Deng Fangping, Kang Lili, Jiang Yujun, et al. An hourly standard ice thickness model using conventional meteorological data with its validation. J Appl Meteor Sci, 2017, 28(2): 142-156. DOI:  10.11898/1001-7313.20170202.
Citation: Deng Fangping, Kang Lili, Jiang Yujun, et al. An hourly standard ice thickness model using conventional meteorological data with its validation. J Appl Meteor Sci, 2017, 28(2): 142-156. DOI:  10.11898/1001-7313.20170202.

An Hourly Standard Ice Thickness Model Using Conventional Meteorological Data with Its Validation

DOI: 10.11898/1001-7313.20170202
  • Received Date: 2016-09-09
  • Rev Recd Date: 2016-11-04
  • Publish Date: 2017-03-31
  • The effective monitoring and early warning of ice on transmission lines are required to guarantee the reliable operation of power grid. However, due to the sparse coverage of wire icing observation stations, the regional ice loads can hardly be characterized by in-situ measurements. To solve this problem, an hourly standard ice thickness model using conventional meteorological data has been developed. In this model, the evolution of icing event is divided into different phases, namely accretion phase, persistence phase and shedding phase. During accretion phase, the ice weight increases by glaze and rime-ice accreting on power lines. During persistence phase, there is no change of ice weight. And in the phase of shedding, the ice weight decreases due to melting or sublimation. Each icing event includes at least an accretion phase and a shedding phase, and may also include other accretion, persistence and shedding phases.The simulation consists of three steps. The phase of icing event and the type of ice accretion (or shedding) is determined by hourly meteorological data. According to identified results, the variation of ice weight in the current hour is estimated using different methods:The variation is zero in the phase of persistence; the glaze and rime ice accretion is respectively simulated by adjusting Jones' simple model and Mackinnon model; the melting and sublimation ice is estimated using experimental equations presented by Farzaneh et al. The varied weight of current hour is summed with the ice weight of the previous hour to get the ice thickness of current hour.Using hourly meteorological data from more than 2000 stations located in Zhejiang and neighboring provinces, along with NCEP FNL analysis data, the model is employed to estimate the hourly standard ice thickness with 0.01°×0.01° spatial resolution in Zhejiang Province during periods from 11 Jan to 20 Feb in 2008, and from 11 Jan to 10 Jan in 2013. Furthermore, it is evaluated and validated by the power system fault data, survey data of damaged transmission lines, wire icing observation, and the in-situ wire tension measurements. Results indicate that the model can well capture the influence of weather on icing events, and also well characterize the spatial distribution and the temporal variation of wire icing events. At the wire tension monitoring sites, the simulated hourly standard ice thickness is generally in agreement with measured values, with determination coefficient of 0.5209-0.9287(with a mean value of 0.8093), and root mean square error of 0.1-2.4 mm (with a mean value of 0.8 mm).
  • Fig. 1  The structure flowchart of the Hourly Standard Ice Thickness Model

    Fig. 2  The flowchart for discriminating phases of icing process

    Fig. 3  Hourly standard ice thickness over Zhejiang Province from mid-Jan to early-Feb in 2008

    (a)2300 BT 12 Jan 2008, (b)2300 BT 17 Jan 2008, (c)1100 BT 23 Jan 2008, (d)1100 BT 26 Jan 2008, (e)1100 BT 30 Jan 2008, (f)1100 BT 02 Feb 2008, (g)1100 BT 03 Feb 2008, (h)2300 BT 05 Feb 2008

    Fig. 4  Hourly standard ice thickness over Zhejiang Province in the first ten-day period of Jan in 2013

    (a)2300 BT 02 Jan 2013, (b)1100 BT 05 Jan 2013, (c)1100 BT 06 Jan 2013, (d)1100 BT 07 Jan 2013, (e)1100 BT 08 Jan 2013, (f)1700 BT 10 Jan 2013

    Fig. 5  The maximum standard ice thickness from model and sites of collapsed lines with measured standard ice thickness during ice accidents of Zhejiang Province in 2008(a) and 2013(b)

    Fig. 6  A scatter gram of the measured maximum standard ice thickness against simulated values at the icing accident sites in 2008(a) and 2013(b)

    Fig. 7  The measured and simulated hourly standard ice thickness at wire tension monitoring sites from 1 Jan to 10 Jan in 2013

    (a)11M00000000714220, (b)11M00000000715632, (c)11M00000001241605, (d)11M00000001297168, (e)11M00000003114326, (f)11M00000003261116, (g)11M00001617765804, (h)11M00001621741047

    Table  1  Location of wire icing observation stations

    序号 站名 纬度 经度 海拔/m
    1 湖州 30.87°N 120.05°E 4.1
    2 杭州 30.23°N 120.17°E 43.2
    3 定海 30.04°N 122.11°E 35.7
    4 金华 29.12°N 119.65°E 64.7
    5 鄞州 29.78°N 121.55°E 6.0
    6 仙居 28.85°N 120.72°E 52.0
    7 临海 28.87°N 121.20°E 6.6
    8 洪家 28.62°N 121.42°E 2.2
    DownLoad: Download CSV

    Table  2  Location of wire tension monitoring sites

    序号 观测点编号 纬度 经度 海拔/m
    1 11M00000000711808 29.364°N 120.556°E 279.1
    2 11M00000000712678 28.990°N 119.719°E 194.6
    3 11M00000000712687 28.957°N 119.738°E 305.9
    4 11M00000000714220 28.723°N 119.851°E 776.8
    5 11M00000000715333 29.236°N 120.103°E 283.4
    6 11M00000000715390 29.236°N 120.104°E 272.4
    7 11M00000000715551 29.108°N 120.088°E 635.1
    8 11M00000000715558 29.084°N 120.078°E 501.1
    9 11M00000000715618 29.124°N 120.055°E 476.5
    10 11M00000000715629 29.086°N 120.054°E 415.3
    11 11M00000000715632 29.071°N 120.068°E 597.7
    12 11M00000001241605 27.866°N 119.439°E 517.1
    13 11M00000001243837 28.767°N 120.347°E 1021.5
    14 11M00000001243985 28.437°N 119.172°E 857.4
    15 11M00000001245255 28.387°N 120.070°E 665.5
    16 11M00000001294705 28.780°N 118.817°E 274.5
    17 11M00000001297168 28.794°N 118.830°E 334.9
    18 11M00000001298444 29.000°N 118.397°E 331.7
    19 11M00000001299096 28.746°N 118.567°E 249.2
    20 11M00000001300907 28.945°N 119.156°E 327.7
    21 11M00000003114326 28.946°N 121.343°E 564.7
    22 11M00000003261116 29.395°N 120.429°E 604.5
    23 11M00001602707996 28.058°N 120.375°E 599.3
    24 11M00001602721894 28.057°N 120.392°E 669.6
    25 11M00001617765804 28.218°N 120.235°E 400.5
    26 11M00001617765912 28.311°N 120.220°E 213.1
    27 11M00001621741047 29.069°N 121.419°E 337.7
    DownLoad: Download CSV

    Table  3  Comparisons between simulation and observation of daily standard ice thickness at wire icing observation stations

    年份 站名 最大观测
    值/mm
    最大模拟
    值/mm
    观测均方
    差/mm
    模拟均方
    差/mm
    平均绝对偏
    差/mm
    积冰天气
    2008年 湖州 0.00 2.39 0.00 0.61 0.54 雨凇,雨夹雪
    杭州 0.45 0.45 0.08 0.10 0.07 雨凇,雨夹雪
    定海 0.00 0.16 0.00 0.04 0.01 雨夹雪
    金华 4.63 3.99 1.02 0.97 0.47 雨凇,雨夹雪
    鄞州 0.00 0.82 0.00 0.25 0.15 雨夹雪
    仙居 微量 0.37 0.00 0.13 0.04 雨凇,雨夹雪
    临海 0.96 0.95 0.17 0.24 0.06 雨凇,雨夹雪
    洪家 微量 0.08 0.00 0.02 0.01 雨凇,雨夹雪
    2013年 湖州 0.00 0.92 0.00 0.30 0.32 雨夹雪
    杭州 0.00 1.21 0.00 0.40 0.30 雨夹雪
    定海 0.00 0.01 0.00 0.02 0.00
    金华 0.00 1.57 0.00 0.58 0.51 雨夹雪
    鄞州 0.00 0.98 0.00 0.33 0.23 雨夹雪
    仙居 0.00 0.83 0.00 0.29 0.16 雨夹雪
    临海 0.00 0.28 0.00 0.11 0.06
    洪家 0.00 0.09 0.00 0.04 0.02
     注:2008年各站样本量为31,2013年各站样本量为10。
    DownLoad: Download CSV

    Table  4  Statistical analysis of measured and simulated hourly standard ice thickness

    观测点编号 最大观测
    值/mm
    最大模拟
    值/mm
    观测均
    方差/mm
    模拟均
    方差/mm
    决定
    系数
    均方根
    误差/mm
    11M00000000711808 3.70 4.00 1.21 1.54 0.7356 0.63
    11M00000000712678 4.10 4.60 1.13 1.26 0.9287 0.30
    11M00000000712687 5.60 4.90 1.87 1.44 0.9042 0.58
    11M00000000714220 7.20 8.90 2.66 3.29 0.8945 0.86
    11M00000000715333 5.40 4.10 1.78 1.21 0.8118 0.78
    11M00000000715390 5.50 4.10 1.87 1.21 0.7650 0.91
    11M00000000715551 10.40 8.00 3.53 2.83 0.5422 2.40
    11M00000000715558 8.40 7.60 3.12 2.30 0.8524 1.20
    11M00000000715618 7.60 7.00 2.79 2.13 0.8595 1.05
    11M00000000715629 7.60 7.10 2.99 2.20 0.8634 1.11
    11M00000000715632 10.70 8.40 4.27 2.96 0.8340 1.69
    11M00000001241605 2.30 2.30 0.57 0.47 0.8815 0.20
    11M00000001243837 9.50 10.20 3.26 3.83 0.8704 1.18
    11M00000001243985 8.60 6.70 3.19 2.56 0.8765 1.12
    11M00000001245255 7.30 5.20 2.52 1.57 0.5209 1.75
    11M00000001294705 5.10 5.20 1.51 1.61 0.8939 0.49
    11M00000001297168 4.50 5.70 1.49 1.95 0.5384 1.01
    11M00000001298444 4.40 3.80 1.23 1.02 0.6974 0.68
    11M00000001299096 5.60 5.00 1.82 1.57 0.9010 0.57
    11M00000001300907 5.70 5.20 1.83 1.49 0.5823 1.19
    11M00000003114326 7.20 5.80 2.12 1.77 0.9003 0.67
    11M00000003261116 7.10 6.60 2.43 2.37 0.8850 0.83
    11M00001602707996 3.70 2.50 0.72 0.59 0.7207 0.38
    11M00001602721894 3.10 2.50 0.70 0.55 0.9001 0.22
    11M00001617765804 2.90 2.40 0.87 0.69 0.9103 0.26
    11M00001617765912 0.90 1.10 0.19 0.23 0.88857 0.10
    11M00001621741047 6.20 5.60 1.33 1.63 0.8935 0.43
     注:各站样本量均为240。
    DownLoad: Download CSV
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    • Received : 2016-09-09
    • Accepted : 2016-11-04
    • Published : 2017-03-31

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