Development of mathematical models for predicting the iron concentrations of Lake Oubeira waters (ne Algerian)

Facing the increase of surface water samples contaminated by ETMs, usually from the geochemical background, the emergence of new human diseases is worrying. To solve this problem, we have developed several models based on different learning algorithms qualified by high performance, using different transfer functions. We have shown that all the Neural Models presented more or less important performance  compared to the one based on multiple linear regressions. The best revealed model ANN in the current work is a MLP type that uses the Levenberg-Marquardt algorithm as a learning algorithm, with Tansig and Purelin as transfer functions, respectively in the hidden layer and the output layer. This successful model can be considered as an important tool of great effectiveness in the context of environmental prediction and especially in anticipation of the iron contents of the Oubeira Lake water.Keywords: Prediction, heavy metals, Linear multiple regression, artificial neural  networks, Oubéira Lake

Development of a Neural Network approach for Predicting nitrate and sulfate concentration in three lakes: Ifrah, Iffer and Afourgagh, Middle Atlas Morocco

Neural networks are mathematical and computer models to power nonlinear data that play a very important role in various scientific fields. They are specially used for automatic resolution of environmental problems.This study focuses on the prediction of nitrate (NO3-) and sulfate (SO42-) of lake water in the Moroccan Middle Atlas. Ifrah, Iffer and Afourgagh are taken as case studies by using a number of parameters physic-chemical of water. Two methods were used: Multiple Linear Regression (MLR) and Artificial Neural Networks (ANN) Multilayer Perceptron Model (MLP).In order to choose the best neural network architecture, several statistical tests were used in conjunction with some robustness tests: Mean Square Error (MSE), mean absolute error (MAE) and correlation coefficient (R).The results showed that the models established by artificial neural network Multilayer Perceptron type (ANN-MLP) of configuration [17-8-2] are more efficient compared to those determined by the conventional method based on multiple linear regression.This performance demonstrates the existence of a nonlinear relationship between the physic-chemical characteristics of both nitrates and sulfates in the lakes waters studied that are under investigation

Etude lithologique et pétrographique du cordon littoral post-ouljien de Témara (Maroc)

International audienc

Etude lithologique et pétrographique du cordon littoral post-ouljien de Témara (Maroc)

International audienc

Water Erosion Monitoring and Prediction in Response to the Effects of Climate Change Using RUSLE and SWAT Equations: Case of R’Dom Watershed in Morocco

Soil erosion is an increasingly issue worldwide, due to several factors including climate variations and humans’ activities, especially in Mediterranean ecosystems. Therefore, the aim of this paper is: (i) to quantify and to predict soil erosion rate for the baseline period (2000–2013) and a future period (2014–2027), using the Revised Universal Soil Loss Equation (RUSLE) and the Soil and Water Assessment Tool (SWAT) model in the R’Dom watershed in Morocco, based on the opportunities of Remote Sensing (RS) techniques and Geographical Information System (GIS) geospatial tools. (ii) we based on classical statistical downscaling model (SDSM) for rainfall prediction. Due to the lack of field data, the model results are validated by expert knowledge. As a result of this study, it is found that both agricultural lands and bare lands are most affected by soil erosion. Moreover, it is showed that soil erosion in the watershed was dominated by very low and low erosion. Although the area of very low erosion and low erosion continued to decrease. Hence, we hereby envisage that our contribution will provide a more complete understanding of the soil degradation in this study area and the results of this research could be a crucial reference in soil erosion studies and also may serve as a valuable guidance for watershed management strategies

Cartography of coastal aquifers in the Essaouira region by application of the geo-electric method (Essaouira, Morocco) Ouzerbane

International audienceThe region of ace that is given a heavy responsibility in the socio-economic developmentof Morocco. This development implies a significant increase in water needs in the coming years84for both drinking water supply and for irrigation and industry. This sector, like the other regionsof Morocco, has experienced a significant decrease in water intake in quantity and quality. Thissituation has led to the reduction of agricultural productivity and the degradation of severalecosystems. However, this basin has an aquifer system consisting of a set of uneven aquifersthat can offer a natural regulating capacity that makes them valuable to ensure a safe and steadysupply. The reserve also makes it possible to meet seasonal needs through temporary overexploitationto the extent that replenishment is possible.The so-called synclinal study area of Essaouira is part of the coastal zone of the basin withan area of approximately 1418 km2. It is limited to the North by Jbeb Hadid, to the South byTidzi River, to the East by the reliefs of South Chiadma, reliefs of North Haha and by the Tidzislide, and to the West by the Atlantic Ocean.Geo-electrical prospecting by vertical electrical soundings is a geophysical method that,applied in hydrogeology, will provide information on the geometry of possible reservoirs, theirlithological nature and the spatial evolution of these characteristics. The interpretation of theresults of this study, in correlation with the mechanical drilling, made it possible to stand outfrom the quantitative and qualitative maps, the different variations of apparent resistivity of thegeological layers constituting the aquifer and aquiclude. The analysis of these maps shows thatthe area around the Qsob River is of interest from a hydrogeological point of view

Cartography of coastal aquifers in the Essaouira region by application of the geo-electric method (Essaouira, Morocco) Ouzerbane

International audienceThe region of ace that is given a heavy responsibility in the socio-economic developmentof Morocco. This development implies a significant increase in water needs in the coming years84for both drinking water supply and for irrigation and industry. This sector, like the other regionsof Morocco, has experienced a significant decrease in water intake in quantity and quality. Thissituation has led to the reduction of agricultural productivity and the degradation of severalecosystems. However, this basin has an aquifer system consisting of a set of uneven aquifersthat can offer a natural regulating capacity that makes them valuable to ensure a safe and steadysupply. The reserve also makes it possible to meet seasonal needs through temporary overexploitationto the extent that replenishment is possible.The so-called synclinal study area of Essaouira is part of the coastal zone of the basin withan area of approximately 1418 km2. It is limited to the North by Jbeb Hadid, to the South byTidzi River, to the East by the reliefs of South Chiadma, reliefs of North Haha and by the Tidzislide, and to the West by the Atlantic Ocean.Geo-electrical prospecting by vertical electrical soundings is a geophysical method that,applied in hydrogeology, will provide information on the geometry of possible reservoirs, theirlithological nature and the spatial evolution of these characteristics. The interpretation of theresults of this study, in correlation with the mechanical drilling, made it possible to stand outfrom the quantitative and qualitative maps, the different variations of apparent resistivity of thegeological layers constituting the aquifer and aquiclude. The analysis of these maps shows thatthe area around the Qsob River is of interest from a hydrogeological point of view

Cartography of coastal aquifers in the Essaouira region by application of the geo-electric method (Essaouira, Morocco) Ouzerbane

International audienceThe region of ace that is given a heavy responsibility in the socio-economic developmentof Morocco. This development implies a significant increase in water needs in the coming years84for both drinking water supply and for irrigation and industry. This sector, like the other regionsof Morocco, has experienced a significant decrease in water intake in quantity and quality. Thissituation has led to the reduction of agricultural productivity and the degradation of severalecosystems. However, this basin has an aquifer system consisting of a set of uneven aquifersthat can offer a natural regulating capacity that makes them valuable to ensure a safe and steadysupply. The reserve also makes it possible to meet seasonal needs through temporary overexploitationto the extent that replenishment is possible.The so-called synclinal study area of Essaouira is part of the coastal zone of the basin withan area of approximately 1418 km2. It is limited to the North by Jbeb Hadid, to the South byTidzi River, to the East by the reliefs of South Chiadma, reliefs of North Haha and by the Tidzislide, and to the West by the Atlantic Ocean.Geo-electrical prospecting by vertical electrical soundings is a geophysical method that,applied in hydrogeology, will provide information on the geometry of possible reservoirs, theirlithological nature and the spatial evolution of these characteristics. The interpretation of theresults of this study, in correlation with the mechanical drilling, made it possible to stand outfrom the quantitative and qualitative maps, the different variations of apparent resistivity of thegeological layers constituting the aquifer and aquiclude. The analysis of these maps shows thatthe area around the Qsob River is of interest from a hydrogeological point of view