Achari, GopalWang, Chien-Kai Kenneth2017-12-182017-12-182012Wang, C. K. (2012). A gas generation, migration and extraction model for landfills (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/4779http://hdl.handle.net/1880/105780Bibliography: p. 103-113A page is in colour.Includes copy of copyright permission. Original copy with original Partial Copyright Licence.A numerical model is developed to simulate the generation, movement, extraction, and surface emission of landfill gas as well as possible air intrusion in a sanitary landfill equipped with an active or a passive gas collection system. The model was validated using results and data published in literature and has been used to study how the efficiency of a gas collection system may be impacted by a number of factors including vacuum pressure, well screen length, intermediate and final covers' thickness and permeability, number of gas collection wells and direction of well placement. The results suggest that a higher gas collection rate can be achieved by using a vertically placed well with a stronger vacuum pressure, a longer well screen, and a thicker and less permeable final cover, while undesirable air intrusion may be minimized by installing a larger number of wells.xv, 113 leaves : ill. ; 30 cm.engUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.master thesis10.11575/PRISM/4779