Remote Sensing-Derived Bathymetry of Lake Poopó

Remote Sensing

Adalbert Arsen¹  Jean-François Crétaux¹  Muriel Berge-Nguyen¹ 

[1] Centre National d’Études Spatiales (CNES), Laboratoire d’Études en Géophysique et Océanographie Spatiales (LEGOS), 14 av Edouard Belin, F-31400 Toulouse, France; E-Mails:

关键词: Lake Poopo;    Bolivia;    remote sensing;    bathymetry;    hypsometry;    ICESat;    Landsat;   

DOI  :  10.3390/rs6010407

来源: mdpi

【 摘 要 】

Located within the Altiplano at 3,686 m above sea level, Lake Poopó is remarkably shallow and very sensitive to hydrologic recharge. Progressive drying has been observed in the entire Titicaca-Poopó-Desaguadero-Salar de Coipasa (TPDS) system during the last decade, causing dramatic changes to Lake Poopó’s surface and its regional water supplies. Our research aims to improve understanding of Lake Poopó water storage capacity. Thus, we propose a new method based on freely available remote sensing data to reproduce Lake Poopó bathymetry. Laser ranging altimeter ICESat (Ice, Cloud, and land Elevation Satellite) is used during the lake’s lowest stages to measure vertical heights with high precision over dry land. These heights are used to estimate elevations of water contours obtained with Landsat imagery. Contour points with assigned elevation are filtered and grouped in a points cloud. Mesh gridding and interpolation function are then applied to construct 3D bathymetry. Complementary analysis of Moderate Resolution Imaging Spectroradiometer (MODIS) surfaces from 2000 to 2012 combined with bathymetry gives water levels and storage evolution every 8 days.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland