Stage Monitoring in Turbid Reservoirs with an Inclined Terrestrial Near-Infrared Lidar

Remote Sensing

Vicente Guerrero-Meza¹  Younès Rifad²  Serge Tamari³  José Javier Sánchez-Chávez³  Luis Bravo-Inclán³ 

[1] DISIME S.A. de C.V., Playa Villa del Mar No. 180, Col. Militar Marte, Ciudad de México D.F. 08830, Mexico;Ecole des Mines de Douai (EMD), 941 rue Charles Bourseul, Douai 59508, France;Instituto Mexicano de Tecnología del Agua (IMTA), Paseo Cuauhnáhuac No. 8532, Col. Progreso, Jiutepec Mor. 62550, Mexico;

关键词: hydrometry;    water level;    emerging technique;    terrestrial Lidar;    laser rangefinder;    light backscattering;    Tyndall effect;   

DOI  :  10.3390/rs8120999

来源: DOAJ

【 摘 要 】

To monitor the stage in turbid reservoirs with a sloping bank, it has been proposed to install a near-infrared Lidar on the bank and to orient it so that it points at the water surface with a large incidence angle (between ≈ 30° and 70°). The technique assumes that the Lidar can detect suspended particles that are slightly below the water surface. Some laboratory results and the first long-term assessment (>2 years) of the technique are presented. It found that: (1) although the test Lidar provides erratic distance data, they can be easily filtered according to the intensity of the received signal; (2) the Lidar provides reliable data only when the water is very turbid (Secchi depth smaller than ≈ 1.0 m); and (3) the reliable data can be used to estimate daily stage values (after a simple field calibration) with an uncertainty better than ±0.08 m (p = 0.95). Although the present form of the technique is not very accurate, it uses an inexpensive instrument (≈1500 USD) which can be easily installed in a safe place (such as is the roof of a building). It is argued that the technique could be also used to monitor the stage and the sub-surface velocity in others turbid water bodies, such as some coastal areas (a recent field of application) and flooding rivers.

【 授权许可】

Unknown