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Water Enviorment Evaluation and the System Construction Study of Evaluation System on the Basis of GIS,ANN

Author: YuMingYang
Tutor: ZhangZuLu
School: Shandong Normal University
Course: Physical Geography
Keywords: Nansi Lake basin Water Environmental Assessment Neural Networks LMBP
CLC: X824
Type: Master's thesis
Year: 2005
Downloads: 365
Quote: 0
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Abstract


Nansi Lake in Shandong Province, southwest junction of Jiangsu Province, one of China's ten freshwater lakes throughout the watershed a total of 53 big and small rivers, of which a dozen major rivers, is an important water source in Shandong Province. With the rapid development of economic construction, the increasing demand of water resources, water resources in the basin has become an important factor affecting the sustainable development of the region. In the development of coal resources and the development and utilization of water resources of the region has generated lurking such as water tables are falling, land subsidence, water pollution has become increasingly serious environmental problems caused due to insufficient water resources, including of Nansi water pollution problems are more prominent more pollution into the Hukou at the old canal, moat river, benthic animals have disappeared all died, aquatic plants, these conditions are a major constraint to sustainable development of the region's energy base construction and regional economic impact. Therefore, Nansi Lake reasonable, comprehensive evaluation of water environment has become essential for the governance and decision-making. This thesis mentor participation - Russia (Belarus) cooperation project Jining City, Shandong Province, water resources management decision support system to build a key part of the study, the author LMBP neural network algorithm Nansi Lake basin water environment build the overall evaluation and comparison of calculation and analysis of the water environment, on the basis of previous studies, the use of advanced GIS technology to build a complete evaluation system, the ability to express and GIS spatial analysis function, so that the management of the river basin the overall situation and trends of water quality at a glance, for different years and different monitoring sections, menu operation, can be obtained from the back-end database monitoring water quality values ??derived by the model in the model library automatically calculated evaluation value, and in the electronic map displayed directly on the water quality evaluation and visualization of GIS, spatial analysis, and automatically calculates the seamless integration of functionality, greatly improving the efficiency of the entire watershed and water quality evaluation, the great convenience sector supporting decision-making, the management of water resources and water environment to a higher level. Thesis research content, method and conclusions: First, the paper on the basis of the previous study of Nansi, according to the specific circumstances of the watershed pollution appropriate choice of water quality evaluation and the evaluation model analysis and evaluation of the study area for the entire watershed water quality evaluation system developed to provide a theoretical basis. On water quality assessment using various methods, as well as the mathematical model used by the current water quality assessment, and to compare these models, clear understanding of their strengths and weaknesses, and focuses on BP (forward-propagation neural network) on LMBP

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CLC: > Environmental science, safety science > Environmental Quality Assessment and Environmental Monitoring > Analysis and Evaluation of Environmental Quality > Water Quality Assessment
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