Ragala, Rachid

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Ragala, Rachid
Main Affiliation
Email
info@sorbonne.ae
Scopus Author ID
56010758900
Status
No Longer Affiliated

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  • Publication
    Cartographie et suivi de la densité des arbres de l'arganeraie (sud-ouest du Maroc) à partir d'images de télédétection à haute résolution spatiale
    (2013)
    Ragala, Rachid 
    The study is focused on surveying and monitoring tree cover in the argan tree sparse forest of South-West Morocco. Remote sensing data are one IKONOS image from 2003 and one GeoEye image from 2011 (obtained through Google Earth); the latter image has been registered with the 1m resolution IKONOS image used as reference. An object-oriented classification approach has been used to identify tree crowns on both images. However the multi-temporal comparison of results of the two classifications appears not reliable. An alternative solution is proposed through the interactive analysis of the scattergram of 2 channels, one from IKONOS (panchromatic) and one of GeoEye image (sum of 3 bands). In the studied area, tree cover is very low (about 8%) and there are no drastic changes in tree density from 2003 to 2011, except in restricted disturbed areas.
      80
  • Publication
    The aqueducts of the sultanate of Oman: Sustainable water-supplying systems irrigating oases cities
    (Taylor & Francis, 2016)
    Ragala, Rachid 
    This book presents the major engineering achievements in underground aqueducts from around the world and throughout history. It provides valuable insights into water technologies and management with respect to durability, adaptability to the environment, and sustainability. Comparisons of the technological underground aqueduct developments from several regions are made. These technologies are the underpinning of modern achievements in water supply engineering and water management practices, and current issues of sustainability, cost-effectiveness, and decentralization have led engineers to consider combining older proven technologies with modern infrastructure advancements
      91  81
  • Publication
    The Role of Catastrophic Floods Generated by Collapse of Natural Dams Since the Neolithic in the Oases of Bukhara and Qaraqöl: Preliminary Results
    (2016)
    Fouache, Eric 
    ;
    Rante, Rocco
    ;
    Mirzaakhmedov, Djamal
    ;
    Ragala, Rachid 
    ;
    Dupays, Malvina
    ;
    Vella, Claude
    ;
    Fleury, Jules
    ;
    Andrieu-Ponnel, Valerie
    ;
    Zink, Antoine
    ;
    Porto, Elisa
    ;
    Brunet, Frédérique
    ;
    Cez, Lucie
    The history of the civilizations of the oases of Bukhara and Qaraqöl (south-eastern Uzbekistan) since the Neolithic in relation to environmental changes is studied by the French/Uzbekistan Archaeological Mission in Bukhara 1 following pioneering Russian studies 2 . Using a methodology tested in Afghanistan, the geoarchaeological side of the program focused on the drawing of a regional geomorphological map then on the identification, mapping and dating of the paleochannels of the river Zerafshan. We established the chronology of several generations of fluvial channels in relation to archaeological settlements of different eras (Early Neolithic, Neolithic, Bronze Age, Iron Age and Islamic period) and with optically stimulated luminescence dating of alluvial deposits. Based on preliminary results of these OSL dates we propose and discuss a regional environmental reconstruction. We hypothesize that the main cause of avulsion could be catastrophic floods generated by collapse of natural dams in the upper part of the Zerafshan River.
      89  82