摘要
通过对1991—2001年四川盆地泥石流滑坡的时空分布特征与气象条件分析,得出了一些有益的认识,为泥石流滑坡预警预报提供了参考依据。(1)四川盆地泥石流滑坡主要发生在6~8月,以7月份为最多,多发区在四川盆地西南部,其次是四川盆地中、东部;岷江下游、沱江上中游是无泥石流滑坡区;在5~8月,有逐月从四川盆地东南部向西北推进到盆地西北部的趋势。(2)四川盆地泥石流、滑坡的气象成因是四川盆地多暴雨,为多发泥石流滑坡提供了充足的水源条件;四川盆地西北、西南部在大暴雨情况下,盆地西南、中东部在大雨、暴雨情况下发生泥石流滑坡的可能性大;在不同地质、地貌条件下,不同等级降水诱发泥石流滑坡的可能性还与前期的降水情况有关。反映了强降水对诱发泥石流滑坡的重要作用。
By analyzing the spatialtimporal charateristics of the mudrock flow and landslip in Sichuan basin during the period of 1999—2001 and its meteorological cause, the some useful results were obtained from it, which provided a reference for forcasting and warning landslip in advance. The results are as follows: (1) The spatialtemporal characteristics of the mudrock flow and lanslip in Sichuan basin are to mainly occurs in June~August, mostly in July; frequentlyoccurring areas of the mudrock flow and landslip located in southwesten Sichuan basin and then the middleeastern; no landslip occurs in the lower reach of Ming river and the middle and upper reaches of Tuo river, but there is a trend that the location of the landslip monthly moves from southwester to northwestern Sichuan basin in May~August. (2) So many landslip occurs in Sichuan basin is due to the meteorological reason, namely, the rain areas provide abundant water for it. (3) There is a great possibility with mudrock flow and landslip occurring if it is a sever heavy rain there, only a heavy rain or even just a rainfall with over 30 mm may trigger landslip in the southwester and middleeastern Sichuan basin. (4) Besides the mudrock flow and landslip related to the intensity of rain, geology and geomorphology, and it is also relevant with the precedingrainfall.
出处
《高原气象》
CSCD
北大核心
2003年第B10期83-89,共7页
Plateau Meteorology
基金
中国气象局成都高原气象研究所高原气象开放实验室基金
科技部社会公益专项资金项目(2001DIB20106)
四川省重点科技项目(01SG049 03)资助
关键词
四川盆地
泥石流滑坡
气象成因
暴雨
Sichuan Basin
Mud-rock flow landslip
Meteorological cause
Heavy rain