic image. Based on the image, polygons were formed by QGIS to encircle the aquatic vegetation. The aquatic vegetation area and their coverage ratio on the water surface were estimated. Of the 63 hectares surveyed, the maximum area of aquatic vegetation was 36 hectares, and the ratio was 57 %. The series of vegetation area were also estimated using NDVI of satellite data. The areas estimated by both approaches were positively correlated (r = 0.988, p < 0.01). The aquatic vegetation area expanded from May–August and shrank from August–December. The maximum growth rate was observed in July. The detected aquatic plants were predominantly Trapa L. and water hyacinth Eichhornia crassipes. The most dominant genus was Trapa L. in August. Trapa L. began to decline prior to water hyacinth,shifting the dominant genus to water hyacinth in December.</p>

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