Dynamics of Built-Up Areas and Loss of Vegetation in Secondary Towns: Case Study of Sarh Town in Chad, Central Africa

François Teadoum Naringué (), N’Dilbé Tob-Ro, Melone Like Sorsy, Julien Komivi Sodjinè Aboudou, Asrom Blondel Mgang-yo, Bourdannet Patouki Sing-Non, Altolnan Parfait Tombar and Follygan Hetcheli
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François Teadoum Naringué: Regional Center of Excellence on Sustainable Cities in Africa (CERViDA-DOUNEDON), University of Lome, Lome 01 BP 1515, Togo
N’Dilbé Tob-Ro: Geography Department, Adam Barka University of Abeche, N’Djamena BP 5539, Chad
Melone Like Sorsy: Research Laboratory on Spaces, Exchanges and Human Security, University of Lome, Lome 01 BP 1515, Togo
Julien Komivi Sodjinè Aboudou: Applied Remote Sensing and Geoinformatics Laboratory (LTAG), University of Lome, Lome 01 BP 1515, Togo
Asrom Blondel Mgang-yo: Regional Center of Excellence on Sustainable Cities in Africa (CERViDA-DOUNEDON), University of Lome, Lome 01 BP 1515, Togo
Bourdannet Patouki Sing-Non: Regional Center of Excellence on Sustainable Cities in Africa (CERViDA-DOUNEDON), University of Lome, Lome 01 BP 1515, Togo
Altolnan Parfait Tombar: Regional Center of Excellence on Sustainable Cities in Africa (CERViDA-DOUNEDON), University of Lome, Lome 01 BP 1515, Togo
Follygan Hetcheli: Research Laboratory on Spaces, Exchanges and Human Security, University of Lome, Lome 01 BP 1515, Togo

Sustainability, 2025, vol. 17, issue 3, 1-23

Abstract: The dynamics of the urbanisation of Sarh town in Chad, although less rapid than that of the capital city, has led to a significant loss of vegetation and unsustainable land use. This research aims to analyse the dynamics of land use, focusing on the expansion of built-up areas and the loss of vegetation. The methodology used includes the analysis of Landsat images from 1994, 2003, 2013, and 2022, supplemented by field data, statistical analysis, interviews, and documentary analysis. The results show that the built-up area, estimated at 806 hectares in 1994, reached 2603 hectares in 2022, representing an annual increase of 4.1%. Moreover, the area of vegetation decreased from 759 hectares to 231 hectares, a reduction of 69%. In addition, there is a strong negative correlation (r = −0.93) between the expansion of built-up areas and the loss of vegetation. On average, the annual growth of built-up areas (4.1%) exceeds that of the population (3.33%). Field surveys reveal that this situation is due to a preference for more spacious housing, inadequate land management, and the limited resources for vegetation rehabilitation. This research highlights the critical need for effective urban planning and management strategies to address the challenges posed by rapid urbanisation in secondary towns like Sarh.

Keywords: built-up areas; vegetation; urban sprawl; secondary towns; urbanisation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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