Technical Elements Research On Composition Of Urban Form In Southwest Mountain In China

Urban form, which appears in specific geographic environment and corresponding social economic process, is attributed to interactions between human activities and natural environment and has its own evolving laws. There are various factors that influence and restrict the emerging and developing of urban form, a crucial one of which is geographic environment. Rivers and water systems are important components of urban geographic environment. Because they impact city's water supply, drainage, shipping, ecology, tourism and culture, rivers, to a certain extent, direct urban form's shaping and growing; meanwhile, explicit space expansion and implicit mechanism transition of urban form work upon river environment as well. In China, the conflict between city and river environment is still severe, in addition to global climate changes, problems keep arising, such as flood, drought, water quality deterioration, water resources shortage and biodiversity damage, all of which have been threatening city's sustainable development. Nowadays, study on the relationship between urban and river environment, which lacks a systematic summary, usually just focuses on microcosmic level, for example, urban waterfront, or aesthetic level. City is a complex of highly complicated economy, politics and society. To think of how to break time and space limits, and to discuss long-time effect of river environment toward urban form and to integrate related technical measures, should be considered as breakthroughs in solving the dilemma of human-water.China is a mountainous country. Cities and towns located in mountain areas take up half of the total, and most of them are sited at Southwest China and are close to upper reaches of rivers, which are meaningful ecological strategic positions. Consequently how to direct sustainable development of mountainous cities form is especially significant and urgent, depending on mountain areas'characteristics and under the backgrounds of the Western Development and fast urbanization.Starting from the aspects of human settlements sciences, C.A. Doxiadis'Ekistics, edge effects theory, urban hydrology and so on, this thesis comprehensively analyzes rivers'mechanisms during the evolution of mountainous urban form, and comes to a conclusion that inland mountainous urban form's evolution complies with Falling Force Model. Combined with relating technical control strategies, it provides references to future development of southwest mountainous cities'space form. This study mainly contains the following six parts:1.Introduction: it introduces this thesis's writing background, writing purpose and significance, researching object, researching contents and structure, and researching methods etc.2.Based upon one primary model, urban water circulating system, part two gives a comprehensive explanation of the basic relationship between urbanization and river environment at mass-energy level, ground on the perspectives of urbanization, climate, precipitation, drainage and pollution control etc. It provides theoretical basis of urban form to later chapters.3.Depending on C.A. Doxiadis'Ekistics and edge effects theory, part three states a concept"fringe attraction". It consists of waterfront fringe attraction, traffic artery fringe attraction, positive ecology fringe attraction and negative ecology fringe attraction. At the same time, this part also points out that waterfront fringe attraction is the dominant of the four, which is mentioned by the writer as the term Falling Force Model.4.According to China's southwest mountainous terrain and history evolution, part four applies the method of empirical study to fields of"human's early accumulative form","urban form of static urban stage"and"urban form of dynamic urban stage". It also makes some expectations and prospects. It is summed up that, from macro to micro scales, China's southwest mountainous urban form has always been led by river environment, following the stages of appearing, establishing, growing and developing, which coincide with the conclusion of chapter three: river environment directs inland mountainous urban form's evolution.5.On the basis of analysis and studying fruits of former chapters, this part reaches a conclusion that the main technical factors involving in the contradiction of human-water in Southwest China comprise: time and space level (land use planning)– river falling force and urban ground surface structure; mass-energy level - water supply, displacement, greenhouse gas discharge amount, air pollution and shore field ecological sensitivity. Drawing on similar excellent cases both at home and abroad and following China's correlative technical specifications and policies, the writer proposes several constructional strategies on account of current problems. This study will be helpful in guiding the sustainable development of urban form and river environment in Southwest China. 6.Conclusion: this part summarizes the study results and indicates possible research orientations in the future.