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Evaluation based digital watershed the left river basin ecological environment

Author: TangChuanYong
Tutor: LuYuan
School: Guangxi Normal University
Course: Cartography and Geographic Information Systems
Keywords: Eco‐environmentalqualityassessment DigitalRiver GIS RS AHP LeftRiverBasin
CLC: X826
Type: Master's thesis
Year: 2010
Downloads: 108
Quote: 0
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Abstract


Left River Basin is located in southwest China karst region of the southern zone, is a tributary of the Pearl River of Yujiang, drainage area 20 160 km2, belonging to subtropical monsoon climate zone, the area widespread carbonate rocks, karst landforms total drainage area of 66%, and broken terrain. Transitional and volatility of the natural environment, so that the region has typical subtropical karst characteristics, environmental variation is highly sensitive environmental capacity is low, poor stability. For a long time, due to unreasonable human resources development activities of ecological environment has resulted in serious environmental degradation. GIS and RS technology in support of the urgent need to develop environmental information management system to enhance the ecological environment of information management, monitoring and analysis for the realization of the left river basin environment and socio-economic sustainable development an important basis for decision support.The study includes:(1) Based on geographical data and environmental data such as the ecological basis of the data, following the security, integrity, consistency and robustness of the principles of ecological-oriented environmental research and ecological environment construction needs, build a multi-topic, consisting of multiple forms of data, information database environment.(2)Using C / S system structure, object-oriented computer programming methods and components of GIS development technology to the ecological environment as the core database, coupled eco-environmental quality evaluation and analysis models, design and development of environmental information collected massive collection , processing, query, analysis, evaluation and results of the output of digital functions in one of the left river basin environmental information management system for the left river basin development and planning of eco-environmental health to provide technical support and scientific services.(3) A comprehensive and regional basis the principle of combining, through the left river basin ecological quality assessment of the restrictive factors or dominant factor in the identification, construction of left River Basin environmental quality evaluation index system. Through the analytic hierarchy (AHP) weight factor for the establishment of environmental quality left River Basin assessment model, in order to develop eco-environmental quality evaluation module and the ecological environment evolution module.(4) Evaluation of the grid as the basic unit for index data standardization, application of eco-environmental quality assessment sub-module were calculated in 1990 and 2008 left River Basin environment index, and status were analyzed. Sub-module through the evolution of ecological environment, from the perspective of space and time analysis of the double draw left the last 20 years environmental quality of the River Basin Dynamics.

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CLC: > Environmental science, safety science > Environmental Quality Assessment and Environmental Monitoring > Analysis and Evaluation of Environmental Quality > Biological assessment, ecological assessment
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