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一、蒿子坪山崩与泥石流的形成 (一)蒿子坪的自然地理概况 蒿子坪位于长江三峡牛口段的北岸。地质构造上位于秭归向斜的西南面。由侏罗系砂岩与页岩组成。大部山坡的坡度为35°,部分悬崖与陡坡的坡度>60°。蒿子坪的西面与东面分别发育有上溪沟和下溪沟。前者流域面积18.6平方公里,河床比降14％;后者流域面积为11.4平方公里,河床比降26％。蒿子坪所在的中山山地(海拔650米),地面平均坡度(8°)相对较缓,当地居民称为坪。东、西、南三面,受上、下两溪沟及其支流的深切,形成了陡崖和陡坡。在上、下溪沟的沟口,因推移质泥沙的堆积形成了冲积扇,当地居民称为溪口碛。
First, the Artemisia Ping landslides and the formation of debris flow (a) Artemisia Ping natural geography overview Artemisia Ping is located in the northern bank of the Three Gorges Niukou section of the Yangtze River. Geological structure is located in the southwest of Zigui syncline. By the Jurassic sandstone and shale composition. Most of the slopes of the slope of 35 °, some cliffs and steep slopes> 60 °. Artemisia sub-Ping west and east were developed on the Creek Creek and Creek Creek. The former watershed area of 18.6 square kilometers, the river bed down 14%; the latter basin area of 11.4 square kilometers, 26% drop river bed. Artemisia Ping where the mountain (650 meters above sea level), the average gradient of the ground (8 °) is relatively slow, the local residents called Ping. East, West, South on three sides, by the upper and lower Liangxi and its tributaries of deep, forming a steep cliff and steep slopes. In the upper and lower gully Mizoguchi, alluvial fan formed due to the accumulation of sediment deposition, local residents called Xikou moraine.