Os impactes das mudanças globais nos recursos florestais na aŕea de montanha do Rif Central em Marrocos: da exploração extensiva às perspetivas de planeamento Referência: xxx (2019). The global change impacts on forest natural resources in Central Rif Mountains in northern Morocco: extensive exploration and planning perspective. Revista de Geografia e Ordenamento do Território (GOT), n.º 17 (junho). Centro de Estudos de Geografia e Ordenamento do Território, p. 75-92, dx.
This study aimed to assess landslide susceptibility in the Sahla watershed in northern Morocco. Landslides hazard is the most frequent phenomenon in this part of the state due to its mountainous precarious environment. The abundance of rainfall makes this area suffer mass movements led to a notable adverse impact on the nearby settlements and infrastructures. There were 93 identified landslide scars. Landslide inventories were collected from Google Earth image interpretations. They were prepared out of landslide events in the past, and future landslide occurrence was predicted by correlating landslide predisposing factors. In this paper, landslide inventories are divided into two groups, one for landslide training and the other for validation. The Landslide Susceptibility Map (LSM) is prepared by Logistic Regression (LR) Statistical Method. Lithology, stream density, land use, slope curvature, elevation, topographic wetness index, slope aspect, and slope angle were used as conditioning factors. The Area Under the Curve (AUC) of the Receiver Operating Characteristic (ROC) was employed to examine the performance of the model. In the analysis, the LR model results in 96% accuracy in the AUC. The LSM consists of the predicted landslide area. Hence it can be used to reduce the potential hazard linked with the landslides in the Sahla watershed area in Rif Mountains in northern Morocco.
In the Rif region in northern Morocco, the degradation of the environment exposes the soil to aggressive erosion agents, especially in the Mediterranean climate in which the evacuation of 2000 tons of soil per km2 per year is a basic average. In these difficult environments is necessary to manage the resource effectively by anticipation the situations of dry and wet years. Several development programs have been carried out in the Rif zone since 1960s and the problem persists, especially with the arrival of the new agriculture of Cannabis (Drug) in 1995 in the southern part of the study area which is characterized by its precarious environmental balance. This paper aims to examine the aspects of soil degradation and analyse the failure factors of the management programs and projects have been conducted by several national and international stakeholders including EU and UN.
The development programs have been carried out to deal with the degradation
phenomena since 1960 in Rif Mountains in northern Morocco. These conservation and
preservation projects of natural resources implemented using either mechanical or
biological techniques. The objective of this text is to evaluate the strategy undertaken
for water and soil conservation to curb poor land-use practices and to assess the
investment in water and soil conservation actions adopted the administrative approach
that does not involve the locals by encouraging their effective participation in the
identification, formulation, programming, execution, and monitoring of the actions to be
carried out.
This paper aims to identify potential areas of landslides in the Amzaz watershed in northern Morocco with its precarious environmental balance using the Information Value (IV) Model. Van Westen (1994) defines bivariate methods as a modified form of the quantitative map combination with the exception that weightings are assigned based upon the statistical relationship between past landslides and various factor maps, individual factor maps (independent variable). A set of factor maps were overlaid with a landslide map (dependent variable) to create cross-tabulations for each one and class. The landslide inventory is used to result in the susceptibility maps for better mitigation of the risks and losses related to this phenomenon. The results demonstrated that the percentage of rotational landslides varies between 8.79 and 30.08%, and between 9.79 and 23.36% for translational slides susceptibility in the Amzaz watershed.
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