Characteristics of Icing Day in Jiangxi Province and Calculation of Maximum Standard Ice Thickness of Icing Wire at Different Return Periods for Heavy Icing Area
Based on the glaze and rime observation records of 85 national meteorological stations in Jiangxi Province over the past 30 years,the interannual and interdecadal variations and distribution characteristics of icing days in Jiangxi Province,as well as the spatial and temporal distribution characteristics of the extreme value of wire icing thickness,were analyzed.Results show that the icing events in Jiangxi have the characteristics of decreasing frequency and increasing intensity in the past 30 years.The occurrence frequency of icing events in alpine meteorological stations is significantly higher than that in plain and hilly meteorological stations.The high-incidence areas of icing are mainly distributed in the western and northern mountainous areas and the central area around the Poyang Lake and the south of the Fuhe River Basin.In addition,Fully consider the change of observation wire diameter of meteorological department before and after 2011,The maximum standard thickness of wire ice is calculated by using the data of 16 observation stations,and the results are more in line with the demand of electric power industry for meteorological data of wire ice.The results show that the maximum standard ice thickness of wire icing on 2 m height is less than 20mm in most parts of the province except the mountainous areas in northern,and there are many"light icing area".Attention should be paid to the damage caused by the wire icing in the mountainous areas and to the precaution of them.For the practical need of the area overhead power transmission line design,the extreme value Ⅰ-type distribution function combine with Lushan mountain observation data were used to calculate the thickness of standard ice for icing wires,the maximum standard ice thickness on 20 m height by once-in-a-century is 71.1 mm,and the proportional coefficient between the windward and unwind ward is about 1.2.The above results can provide strong support for the planning and design of ice disaster prevention in Jiangxi"heavy icing area",can helps to find a balance point between saving project construction cost and scientifically preventing meteorological disaster to provide meteorological guarantee.
icing daywire icingheavy icing areathickness of standard ice
国家科技期刊平台
NSTL
万方数据
