【摘要】 现代泥石流是当前渭河盆地极其重要的山地灾害之一。据史料记载,从公元前18年至1982年的两千年间,渭河盆地内发生灾害性泥石流53次以上,仅盆地南部典型的灾害性泥石流沟谷就有25条之多。在空间分布上,泥石流具有三种类型:盆地南部的水石质泥石流;盆地中部的黄土泥质泥石流及盆地北部的泥石质泥石流,其中以盆地南部的水石质泥石流活动最为显著。在时间进程上,泥石流具有周期性的活动特征,并以具有长短不同的活动周期的特点,并且其周期序列与地震活动、太阳黑子活动等因素有关。更多还原

【Abstract】 Based on the historic records and site investigation, it is concluded in the paper that: 1. Debris flow is one of serious mountain hazards in Weihe Basin. The catastrophic debris flows occured for more than 53 times during two thousand years, ranging from 1800B. C. to 1982 A. D., only in the south of Weihe Basin there are 25 typical catastrophic gullies; 2. According to the space distribution and the catastrophics the debris flows can be classified into three types as following, 1) The water-rock flows in the south of the basin; 2) The mud-rock flows in the north of the basin; 3) The loess mud flows in the middle of the basin. Among them, the south is characterized by the repeated appearence and remarkable calamity and is a zone where the distribution of debris flows were concentrated. Alone the zone, its distribution density and appearence freqency become lower and lower gradually from east to west. 3. In time seqence, debris flows are characterized by the remarkable periodic activity. The active period has two types——the long period for 220 years and the short period for 60 years and 24 years on the average. The former may be controlled by seismisity, the latter has a striking corralation with sunsports period and is corresponding to the main theoretical periods of so-called 2^1/2sequence and Gan-Zhi sequence as well as its ratio of periods accords with the gold section number.更多还原