[ Etude décennale (2005-2015) par imagerie satellitale de l’évolution spatiotemporelle des feux de brousse dans l’arrondissement de Koussanar (Région de Tambacounda) ]
Volume 24, Issue 4, November 2018, Pages 1645–1657
Amsatou THIAM1, Abdoulaye WELE2, Serigne Modou SARR3, and Cheickh Mame Mor MBODJI4
1 Institut Supérieur de Formation Agricole et Rurale (ISFAR), Université de Thiès, BP 54, Bambey, Senegal
2 Centre de Suivi Ecologique, Senegal
3 Institut Supérieur de Formation Agricole et Rurale (ISFAR), Université de Thiès, BP 54, Bambey, Senegal
4 Institut Supérieur de Formation Agricole et Rurale (ISFAR), Université de Thiès, BP 54, Bambey, Senegal
Original language: French
Copyright © 2018 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The objective of this study is to have a real knowledge by locality of dynamics and the propagation mode of the bush fires in time in space. To achieve our goal a methodological approach was adopted by a use on the one hand satellite images and software of SIG for the image processing and on the other hand cards of investigations for the talks, the GPS for the localization of the CVD (Village Committee of Development), of the mowings for the collection of herbaceous biomass and of the compasses for the determination of the transect. This work was supplemented by investigations into the ground and that made it possible to determine on average 10000 hectares which burn each season is to say October to May with reduction (controlled fire) for the period from October at November. The study highlighted on the one hand that late fires intervene in second half of the dry season to reach significant proportions in February and Mars and on the other hand that the occurrences of fire are observed in the South of the district where is the classified field.The estimate of the vegetable biomass is obtained starting from a correlation of the data to the level satelitte to extract the Index from Vegetation by the Standardized Difference (NDVI) of the channels red and near infra-red to the imagery of the year corresponding and the data of ground for the determination of the herbaceous and woody production to the level of the sites of control on the ground. Each more than 60% of the total production of the vegetable biomass disappears under the action of fires.
Author Keywords: bush fires, occurrence, satellite Koussanar, NDVI (Index from Vegetation by the Standardized Difference).
Volume 24, Issue 4, November 2018, Pages 1645–1657
Amsatou THIAM1, Abdoulaye WELE2, Serigne Modou SARR3, and Cheickh Mame Mor MBODJI4
1 Institut Supérieur de Formation Agricole et Rurale (ISFAR), Université de Thiès, BP 54, Bambey, Senegal
2 Centre de Suivi Ecologique, Senegal
3 Institut Supérieur de Formation Agricole et Rurale (ISFAR), Université de Thiès, BP 54, Bambey, Senegal
4 Institut Supérieur de Formation Agricole et Rurale (ISFAR), Université de Thiès, BP 54, Bambey, Senegal
Original language: French
Copyright © 2018 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The objective of this study is to have a real knowledge by locality of dynamics and the propagation mode of the bush fires in time in space. To achieve our goal a methodological approach was adopted by a use on the one hand satellite images and software of SIG for the image processing and on the other hand cards of investigations for the talks, the GPS for the localization of the CVD (Village Committee of Development), of the mowings for the collection of herbaceous biomass and of the compasses for the determination of the transect. This work was supplemented by investigations into the ground and that made it possible to determine on average 10000 hectares which burn each season is to say October to May with reduction (controlled fire) for the period from October at November. The study highlighted on the one hand that late fires intervene in second half of the dry season to reach significant proportions in February and Mars and on the other hand that the occurrences of fire are observed in the South of the district where is the classified field.The estimate of the vegetable biomass is obtained starting from a correlation of the data to the level satelitte to extract the Index from Vegetation by the Standardized Difference (NDVI) of the channels red and near infra-red to the imagery of the year corresponding and the data of ground for the determination of the herbaceous and woody production to the level of the sites of control on the ground. Each more than 60% of the total production of the vegetable biomass disappears under the action of fires.
Author Keywords: bush fires, occurrence, satellite Koussanar, NDVI (Index from Vegetation by the Standardized Difference).
Abstract: (french)
L’objectif de cette étude est d’avoir une connaissance réelle par localité de la dynamique et du mode propagation des feux de brousse dans le temps dans l’espace. Pour atteindre notre objectif une approche méthodologique a été adoptée par une utilisation d’une part des images satellitaires et des logiciels de SIG pour le traitement des images et d’autre part des fiches d’enquêtes pour les entretiens, le GPS pour la localisation des CVD, des fauches, pour la collecte de biomasse herbacée et des boussoles pour la détermination du transect. L’analyse de l’évolution des feux a été faite à partir des données statistiques obtenues à partir des images de MODIS (MCD45A1) pour déterminer les occurrences de feu de 2005 à 2015. L’étude a mis en évidence d’une part que les feux tardifs interviennent dans la deuxième moitié de la saison sèche pour atteindre des proportions importantes en Février et Mars et d’autre part que les occurrences de feu sont plus observées au Sud de l’arrondissement où se trouve le domaine classé. L’estimation de la biomasse végétale est obtenue à partir d’une corrélation des données au niveau satellitale pour extraire l'Indice de Végétation par la Différence Normalisée (NDVI) des canaux rouge et proche infrarouge de l'imagerie de l’année correspondante et des données de terrain pour la détermination de la production herbacée et ligneuse au niveau des sites de contrôle au sol. Chaque année plus de 60% de la production totale de la biomasse végétale disparait sous l’action des feux.
Author Keywords: feux de brousse, occurrence, satellite Koussanar, NDVI (Indice de Végétation par la Différence Normalisée).
How to Cite this Article
Amsatou THIAM, Abdoulaye WELE, Serigne Modou SARR, and Cheickh Mame Mor MBODJI, “Decennial study (2005-2015) by imagery satellitale of the spatiotemporelle evolution of the bush fires in the district of Koussanar (Area of Tambacounda),” International Journal of Innovation and Applied Studies, vol. 24, no. 4, pp. 1645–1657, November 2018.
