DIACHRONIC MONITORING OF SURFACE ENERGY FLUXES BY REMOTE DETECTION IN THE NORTHEN-EST OF NIGER W NATIONAL PARK

  Arouna   SALEY Hamidou, Oumar Diop, Amadou SEIDOU Maiga

Abstract


The general objective of the present work is to contribute to a set up of an operational prototype of monitoring surface energy fluxes inside the Niger’s W Park, using Landsat data and few fields’ data. The model SEBAL/METRIC is used to estimate the main surface fluxes. The diachronic study of the obtained fluxes reveals constant daily mean values for a given season. During autumn 2002, the mean values of the daily evapotranspiration are almost 4mm/day. Humidity indicators are then deduced from the obtained fluxes. Their diachronic study permits to identify area with cold pixels as been less stressed than area having dry pixels. This study shows that Landsat imagery can be used, at a large scale, in monitoring the main biophysical processes occurring at the Soil-Vegetation-Atmosphere interface. Then; it allows identifying areas at risk, inside the Park, needing an adequate plan of management and conservation.

Keywords


Energy Fluxes; Remote Detection; Soil-Vegetation-Atmosphere interface; Diachronic

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