| There are rich hydropower resources in western China, but it is very difficult to be taken out because of the complicated geological conditions. How to design the transmission line legitimately becomes the primary subject of power system engineering. In this article, taking the Wenchuan earthquake reconstruction project which is called"500kV Mianyang-Guangyuan lineπconnected into Nanba line project"as the research object, according to the great changes of engineering geological conditions and environmental geological conditions in research area after the earthquake, using remote sensing technology quickly extracting the information of topography, lithology, geological structure, land using and bad geological conditions and other characteristics, supplemented by the meteorological hydrology and socio-economic conditions of the selected area, constructing the suitability evaluation system of power transmission line. According to experts'experiences, the form of fuzzy weighted semi-quantitatively is applied to evaluate the suitability of the research area through the powerful spatial analysis function of GIS. According to the assessment, three primary programs are prepared. They are east line, central line and west line. After the comparison of the engineering geological conditions of 3 lines, the west line comes to be the best solution. In the end, the west line is divided by the conditions of engineering geologic and evaluating suitability for each area. The article mainly achieved the following results:(1) Getting data by remote sensing.In view of the large research area, and the great changes of the environmental geology, especially landscape conditions on the ground of earthquake, the part of the original drawings have lost value. Although the information could be obtained through field research, which is reliability, usually it requires substantial investment and long time, which would delay the process of reconstruction. This article constructs to get the information for the assessment of the suitability of the line by remote sensing through the interpret signs. According to the suspicious interpret signs, taking the field research on purpose, the efficiency are improved under the premise of ensuring the accuracy of the data.(2) Establish the line suitability assessment system based on GIS preliminarily. In this article, the line suitability assessment system includes 2 parts: evaluation index system and evaluation method model. The evaluation index system is generally considered engineering geology, environmental geology, meteorological hydrology, geological structures and local socio-economic factors, including 8 indicator data. According to which gives a comprehensive introduction on the suitability of the construction program in the research area. Because of the low work lever of the research area and incomplete data, it is very difficult to evaluate quantitative comprehensively. Therefore, according to experts'experiences, the form of fuzzy weighted semi-quantitatively is utilized to evaluate with GIS platform. The result shows that the method is strongly operational; it could be considered as an important technical support in line location evaluation project.(3) Line selection and evaluation division.In the 3 initial line options, according to the secondary score of the evaluation system, the west line is the best in suitability so that the selection of the lines is based on the west line project. Through analyzing the topography, geological structure, lithology, land using and bad geological conditions, the best line alignment is finalized. The location of the tower point is determined with the establishment of three-dimensional scene. According to the engineering geological conditions, 4 districts which are Dakang-Ganxi, Ganxi-Pingtong, Pingtong-Tianba and Tianba-Nanba, are divided. The evaluation of bad geological phenomenon suitability and engineering geological suitability for each area are given. |
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