دانلود رایگان پاورپوینت رانش زمین در کوه Bear Lodge (انگلیسی)

Landslides in the Bear LodgeMountains
Overall Distribution of Landslides in the Bear Lodge Mountains
Cook lake view showing the camping loops.
Cook Lake Landslide
Key Features of the Cook Lake Slide
Grand Mesa, Colorado
Houston Creek Area

Key Features of the Cook Lake Slide
Water and gravity are the key motivators. Most of the slopes in the area have 200 to 400 ft. of vertical development from adjacent valley floors. Many side slopes have perched water tables and contain ponds that keep the slopes moist through much of the year. The Cook Lake Slide system has almost 360 ft. of vertical relief.
The rocks beneath the landslide dip towards the lake at 5 to 5-10° . They are composed of slide prone Morrison Formation silts/shales and Redwater Shales, which are overlain by cliffs of Lakota Formation sandstones and siltstones.
The rock strength of the Morrison Formation is low enough that it often fails under its own weight when lying at a mere 5-7° slope. This suggests its angle of internal friction is very low. The dip of these units is already at a 5-7° angle, and they slope into the lake basin.
The lakeside slide covers an area of 30.45 acres, and is up to 320 ft. thick at the head scarp end.