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Author : Chia-Chun Ho
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (987 download)
Download or read book Protection Des Berges Contre L'érosion Avec Des Dispositifs Incorporant Des Géotextiles written by Chia-Chun Ho and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chia-Chun Ho
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (125 download)
Download or read book Protection Des Berges Contre L'érosion Avec Des Dispositifs Incorporant Des Géotextiles written by Chia-Chun Ho and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ln this project, the soil erosion behavior under three flow conditions was studied by tests using the equipment developed respectively. The test result reveals that ground water seepage in the uni-dÎrectional flow zone may cause the internai erosion, and part of the soil particles may be lost through the openings of the geotextile, and the rest may be clogged inside the fibers of the geotextile or accumulated behind the geotextile, forming a natural filter layer and thereby causing the decrease of seepage velocity. Bi-directional cyclic flow zone can be categorized into short term and long-term cyclic flow conditions. The result of large-scale tank test for short term cyclic flow conditions reveals that the soil În the upper layer is subject to the cyclic wave loadings which may trigger higher excess pore pressure and result in collapse, while the soil in the middle layer may be eroded by the tangential flow along the riverbank and accumulated downstream. The test results using bi-directional cyclic flow instrument show that under the long-term bi-directional cyclic flow action, if the cyclic flow period is considerably long, no erosion is expected. However, as long as the seepage velocity increases, it will cause boiling and triggering considerable loss of soil and settlement. Erosion behavior in the tangential flow zone was studied with the parallel erosion test instrument. A suitable geotextile covered on the surface of the revetment cannot only avoid the erosion but also form a natural filter layer underneath the geotextile which prevent the soil from continuous erosion. Once the natural filter layer is completely formed, the revetment will be stabilized.
Author : Karine Warlouzel
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (494 download)
Download or read book Caractérisation et comportement des géotextiles pour la lutte contre l'érosion pluviale des sols written by Karine Warlouzel and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LES GEOTEXTILES UTILISES DANS LA LUTTE CONTRE L'EROSION ONT POUR BUT D'AIDER A L'INSTALLATION D'UNE COUVERTURE VEGETALE TOUT EN PROTEGEANT LES SOLS. OR AUCUNE CARACTERISTIQUE SPECIFIQUE ET AUCUN CRITERE DE DIMENSIONNEMENT N'EST ACTUELLEMENT PROPOSE POUR SAVOIR SI LES GEOTEXTILES UTILISES SONT EFFICACES POUR LIMITER L'EROSION ET ASSURER UNE BONNE VEGETALISATION. C'EST CE QUE NOUS AVONS TENTE DE DETERMINER. D'UNE PART DES ESSAIS SPECIFIQUES ONT ETE DEVELOPPES POUR CARACTERISER LES GEOTEXTILES UTILISES EN PROTECTION CONTRE L'EROSION, EN PARTICULIER LA MESURE DE L'AMORTISSEMENT DE L'IMPACT DES GOUTTES ET DE LA POROSITE DE SURFACE. D'AUTRE PART DES ESSAIS DE COMPORTEMENT DU SYSTEME SOL - GEOTEXTILE SOUMIS A LA PLUIE ET AU RUISSELLEMENT ONT ETE REALISES AU LABORATOIRE SUR UN PLAN INCLINE AVEC UN SIMULATEUR DE PLUIE. L'INFLUENCE DES PARAMETRES STRUCTURAUX DES GEOTEXTILES 2D ET 3D, DES SOLLICITATIONS HYDRAULIQUES (INTENSITE DE LA PLUIE ET DU RUISSELLEMENT) ET DES CONDITIONS GEOMETRIQUE (PENTE) A ETE ETUDIEE. LA METHODE DES PLANS D'EXPERIENCE A ETE APPLIQUEE POUR METTRE EN EVIDENCE LES PARAMETRES PERTINENTS. DES MODELES DE MECANISME DE PROTECTION CONTRE L'EROSION SONT PROPOSES. DES PLANCHES EXPERIMENTALES SUR SITE ONT PERMIS DE VALIDER, EN CONDITIONS REELLES DE PLUVIOMETRIE, LES COMPORTEMENTS OBSERVES. LA COMPATIBILITE DE LA STRUCTURE AVEC LA CROISSANCE DE LA VEGETATION A AUSSI ETE EXAMINEE PAR DES ESSAIS EN POTS ET IN SITU. ILS ONT MONTRE LE ROLE DE LA DIMENSION DES OUVERTURES SUR LE DEVELOPPEMENT DE LA PARTIE AERIENNE AU DESSUS DU GEOTEXTILE.
Author : Linda Strande
Publisher : IWA Publishing
ISBN 13 : 1780404735
Total Pages : 428 pages
Book Rating : 4.7/5 (84 download)
Download or read book Faecal Sludge Management written by Linda Strande and published by IWA Publishing. This book was released on 2014-08-15 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.
Author : David M. Robbins
Publisher : IWA Publishing
ISBN 13 : 178040476X
Total Pages : 148 pages
Book Rating : 4.7/5 (84 download)
Download or read book How to Design Wastewater Systems for Local Conditions in Developing Countries written by David M. Robbins and published by IWA Publishing. This book was released on 2014-03-15 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a practical handbook providing a step-by-step approach to the techniques used for characterizing wastewater sources and investigating sites where collection, treatment and reuse/disposal technologies will be installed. It is intended to help enable local implementation of on-site and decentralized wastewater management system (DWMS)for wide scale use in development settings. How to Design Wastewater Systems for Local Conditions in Developing Countries helps local service providers and regulatory officials make informed decisions through the use of tools, checklists and case studies. It includes a link to a web based community of on-site and decentralized wastewater professionals, which contains related tools and case studies. This handbook serves as a reference for training classes, certification programs, and higher education programs in civil and sanitary engineering. There is an increasing interest on the part of local government officials and private sector service providers to implement wastewater treatment systems to solve sanitation problems. The model presented in this handbook promotes activities that first generate data related to source and site conditions that represent critical inputs, and then applies this information to the technology selection process. Matching the most appropriate technologies to the specific needs of the wastewater project is the key that leads to long term sustainability. How to Design Wastewater Systems for Local Conditions in Developing Countries is an invaluable resource for public sector decision makers and private sector service providers in developing countries. It is also a useful text for students at engineering colleges in developing countries interested in taking a class that teaches the methods of decentralized wastewater management system (DWMS) development.
Author : Elizabeth Tilley
Publisher :
ISBN 13 : 9783906484570
Total Pages : 176 pages
Book Rating : 4.4/5 (845 download)
Download or read book Compendium of Sanitation Systems and Technologies written by Elizabeth Tilley and published by . This book was released on 2014 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
