Abstract
Remote sensing techniques have been widely used to measure the qualitative parameters of waterbodies. Total suspended solid (TSS) is an important water quality parameter and a surrogate for the water clarity. It can be used as the indicator of sediment in the reservoir, which usually consists of silt, fine sand and microorganisms. This study aimed to utilize the remote sensing technology, in particular Landsat 8 Operational Land Imager (Landsat 8 OLI), to determine the amount of TSS concentration as well as the spatial distribution of TSS concentration in the surface water of the Tri An reservoir. The relationship between field TSS data collected in March, 2020 and the reflectance values of the the Landsat 8 Oli images was investigated. Results showed that there was a strong linear relationshiop between TSS concentration and the reflectance of the red and near infrared reflectance bands from the Landsat 8 Oli (r ranged from 0.58–0.93), in which the ratio of the red band produced the best correlation with the TSS (r = 0.93, with a standard error of 0.6–1.39 mg/L). Based on the linear regression equation, the TSS concentration calculated from the red reflectance values was used for mapping the spatial distribution of TSS in the surface water of the Tri An reservoir. Our results confirmed the accuracy and potential of using the single band from Landsat 8 OLI for mapping the spatial distribution of TSS in the Tri An reservoir.
Highlights
Remote sensing techniques have been widely used to measure the qualitative parameters of waterbodies
It can be used as the indicator of sediment
which usually consists of silt
Summary
Sử dụng ảnh Landsat 8 Oli để dự đoán tổng chất rắn lơ lửng (TSS) ở hồ Trị An, tỉnh Đồng Nai. Nghiên cứu này trình bày kết quả dự đoán tổng chất rắn lơ lửng (TSS) trong nước mặt ở hồ Trị An thông qua sử dụng ảnh vệ tinh Landsat 8 Opertional Land Imager (Landsat 8 OLI). Dựa vào mối quan hệ tuyến tính này, hàm lượng TSS trong nước hồ Trị An có thể tính toán từ phổ phản xạ của kênh 4-red từ ảnh Landsat 8 OLI. Kết quả tính toán hàm lượng TSS từ ảnh Landsat 8 OLI được sử dụng để xây dựng bản đồ hiện trạng phân bố TSS trong nước ở hồ Trị An. Nghiên cứu này cho thấy tính khả thi khi sử dụng ảnh vệ tinh Landsat 8 OLI trong giám sát các thông số chất lượng môi trường nước hồ Trị An, đặc biệt là TSS. Từ khoá: viễn thám, chất rắn lơ lửng, hồ Trị An, Landsat 8 OLI
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