Ovando A., Martinez Jean-Michel, Tomasella J., Rodriguez D. A., von Randow C. (2018). Multi-temporal flood mapping and satellite altimetry used to evaluate the flood dynamics of the Bolivian Amazon wetlands. International Journal of Applied Earth Observation and Geoinformation, 69, p. 27-40. ISSN 0303-2434.
Titre du document
Multi-temporal flood mapping and satellite altimetry used to evaluate the flood dynamics of the Bolivian Amazon wetlands
Ovando A., Martinez Jean-Michel, Tomasella J., Rodriguez D. A., von Randow C.
Source
International Journal of Applied Earth Observation and Geoinformation, 2018,
69, p. 27-40 ISSN 0303-2434
The Bolivian Amazon wetlands are extensive floodplains distributed over the Mamore, Beni, Madre de Dios and Guapore Rivers. Located within the upper Madeira River Basin, the wetlands play important roles in regulating the biogeochemical processes and hydrological cycle of the region. In addition, they have major ecological and hydrological relevance for the entire Amazon Basin. These wetlands are characterized by the occurrence of episodic floods that result from contrasting hydro-meteorological processes in the Andean Mountain region, the piedmont area and the Amazon lowlands. In this study, we characterized the flood dynamics of the region using multi-temporal flood mapping based on optical altimetry (MODIS - Moderate Resolution Imaging Spectroradiometer - M*D09A1) and satellite altimetry (ENVISAT RA-2 and SARAL AltiKa altimeters). This study provides new insights regarding the frequency, magnitude and spatial distribution of exogenous floods, which are created by flood waves from the Andes; and endogenous floods, which result from runoff originating in the lowlands. The maximum extent of flooding during 2001-2014 was 43144 km(2) in the Mamore Basin and 34852 km(2) in the Guapore Basin, and the total surface water storage in these floodplains reached 94 km3. The regionalization of flood regimes based on water stage time series signatures allowed those regions that are exposed to frequent floods, which are generally located along rivers without a direct connection with the Andes, to be distinguished from floodplains that are more dependent on flood waves originating in the Andes and its piedmonts. This information is of great importance for understanding the roles of these wetlands in the provision of ecosystem services.
Plan de classement
Hydrologie [062]
;
Etudes, transformation, conservation du milieu naturel [082]
;
Télédétection [126]
