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A Simple Device to evaluate the Influence Parameters of the Water erosion of Bare Sandy-Clay Soils of the City of Douala

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engineering（科研） 2019年第12期11卷 819-827页

作者： timothée thierry odi enyegue Didier Fokwa eric Flavien Mbiakouo-Djomo ebenezer Njeugna Doctoral Unit of engineering Sciences Laboratory of Mechanical Engineering ENSET University of Douala Douala Cameroon Department of Civil engineering eNSeT Douala University Douala Cameroon Department of Mechanical engineering Douala University Douala Cameroon

We explore the parameters that influence the dynamics of water erosion. The method used is an experimental laboratory simulation, which consists of the quantitative evaluation of eroded masses as a function of slope, soil cohesion and rainfall intensity. A simulator was designed to have the ability to vary the slope of the terrain, as well as the rainfall intensity. The variation of the soil cohesion is obtained by compacting the soil under different pressures using a hydraulic press associated with the whole experimental device. The results obtained show that the device is a good tool to simulate in the laboratory the behavior of different soil under the action of rain;because these results are in agreement with existing models USLe, MUSLe and RUSLe [1] [2] [3] [4].

关键词： Water erosion Mini-Rain Simulator Cohesion of a Soil Simulation Slope

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effects of Soil Compaction in the Fight against Unpaved Roads Degradation Due to erosion Caused by Heavy Rain: Proposition of a Specific CBR evaluation Model

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engineering（科研） 2021年第3期13卷 95-104页

作者： timothée thierry odi enyegue eric Flavien Mbiakouo-Djomo Hugues Tsanga Fabien Kenmogne Blaise Ngwem Bayiha Gilbert Tchemou ebenezer Njeugna Didier Fokwa Laboratory of Mechanics Doctorate Unit of Engineering Sciences Doctorate School of Fundamental and Applied Sciences University of Douala Douala Cameroon Department of Rural engeineering FASA University of Dschang Dschang Cameroon Civil engineering Department Higher Technical Teacher’s Training College University oh Douala Douala Cameroon Mechanics engineering Department Higher Technical Teacher’s Training College University oh Douala Douala Cameroon

Unpailt roads are generally subject to erosion, when they need to be bitumen, civil engineers need to know the geotechnical capabilities of the soil layers to be used as support, among these capabilities, for example, soil characteristics to withstand erosion. CBR has often been used to classify these soils according to their compaction. In this article, we propose a correlation between CBR and eroded soil mass through a simulator. Indeed, in this article we show that using a simulator, soils can be classified according to their ability to withstand water erosion, whether internal or external. Indeed it is shown that the mass of eroded soil is related to the compaction capacity of the soil just as the CBR also has. We study the effects and influence of soil compaction on the ability of an unpaved road to resist erosion caused by falling raindrops. To do this, lateritic soil is submitted to different compaction pressures. The compacted soil is then submitted to CBR test and rain fall through a mini rain simulator. Correlations between eroded soil masse and compaction pressure as well as CBR are derived. The study shows that the compaction reduces the erodibility and increases the bearing capacity of soil. The formula obtained is significant because we have a new way of evaluating soils in the laboratory.

关键词： Compaction erosion Lateritic Soil Rain Drop Unpaved Roads

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Determination of a Mathematical Model of erosion Taking into Account the Intensity of Rainfall and Soil Slopes from the Global MNT Model

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engineering（科研） 2022年第7期14卷 274-284页

作者： eric Flavien Mbiakouo-Djomo timothée thierry odi-enyegue André Abanda Gilbert Tchemou Ulrich Florin Djiofack-Tiagho Denis Tcheukam-Toko Ngouffo Koukougnang Réné Didier Fokwa ebénézer Njeugna Department of Rural engineering FASA University of Dschang Dschang Cameroon Department of Civil engineering ENSPD University of Douala Douala Cameroon Department of Mechanical engineering College of Technology University of Buea Buea Cameroon Department of Civil engineering ENSET Douala Cameroon Laboratory of Mechanics and Modeling of Physical Systems University of Dschang Dschang Cameroon

Our study is being carried out in the Wouri estuary more precisely in the Nylon area, Douala. This area is influenced by abundant rainfall which promotes the phenomenon of rain erosion. This erosion contributes to the degradation of structures and soils. To better understand and predict this phenomenon of rainfall erosion, we set out to establish a mathematical model that takes into account precipitation and topography. To this end, the data collected in the field and in the laboratory made it possible. First, we graphically modeled the variation of the potential as a function of the intensity of rainfall and the slope of the ground. Next, we identified a mathematical model from cubic spline surface interpolation. Finally, we obtained the mathematical model which makes it possible to evaluate and predict the erosion potential. The results obtained allowed to have an erosion potential of 153.67 t/ha/year with field data and 153.94 t/ha/year with laboratory data. We compared the results obtained with those existing in the literature on the same study site. This comparison made it possible to validate the established mathematical model. This mathematical model is a decision support tool and can predict problems related to water, erosion and the environment.

关键词： erosion erosion Potential Mathematical Model Rainfall Intensity Soil Slope

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