Dynamique Des Risques D’érosion Ravinante Des Terres Marginales De La Commune Rurale D’idiofa (KWILU/R.D. Congo)

The erosion of marginal lands in the Idiofa Rural Commune is a major problem for urban authorities and the local population. This Commune has no integrated stormwater management plan, which has a detrimental impact on its site and its overall socio-economic and cultural development. The main objective of this study is to: (i) Identify the various gullies and their morphometric characteristics, (ii) Map the marginal areas in Idiofa, (iii) Identify the causes of the accelerated gully erosion observed in Idiofa, (iv) Assess the resulting socio-environmental consequences, (v) Understand, discuss and assess the risks, and (vi) Propose strategies to respond to these risks. The method used consisted of two stages: (i) a survey carried out among a sample of 200 people to obtain a population view of the degradation of its environment, (ii) field observations on the inventory of gullies and their dimensions, to complement and validate the data from radar interpretation. EpiData 3.0, Microsoft Excel 2016 and SPSS 22 were used to process the data collected. Thematic maps of the studied phenomenon were designed using ArcMap 10.8, QGIS Desktop 3.36 and Google Earth Pro. According to the results obtained, all the 133 identified ravines left a void volume of approximately 2,530,246 m3. This represents a loss of land of more than 2,000,000 tonnes, with considerable collateral damage.