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Developing a Prototype Web-Based Application for Non-Point Source Pollution Assessment in the Songtao Watershed, Hainan, China

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Developing a Prototype Web-Based Application for Non-Point Source Pollution Assessment in the Songtao Watershed, Hainan, China Developing a Prototype Web-based Application for Non-Point Source Pollution Assessment in the Songtao Watershed, Hainan, China by Yunwei Dong A thesis presented to the University of Waterloo in fulfillment of the thesis requirement for the degree of Master of Environmental Studies in Geography Waterloo, Ontario, Canada, 2009 ©Yunwei Dong 2009 Library and Archives Bibliothèque et Canada Archives Canada Published Heritage Direction du Branch Patrimoine de l’édition 395 Wellington Street 395, rue Wellington Ottawa ON K1A 0N4 Ottawa ON K1A 0N4 Canada Canada Your file Votre référence ISBN: 978-0-494-54775-5 Our file Notre référence ISBN: 978-0-494-54775-5 NOTICE: AVIS: The author has granted a non- L’auteur a accordé une licence non exclusive exclusive license allowing Library and permettant à la Bibliothèque et Archives Archives Canada to reproduce, Canada de reproduire, publier, archiver, publish, archive, preserve, conserve, sauvegarder, conserver, transmettre au public communicate to the public by par télécommunication ou par l’Internet, prêter, telecommunication or on the Internet, distribuer et vendre des thèses partout dans le loan, distribute and sell theses monde, à des fins commerciales ou autres, sur worldwide, for commercial or non- support microforme, papier, électronique et/ou commercial purposes, in microform, autres formats. paper, electronic and/or any other formats. The author retains copyright L’auteur conserve la propriété du droit d’auteur ownership and moral rights in this et des droits moraux qui protège cette thèse. Ni thesis. Neither the thesis nor la thèse ni des extraits substantiels de celle-ci substantial extracts from it may be ne doivent être imprimés ou autrement printed or otherwise reproduced reproduits sans son autorisation. without the author’s permission. In compliance with the Canadian Conformément à la loi canadienne sur la Privacy Act some supporting forms protection de la vie privée, quelques may have been removed from this formulaires secondaires ont été enlevés de thesis. cette thèse. While these forms may be included Bien que ces formulaires aient inclus dans in the document page count, their la pagination, il n’y aura aucun contenu removal does not represent any loss manquant. of content from the thesis. AUTHOR'S DECLARATION I hereby declare that I am the sole author of this thesis. This is a true copy of the thesis, including any required final revisions, as accepted by my examiners. I understand that my thesis may be made electronically available to the public. ii Abstract The Songtao reservoir, located in the center of Hainan province, is one of the ten biggest reservoirs in China. Since agriculture is the main industry in the watershed, non-point source (NPS) pollution is the primary pollutant source affecting water quality in the reservoir. A scientific approach is required to assess NPS pollution in the Songtao watershed in order to support planning and decision making process related to land use and water resource management. This study compared several commonly used NPS hydrological models in order to identify a suitable model for NPS pollution analysis in the Songtao reservoir. The Soil and Water Assessment Tool (SWAT) was selected as the model to be used in this research. In order to put the SWAT model to practical use, a prototype web-based application was developed to help officers in local government in China to use the SWAT model in their decision making process. In addition, spatial and non spatial data about the Songtao watershed area were collected for the SWAT model. Despite data limitations, ArcSWAT software was employed to develop relative scenarios to assess the NPS pollution in the reservoir. One land use scenario was developed to identify an environmentally sensitive basin in the Songtao watershed and the other was created to demonstrate the consequences of over-exploiting forest land in local area. The limitations of using SWAT model in Hainan province were discussed. Further research opportunities such as data collection and model calibration and validation were identified. In addition, possible improvements to the web-based application were presented. iii Acknowledgements Here I would like to express my thanks to all people who have helped, encouraged and assisted me during my master study. First of all, I would like to thank my supervisor Professor Peter Deadman and committee member Professor Douglas Dudycha for their guidance during my research and study at University of Waterloo. Their enthusiasm and inspiration had motivated me during the whole studying process. Starting from the thesis topic selection, throughout the methodology design and writing the thesis, they provided sound advice and lots of good ideas. I would never make it without them. Dr. David Wood and Professor Robert Feick deserve particular thanks as my thesis readers. Specially, I would like to express my sincere thanks to Dr. David Wood who introduced me into the geography program. Thank you for all government officers in Hainan province who participated in this research project. Without their fully incorporation and hard working, my field research could not be successful. Moreover, I would like to express my special thanks to Cuiping Zhang for her generous help in Hainan province to arrange and organize everything for me. Moreover, I would like to thank my lab-mates and friends especially Mingming Su who helped me in the thesis writing work. Finally, my deepest gratitude goes to my parents for their unflagging love and support throughout my life. Their understanding and encouragement helped me throughout the whole writing process. To them I dedicate this thesis. iv Table of Contents List of Figures .......................................................................................................................................... viii List of Tables .............................................................................................................................................. x Chapter 1 Introduction ................................................................................................................................ 1 1.1 Problem statement ............................................................................................................................. 1 1.2 Purpose of research ........................................................................................................................... 2 1.3 Study area .......................................................................................................................................... 3 1.4 Research questions ............................................................................................................................ 5 1.5 Thesis structure ................................................................................................................................. 5 Chapter 2 Literature review ........................................................................................................................ 7 2.1 Hydrological models and NPS pollution ........................................................................................... 7 2.1.1 Theory of NPS pollution research .............................................................................................. 7 2.1.2 Relationship between GIS and spatial analyzing model .......................................................... 10 2.1.3 Hydrological models and GIS .................................................................................................. 14 2.1.4 Hydrological and NPS pollution models .................................................................................. 15 2.1.5 SWAT model theory and applications ..................................................................................... 39 2.2 Decision Support System (DSS) ..................................................................................................... 45 2.2.1 Internet Technology .................................................................................................................. 47 2.2.2 Web-based decision support system ......................................................................................... 48 2.2.3 Structure of Internet GIS .......................................................................................................... 49 2.2.4 Technology behind Internet GIS .............................................................................................. 51 2.2.5 Hydrology web based DSS ....................................................................................................... 53 2.2.6 SWAT web-based hydrological tools ....................................................................................... 55 2.3 Gap in literature ............................................................................................................................... 56 2.4 Summary ......................................................................................................................................... 57 Chapter 3 Internet GIS Server .................................................................................................................. 58 3.1 Open source and commercial GIS server ........................................................................................ 58 3.1.1 Open source GIS server ............................................................................................................ 58 3.1.2 Commercial
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