ZHANG Shan,YANG Shuwen,WANG Hengliang.Spatiotemporal Variation of Rainfall for Different Categories in Lanzhou During 1965-2015 Considering Loess Landslide[J].Research of Soil and Water Conservation,2019,26(01):184-191.
顾及黄土滑坡的兰州市不同等级降雨时空变化特征
- Title:
- Spatiotemporal Variation of Rainfall for Different Categories in Lanzhou During 1965-2015 Considering Loess Landslide
- 关键词:
- 黄土滑坡; 降雨等级; Mann-Kendall突变性检验; 滑动t检验; Morlet小波变换
- Keywords:
- loess landslide; rainfall categories; Mann-Kendall test; moving t-test; Morlet wavelet transformation
- 分类号:
- P626.61
- 摘要:
- 降雨是诱发黄土滑坡的关键因子，不同等级的降雨及其时空分布特征影响和制约了降雨型黄土滑坡的发生和发展。利用兰州市1965-2015年逐日降水资料，采用Mann-Kendall突变性检验、滑动t检验、Morlet小波变换等方法分析了不同等级降雨事件的降雨量、降雨日数和贡献率，以得到其突变性、趋势性、周期性和空间分布特征，从而为突发性滑坡研究提供数据支持。结果表明：兰州市以微雨、小雨和中雨事件为主，在时间尺度上，降雨量和降雨日数均具有突变性，且突变时间各异；近50年来各等级降雨日数、降雨量存在着明显的周期性震荡，变化周期均以8 a为主，该区未来几年都将处于降雨充沛期；年降雨量整体下降，其气候倾向率为-4.96 mm/10 a。在空间分布上，年降雨日数呈现"两多一少"的规律，降雨量则为"两少一多"，不同等级降雨事件对不同地区降雨的影响程度不同；与黄土滑坡分布浅析可知降雨对诱发兰州市滑坡起到了重要的作用。
- Abstract:
- Rainfall is the key factor causing the disaster of loess landslide. Rainfall for different categories and its spatiotemporal variation affected the occurrence and development of loess landslides. Based on daily precipitation data from 1965 to 2015 of Lanzhou, we analyzed rainfall for different categories including rain days, precipitation and precipitation contribution rate, used Mann-Kendall test, moving t-test and Morlet wavelet transformation to get its abrupt change, trend, periodicity and spatial distribution in the study. It provided data support for research on loess landslide paroxysmal disaster. The results indicated that the rainfall events were characterized as light drizzle, light rain and moderate rain in Lanzhou; and the rainfall and the number of rainfall days were all abrupt, and the mutation time is different. The overall annual rainfall was on the rise, consistent with the trend of moderate rainfall. In the past 50 years, there were obvious multi-time-scale periodic oscillations of rainfall; and the variation period of the number of rainfall days was 8-year, and the next few years would be abundant rainfall. The annual rainfall declined overall, and its climate tendency was -4.96 mm/decade. In the spatial distribution, the number of annual rainfall days showed ‘two more and two less’, and precipitation showed ‘two less and two more’, and the degree of rain events of different grades had different impacts on rainfall in different areas. Analysis on the rainfall and loess landslide showed that rainfall played an important role in inducing landslide in Lanzhou.
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备注/Memo
收稿日期:2017-9-14;改回日期:2018-3-15。
基金项目:国家重点研发计划项目（2017YFB0504201）；兰州市人才创新创业项目（2015-RC-28）；甘肃省科技计划资助项目（1506RJZA070）
作者简介:张珊(1992-),女,甘肃兰州人,硕士生,主要研究方向为地理信息系统应用。E-mail:shanshan_rs@foxmail.com
通讯作者:杨树文(1975-),男,甘肃靖远人,博士,教授,主要研究方向为遥感数字图像处理及信息自动提取、灾害遥感。E-mail:8251998827@qq.com