Complex topography along with unevenly distributed precipitation and changes in climate pattern make mountainous regions railway in China vulnerable to water-related geological hazards and rainfall-induced floods. This study investigates the impact of global warming on the safe operation of railways by analyzing the spatial and temporal variations of precipitation, changes in precipitation level distributions, and variations in the threshold hours for rainfall alert levels. The findings are as follows: (1) In recent years, there has been a significant decrease in annual precipitation in southern Jiangnan and south China, while there has been a significant increase in precipitation in the eastern parts of northwest and the northeastern parts of southwest. Management Areas of Guangzhou, Nanchang and Nanning Railway Bureaus have the highest annual precipitation which shows a decreasing trend, while areas of Zhengzhou, Jinan, and Xi'an Bureaus show an increasing trend in annual precipitation. The strong East Asian summer monsoon and the northward shift of the subtropical high are the main causes of precipitation changes. (2) Shenyang Bureau shows the most significant increase in precipitation intensity, while Nanning Bureau shows the most significant decrease. The changes in precipitation intensity are mainly related to variations in typhoons and short-duration heavy rainfall. (3) From the perspective of precipitation level distribution, in the past five years there has been a decrease in the frequency of heavy precipitation occurrence in bureaus such as Urumqi and Lanzhou in the northwest region, while there has been an increase in the frequency of heavy precipitation occurrence in bureaus such as Nanchang and Chengdu in the southwest to Jiangnan region. (4) Guangdong, Hainan, the eastern parts of the southwest region, and the northeastern parts of North China to the southeastern parts of Northeast China are the three high-value areas for railway alert hours due to precipitation. The high-value area for speed restriction hours has narrowed down to the eastern parts of the southwest region, and the high-value area for closure hours has further narrowed down. Overall, under the background of climate change, there has been a significant decrease in precipitation in southern Jiangnan and South China, leading to a reduction in rainfall hours and railway patrol hours, a slight decrease in speed restriction hours, and a decrease in the alert pressure for railway precipitation control. On the other hand, there has been a significant increase in railway patrol hours in the eastern parts of the southwest region to the northeastern parts of Northeast China, with a noticeable increase in speed restriction and closure hours in the eastern parts of the southwest region. This has resulted in an enhancement of alert pressure for railway precipitation control, with Chengdu Bureau showing a significant increase in patrol hours, speed restriction hours, and closure hours.
JIANG Ying
,
CHEN Zhongyu
,
ZHANG Xiaomei
,
WANG Yuhong
,
GAO Jingjing
,
HU Ruoyu
,
ZHANG Hui
,
WU Hao
. Impact of precipitation changes on the safety of railway operations in China under global warming[J]. Science & Technology Review, 2023
, 41(21)
: 58
-68
.
DOI: 10.3981/j.issn.1000-7857.2023.21.006
[1] Bubeck P, Dillenardt L, Alfieri L, et al. Global warming to increase flood risk on European railways[J]. Climatic Change, 2019, 155: 19-36.
[2] Jaiswal P, Westen C J, Jetten V. Quantitative assessment of landslide hazard along transportation lines using historical records[J]. Landslides, 2011, 8: 279-291.
[3] 徐雨晴, 何吉成. 1951—1996年中国铁路泥石流灾害的时空特征[J]. 水土保持通报, 2016, 36(1): 337-342.
[4] 徐雨晴, 何吉成. 1951—1998年强降雨诱发的中国铁路洪水灾害分析[J]. 气候变化研究进展, 2012, 8(1): 22-27.
[5] Zhang J P, Zhao T B, Zhou L B, et al. Historical changes and future projections of extreme temperature and precipitation along the Sichuan-Tibet railway[J]. Journal of Meteorological Research, 2021, 35(3): 402-415.
[6] 中国铁路总公司 . 铁路防洪工作管理办法(铁总运〔2017〕8 号)[EB/OL].(2021-04-23)[2022-08-18]. http://www.guimei8.com/6352.html.
[7] 中国气象局 . 地面观测[M]. 北京: 气象出版社, 2003: 51-57.
[8] World Meteorological Organization (WMO). Guidelines on quality control procedures for data from automatic weather stations[EB/OL]. (2004-01-01) [2023-06-16]. http://www. researchgate. net/publication/228826920_Guidelines_on_Quality_Control_Procedures_for_Data_from_Automat-ic_Weather_Stations.
[9] Song F, Hu Q, Qian W H. Quality control of daily meteorological data in China, 1951-2000: A new dataset[J]. International Journal of Climatology, 2004, 24(7): 853-870.
[10] 中国国家铁路集团有限公司 .中国国家铁路集团有限公司组织机构情况[EB/OL]. (2017-12-31)[2023-07-20]. http://www.china-railway.com.cn/gsjs/zzjg.html.
[11] 交通百科网 . 全国 18 个铁路局有哪些[EB/OL]. (2018-04-29)[2023-08-20]. http://www.jiaotongbk.com/n8/863-51.html.
[12] 田付友, 郑永光, 毛冬艳, 等 . 基于 Γ 函数的暖季小时降水概率分布[J]. 气象, 2014: 787-795.
[13] Thom H C S. A note on the gamma distribution[J]. Monthly Weather Review, 1958, 86: 117-122.
[14] 丁一汇 . 中国气候: 第 1 版[M]. 北京: 科学出版社, 2013: 115-205.
[15] 郑国光 . 中国气候: 第 1 版[M]. 北京: 气象出版社, 2019: 54-61.
[16] 崔丹阳 . 东亚季风期极端降水事件与亚洲夏季风活动的关系[D]. 兰州: 兰州大学大气科学系, 2019.
[17] 高国栋, 陆渝蓉 . 气候学: 第 1 版[M]. 北京: 气象出版社, 1998: 222-248.
[18] Zhou X X, Ding Y H, Wang P X. Moisture transport in the Asian Summer Monsoon region and its relationship with summer precipitation in China[J]. Acta Meteorologica Sinica, 2010, 24(1): 31-42.
[19] Hu H B, Deng Y H, Fang J B. Mechanism of regional subseasonal precipitation in the strongest and weakest East Asian Summer Monsoon subseasonal variation years[J]. Journal of Ocean University of China, 2022, 21: 1411-1427.
[20] Zhang R H. Changes in East Asian summer monsoon and summer rainfall over eastern China during recent decades[J]. Science Bulletin, 2015, 60(13): 1222-1224.