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秦岭山脉东起河南,横穿陕西,西至甘肃,长约300公里,宽约100—120公里,属土石山区。由于地质构造特殊,岩石破碎,土质疏松,大断层多,自古就有“山崩堵江”、“地移掩村”的历史记载和“蛟龙出山”的离奇传说。这些记载与传说的事实,就是我们现在所谓的泻溜、滑坡、崩塌、走山等重力侵蚀和泥石流灾害。古时的泥石流我们没有体会。1981年秋的泥石流,仅略阳、宁强、勉县、留坝、凤县、太白等六县统计,发生2.5万多处,大者流走土石几百万立方米,小者也有数万立方米,其危害之大,情景之惨,真是令人目不忍睹。
Qinling Mountains east of Henan, across Shaanxi, west of Gansu, about 300 km, a width of 100-120 km, is a rock mountain. Due to its special geological structure, broken rocks, loose soil and large faults, there have been historical records of “landslide blocking and river blocking” and “shifting villages” and the bizarre legend of “dragons and mountains”. The fact that these records and legends are what we now call gravity erosion and debris flow disaster such as diarrhea, landslide, landslide and mountain climbing. The mudslides in ancient times we did not understand. Debris flow in autumn 1981, only Lueyang, Ningqiang, Mianxian, stay dam, Fengxian, Taibai and other six counties statistics, occurred more than 25,000, the large flow of millions of cubic meters of earth and rocks, the smaller also have tens of thousands of cubic meters M, its great harm, the scene of the tragedy, it is really appalling.