[ Une méthode de détection de changements amont et aval pour le suivi des superficies agricoles irriguées de la région de la Haute-Comoé, au Burkina Faso ]
Volume 41, Issue 4, February 2024, Pages 957–971
Farid Traoré1, Sié Palé2, Aïda Zaré3, Bonkoungou Joachim4, Jérôme Compaoré5, Kibissi Paré6, Rodrigue Walbeogo7, and BVC Adolphe Zangré8
1 Institut de l’Environnement et de Recherches Agricoles (INERA), 04 BP 8645 Ouagadougou 04, Burkina Faso
2 Université de Dédougou, Institut des Sciences de l’Environnement et du Développement Rural, BP 176 Dédougou, Burkina Faso
3 Université de Dédougou, Institut des Sciences de l’Environnement et du Développement Rural, BP 176 Dédougou, Burkina Faso
4 Institut de l'Environnement et de Recherches Agricoles, INERA Ouagadougou, Burkina Faso
5 Chercheur INERA/CNRST 04 BP 8645 Ouagadougou 04, Burkina Faso
6 DGADI, 03 BP 7123, Ouagadougou 03, Burkina Faso
7 SERAT, 01 BP 1466, Ouagadougou C.N.T 01, Burkina Faso
8 DGADI, 03 BP 7123, Ouagadougou 03, Burkina Faso
Original language: French
Copyright © 2024 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 Haute-Comoé watershed in southwest Burkina Faso is characterized by water resources used for irrigated agriculture, among other things. The water resources of the Haute-Comoé watershed consist mainly of the waters of the Comoé River and its tributaries. Over time, pressure on the basin’s water resources has increased due to the expansion of irrigated agricultural areas. With a view to preventing conflicts over the use of water resources, this study was carried out to examine the evolution, over nearly 40 years, of irrigated agricultural areas within market gardening areas. Market gardening is one of the fastest-growing components of irrigated agriculture, particularly since the promotion of small-scale private irrigation launched by the Burkina Faso government in the early 2000s. To achieve the study’s objective, a method based on the processing of a series of satellite images was adopted. The method used consists in classifying a series of images acquired on anniversary dates, but consecutively 7 to 15 years apart (1986, 2001, 2015 and 2023). On the basis of agronomic expertise, a post-classification phase, based on an analysis of the temporal trajectory of classified pixels, was carried out in order to correct certain unlikely pixel trajectories. Results were evaluated by measuring overall accuracy and the Kappa coefficient. Overall accuracies ranged from 72.57% to 81.90% (for the classification phase) and from 88.25% to 92.50% (for the post-classification phase). At the end of the image post-classification phase, a change detection analysis, i.e. a measurement of the intensity of change (spatial variations) within the classes considered, was carried out, making it possible to assess changes in terrain over time, and to identify categories and levels of transition between classes. The study showed that irrigated areas increased by 25% between 1986 and 2023 in the study area.
Author Keywords: Irrigation, land use/occupancy, change detection analysis, intensity analysis, Landsat, water management.
Volume 41, Issue 4, February 2024, Pages 957–971
Farid Traoré1, Sié Palé2, Aïda Zaré3, Bonkoungou Joachim4, Jérôme Compaoré5, Kibissi Paré6, Rodrigue Walbeogo7, and BVC Adolphe Zangré8
1 Institut de l’Environnement et de Recherches Agricoles (INERA), 04 BP 8645 Ouagadougou 04, Burkina Faso
2 Université de Dédougou, Institut des Sciences de l’Environnement et du Développement Rural, BP 176 Dédougou, Burkina Faso
3 Université de Dédougou, Institut des Sciences de l’Environnement et du Développement Rural, BP 176 Dédougou, Burkina Faso
4 Institut de l'Environnement et de Recherches Agricoles, INERA Ouagadougou, Burkina Faso
5 Chercheur INERA/CNRST 04 BP 8645 Ouagadougou 04, Burkina Faso
6 DGADI, 03 BP 7123, Ouagadougou 03, Burkina Faso
7 SERAT, 01 BP 1466, Ouagadougou C.N.T 01, Burkina Faso
8 DGADI, 03 BP 7123, Ouagadougou 03, Burkina Faso
Original language: French
Copyright © 2024 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 Haute-Comoé watershed in southwest Burkina Faso is characterized by water resources used for irrigated agriculture, among other things. The water resources of the Haute-Comoé watershed consist mainly of the waters of the Comoé River and its tributaries. Over time, pressure on the basin’s water resources has increased due to the expansion of irrigated agricultural areas. With a view to preventing conflicts over the use of water resources, this study was carried out to examine the evolution, over nearly 40 years, of irrigated agricultural areas within market gardening areas. Market gardening is one of the fastest-growing components of irrigated agriculture, particularly since the promotion of small-scale private irrigation launched by the Burkina Faso government in the early 2000s. To achieve the study’s objective, a method based on the processing of a series of satellite images was adopted. The method used consists in classifying a series of images acquired on anniversary dates, but consecutively 7 to 15 years apart (1986, 2001, 2015 and 2023). On the basis of agronomic expertise, a post-classification phase, based on an analysis of the temporal trajectory of classified pixels, was carried out in order to correct certain unlikely pixel trajectories. Results were evaluated by measuring overall accuracy and the Kappa coefficient. Overall accuracies ranged from 72.57% to 81.90% (for the classification phase) and from 88.25% to 92.50% (for the post-classification phase). At the end of the image post-classification phase, a change detection analysis, i.e. a measurement of the intensity of change (spatial variations) within the classes considered, was carried out, making it possible to assess changes in terrain over time, and to identify categories and levels of transition between classes. The study showed that irrigated areas increased by 25% between 1986 and 2023 in the study area.
Author Keywords: Irrigation, land use/occupancy, change detection analysis, intensity analysis, Landsat, water management.
Abstract: (french)
Le bassin versant de la Haute-Comoé situé dans le sud-ouest du Burkina Faso, est caractérisé par des ressources en eau utilisées entre autres pour l’agriculture irriguée. Les ressources en eau de ce bassin de la Haute-Comoé se composent essentiellement des eaux de la rivière Comoé et ses affluents. Au fil du temps, la pression sur les ressources en eau du bassin s’est accrue du fait de l’expansion des superficies agricoles irriguées. Dans une perspective de prévention des conflits autour de l’utilisation de la ressource eau, cette étude a été menée afin d’examiner l’évolution, sur près de 40 ans, des superficies agricoles irriguées au sein des zones de production maraîchère. La production maraîchère est l’une des composantes de l’agriculture irriguée qui a connu la plus grande croissance, notamment depuis la promotion de la petite irrigation privée, lancée par le gouvernement du Burkina Faso au début des années 2000. Pour atteindre l’objectif de l’étude, une méthode basée sur le traitement d’une série d’images satellites a été adoptée. La méthode utilisée consiste en une classification de série d’images acquises à des dates anniversaires, mais consécutivement éloignées l’une de l’autre de 7 à 15 ans (1986, 2001, 2015 et 2023). Sur la base d’une expertise agronomique, une phase de post-classification s’appuyant sur une analyse de la trajectoire temporelle des pixels classifiés, a été effectuée afin de corriger certaines trajectoires improbables de pixels. L’évaluation des résultats s’est faite, entre autres, par la mesure de la précision globale et du coefficient Kappa. Les précisions globales sont comprises entre 72,57 % et 81,90 % (pour la phase de classification) et entre 88,25 % et 92,50 % (pour la phase de post-classification). À l’issue de la post-classification des images, une analyse de détection de changements, c’est-à-dire une mesure de l’intensité des changements (variations spatiales) au sein des classes considérées a été réalisée, permettant d’évaluer les changements de terrain au fil du temps, et d’identifier les catégories et niveaux de transition entre les classes. L’étude a montré que les superficies agricoles irriguées ont augmenté de 25 % entre 1986 et 2023 dans la zone d’étude.
Author Keywords: Irrigation, utilisation/occupation des terres, analyse de détection de changement, analyse d’intensité, Landsat, Gestion de l’eau.
How to Cite this Article
Farid Traoré, Sié Palé, Aïda Zaré, Bonkoungou Joachim, Jérôme Compaoré, Kibissi Paré, Rodrigue Walbeogo, and BVC Adolphe Zangré, “A backward and forward change detection method for monitoring irrigated areas in the Haute-Comoé region, Burkina Faso,” International Journal of Innovation and Applied Studies, vol. 41, no. 4, pp. 957–971, February 2024.
